EP2582827A2 - Methods and systems for removing undissolved solids prior to extractive fermentation in the production of butanol - Google Patents

Methods and systems for removing undissolved solids prior to extractive fermentation in the production of butanol

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Publication number
EP2582827A2
EP2582827A2 EP11727620.4A EP11727620A EP2582827A2 EP 2582827 A2 EP2582827 A2 EP 2582827A2 EP 11727620 A EP11727620 A EP 11727620A EP 2582827 A2 EP2582827 A2 EP 2582827A2
Authority
EP
European Patent Office
Prior art keywords
solids
feedstock
corn
butanol
undissolved solids
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11727620.4A
Other languages
German (de)
English (en)
French (fr)
Inventor
Brian Michael Roesch
Keith H. Burlew
John W. Hallam
David J. Lowe
Joseph J. Zaher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Butamax Advanced Biofuels LLC
Original Assignee
Butamax Advanced Biofuels LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US13/160,766 external-priority patent/US9012190B2/en
Application filed by Butamax Advanced Biofuels LLC filed Critical Butamax Advanced Biofuels LLC
Publication of EP2582827A2 publication Critical patent/EP2582827A2/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/38—Chemical stimulation of growth or activity by addition of chemical compounds which are not essential growth factors; Stimulation of growth by removal of a chemical compound
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
    • C07C29/86—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by liquid-liquid treatment
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/88—Lyases (4.)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
    • C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
    • C12P7/06—Ethanol, i.e. non-beverage
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
    • C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
    • C12P7/16—Butanols
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Y—ENZYMES
    • C12Y301/00—Hydrolases acting on ester bonds (3.1)
    • C12Y301/01—Carboxylic ester hydrolases (3.1.1)
    • C12Y301/01003—Triacylglycerol lipase (3.1.1.3)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B01D21/262—Separation of sediment aided by centrifugal force or centripetal force by using a centrifuge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel

Definitions

  • the present invention relates to processes and systems for removing undissolved solids from a fermentor feed stream in the production of fermentative alcohols such as butanol.
  • Butanol is an important industrial chemical with a variety of applications, including use as a fuel additive, as a feedstock chemical in the plastics industry, and as a food-grade extractant in the food and flavor industry. Accordingly, there is a high demand for butanol, as well as for efficient and environmentally friendly production methods.
  • ISPR In situ product removal
  • liquid-liquid extraction requires contact between the extractant and the fermentation broth for efficient mass transfer; phase separation of the extractant from the fermentation broth (during and after fermentation); and/or efficient recovery and recycle of the solvent and minimal degradation and/or contamination of the extractant over a long-term operation.
  • the present invention satisfies the above need and provides methods and systems for producing product alcohols such as butanol by decreasing the amount of undissolved solids that are fed to the fermentor.
  • the present invention relates to processes and systems for removing undissolved solids from a fermentor feed stream in the production of fermentative alcohols such as butanol.
  • the present invention is directed to a method comprising providing a biomass feedstock slurry comprising fermentable carbon source, undissolved solids, and water; separating at least a portion of the undissolved solids from said slurry whereby (i) an aqueous solution comprising fermentable carbon source and (ii) a wet cake co-product comprising solids are generated; and adding the aqueous solution to a fermentation broth comprising recombinant microorganisms in a fermentation vessel whereby a fermentative product is produced; wherein the biomass processing productivity is improved.
  • the improved biomass processing productivity comprises improved fermentative product and co-product recoverability relative to a fermentative product produced in the presence of undissolved solids.
  • the improved biomass processing productivity includes one or more of increased process stream recyclability, increased fermentor volume efficiency, and increased biomass feedstock load feeding.
  • the method further comprising contacting the fermentation broth with an extractant wherein the extractant has increased extraction efficiency relative to a fermentation broth comprising undissolved solids.
  • increased extraction efficiency includes one or more of stabilized partition coefficient of the extractant, enhanced phase separation of the extractant from the fermentation broth, enhanced liquid-liquid mass transfer coefficient, increased extractant recovery and recyclability, and preserved extractant for recovery and recycle.
  • the extractant is an organic extractant.
  • the extractant comprises one or more immiscible organic extractants selected from the group consisting of C 12 to C 22 fatty alcohols, C 12 to C 22 fatty acids, esters of C 12 to C 22 fatty acids, C 12 to C 22 fatty aldehydes, C 12 to C 22 fatty amides, and mixtures thereof.
  • the extractant comprises C 12 to C 22 fatty acids derived from corn oil.
  • the undissolved solids are separated from feedstock slurry by decanter bowl centrifugation, tricanter centrifugation, disk stack centrifugation, filtering centrifugation, decanter centrifugation, filtration, vacuum filtration, beltfilter, pressure filtration, filtration using a screen, screen separation, grating, porous grating, flotation, hydroclone, filter press, screwpress, gravity settler, vortex separator, or combination thereof.
  • the method further comprising the step of liquefying a feedstock to create a biomass feedstock slurry; wherein the feedstock is selected from corn grain, corn cobs, crop residues such as corn husks, corn stover, grasses, corn, wheat, rye, wheat straw, barley, barley straw, hay, rice straw, switchgrass, waste paper, sugar cane bagasse, sorghum, sugar cane, soy, components obtained from milling of grains, cellulosic material, lignocellulosic material, trees, branches, roots, leaves, wood chips, sawdust, shrubs and bushes, vegetables, fruits, flowers, animal manure, and mixtures thereof.
  • the feedstock is corn.
  • the feedstock is fractionated or unfractionated. In some embodiments, the feedstock is wet milled or dry milled. In some embodiments, the method further comprising the step of increasing the reaction temperature during liquefaction.
  • the feedstock slurry comprises oil from the feedstock and said oil is separated from the slurry.
  • the wet cake comprises feedstock oil. In some embodiments, the wet cake is washed with water to recover oligosaccharides present in the wet cake. In some embodiments, the recovered oligosaccharides are added to the fermentation vessel. In some embodiments, the wet cake is further processed to provide an improved co- product. In some embodiments, the co-product is further processed to form an animal feed product.
  • the wet cake is washed with solvent to recover oil present in the wet cake.
  • the solvent is selected from hexane, butanol, isobutanol, isohexane, ethanol, and petroleum distillates.
  • the fermentative product is a product alcohol selected from the group consisting of methanol, ethanol, propanol, butanol, pentanol, and isomers thereof.
  • the recombinant microorganism comprises an engineered butanol biosynthetic pathway.
  • the method further comprising at least partially vaporizing the fermentation broth and product and optionally C0 2 wherein a vapor stream is produced and recover the product from the vapor stream.
  • the method further comprises contacting the vapor stream with an absorption liquid phase wherein at least a portion of the vapor stream is absorbed into the absorption liquid phase; wherein the temperature of the onset of the absorption of the vapor stream into the absorption liquid phase is greater than the temperature of the onset of condensation of the vapor stream in the absence of the absorption liquid phase.
  • the vaporizing and contacting steps are carried out under vacuum conditions.
  • the separating a substantial portion of the undissolved solids from said slurry provides for a higher vapor pressure of the fermentation broth relative to a fermentation broth comprising undissolved solids.
  • the higher vapor pressure provides for more efficient vaporization product recovery.
  • the more efficient vaporization product recovery includes one or more of lower capital investment, smaller vaporization, absorption, compression, and refrigeration equipment, improved mass transfer rates, less energy for vaporization, and lower absorbent flow rate.
  • the present invention is also directed to method for producing butanol comprising providing a feedstock; liquefying the feedstock to create a feedstock slurry, wherein the feedstock slurry comprises oligosaccharides, oil, and undissolved solids; separating undissolved solids from the feedstock slurry to create (i) an aqueous solution comprising oligosaccharides, (ii) a wet cake comprising undissolved solids, and (iii) an oil phase; contacting the aqueous solution with a fermentation broth in a fermentor; fermenting the oligosaccharides in the fermentor to produce butanol; and performing in situ removal of the butanol from the fermentation broth as the butanol is produced, wherein removal of the undissolved solids from the feedstock slurry increases the efficiency of the butanol production.
  • the feedstock is corn and the oil is corn oil.
  • the undissolved solids comprise germ, fiber, and gluten.
  • the method further comprises dry milling the feedstock.
  • the corn is unfractionated.
  • the undissolved solids are separated by decanter bowl centrifugation, tricanter centrifugation, disk stack centrifugation, filtering centrifugation, decanter centrifugation, filtration, vacuum filtration, beltfilter, pressure filtration, filtration using a screen, screen separation, grating, porous grating, flotation, hydroclone, filter press, screwpress, gravity settler, vortex separator, or combination thereof.
  • the step of separating undissolved solids from the feedstock slurry comprises centrifuging the feedstock slurry.
  • centrifuging the feedstock slurry separates the feedstock into a first liquid phase comprising the aqueous solution, a solid phase comprising the wet cake, and a second liquid phase comprising the oil.
  • the wet cake is washed with water to recover oligosaccharides present in the wet cake.
  • the in situ removal comprises liquid-liquid extraction.
  • an extractant for the liquid-liquid extraction is an organic extractant.
  • saccharification of the oligosaccharides in the aqueous solution occurs simultaneously with fermenting the oligosaccharides in the fermentor.
  • the method further comprises the step of increasing the reaction temperature during liquefaction.
  • the method further comprises saccharifying the oligosaccharides prior to fermenting the oligosaccharides in the fermentor.
  • the step of removing undissolved solids from the feedstock slurry comprises centrifuging the feedstock slurry.
  • centrifuging the feedstock slurry occurs prior to saccharifying the sugar.
  • fermentation broth comprises a recombinant microorganism comprising a butanol biosynthetic pathway.
  • the butanol is isobutanol.
  • the step of removing undissolved solids from the feedstock slurry increases the efficiency of the butanol production by increasing a liquid-liquid mass transfer coefficient of the butanol from the fermentation broth to the extractant; increases the efficiency of the butanol production by increasing an extraction efficiency of the butanol with an extractant; increases the efficiency of the butanol production by increasing a rate of phase separation between the fermentation broth and an extractant; increases the efficiency of the butanol production by increasing recovery and recycling of an extractant; or increases the efficiency of the butanol production by decreasing a flow rate of an extractant.
  • the present invention is also directed to a system for producing butanol comprising a liquefaction vessel configured to liquefy a feedstock to create a feedstock slurry, the liquefaction vessel comprising: an inlet for receiving the feedstock; and an outlet for discharging a feedstock slurry, wherein the feedstock slurry comprises sugar and undissolved solids; a centrifuge configured to remove the undissolved solids from the feedstock slurry to create (i) an aqueous solution comprising the sugar and (ii) a wet cake comprising the portion of the undissolved solids, the centrifuge comprising: an inlet for receiving the feedstock slurry; a first outlet for discharging the aqueous solution; and a second outlet for discharging the wet cake; and a fermentor configured to ferment the aqueous solution to produce butanol, the fermentor comprising: a first inlet for receiving the aqueous solution; a second inlet for receiving an extractant; a first outlet
  • the centrifuge further comprises a third outlet for discharging an oil created while removing the undissolved solids from the feedstock slurry.
  • the apparatus further comprises a saccharification vessel configured to saccharify the sugar in the feedstock slurry, the saccharification vessel comprising: an inlet for receiving the feedstock slurry; and an outlet for discharging the feedstock slurry.
  • the apparatus further comprises a saccharification vessel configured to saccharify the sugar in the aqueous solution, the saccharification vessel comprising: an inlet for receiving the aqueous solution; and an outlet for discharging the aqueous solution.
  • the apparatus further comprises a dry mill configured to grind the feedstock, the dry mill comprising: an inlet for receiving the feedstock; and an outlet for discharging ground feedstock.
  • the present invention is also directed to a composition
  • a composition comprising: 20-35 wt% crude protein, 1-20 wt% crude fat, 0-5 wt% triglycerides, 4-10 wt% fatty acids, and 2-6 wt% fatty acid isobutyl esters.
  • the present invention is also directed to a composition comprising: 25-31 wt% crude protein, 6-10 wt% crude fat, 4-8 wt% triglycerides, 0-2 wt% fatty acids, and 1-3 wt% fatty acid isobutyl esters.
  • the present invention is also directed to a composition
  • a composition comprising: 20-35 wt% crude protein, 1-20 wt% crude fat, 0-5 wt% triglycerides, 4-10 wt% fatty acids, and 2-6 wt% fatty acid isobutyl esters.
  • the present invention is also directed to a composition comprising: 26-34 wt% crude protein, 15-25 wt% crude fat, 12-20 wt% triglycerides, 1-2 wt% fatty acids, 2-4 wt% fatty acid isobutyl esters, 1-2 wt% lysine, 11-23 wt% NDF, and 5-11 wt% ADF.
  • a method comprising: (a) providing a feedstock slurry comprising fermentable carbon and undissolved solids from said biomass and water; (b) separating a substantial portion of the undissolved solids from said slurry whereby (i) an aqueous solution comprising fermentable carbon and (ii) a wet cake co-product comprising solids are generated; and (c) adding the aqueous solution to a fermentation broth comprising recombinant microorganisms in a fermentation vessel whereby a fermentative product is produced; wherein the biomass processing productivity is improved.
  • the improved biomass processing productivity comprises improved fermentative product and co-product recoverability relative to a fermentative product produced in the presence of undissolved solids.
  • the improved biomass processing productivity includes one or more of increased process stream recyclability, increased fermentor volume efficiency and increased corn load feeding.
  • the increased process stream recyclability includes one or more of fermentative recombinant microorganism recycle, water recycle, and energy efficiency.
  • the process can also include (d) contacting the fermentation broth of (c) with an extractant wherein the extractant has increased extraction efficiency relative to a fermentation broth comprising undissolved solids.
  • the increased extraction efficiency includes one or more of stabilized partition coefficient, enhanced phase separation, enhanced mass transfer coefficient, and increased process stream recyclability.
  • increased extraction efficiency includes one or more of stabilized partition coefficient of the extractant, enhanced phase separation of the extractant from the fermentation broth, enhanced liquid- liquid mass transfer coefficient, and increased extractant recovery and recyclability.
  • the increased extraction efficiency includes preserved extractant for recycle.
  • the aqueous solution has a viscosity of less than about
  • the aqueous solution contains less than about 20 g/L monomeric glucose.
  • the improved product recoverability provides for improved recombinant microorganism tolerance to the product.
  • the improved tolerance is provided by one or more of removal of inhibitors with the undissolved solids or increased liquid-liquid mass transfer coefficient.
  • the improved extractant efficiency provides for improved recombinant microorganism tolerance.
  • the improved recombinant microorganism tolerance is provided by extraction of inhibitors, by-products, and metabolites.
  • the feedstock slurry comprises oil from the feedstock and said oil is separated from the slurry in step (b).
  • the wet cake comprises feedstock oil in an amount of less than about 20% of dry solids content of the wet cake.
  • the substantial portion of undissolved solids separated from the feedstock slurry in step (b) is at least about 75% by weight of undissolved solids. In some embodiments, the substantial portion of undissolved solids separated from the feedstock slurry in step (b) is at least about 90%> by weight of undissolved solids. In some embodiments, the substantial portion of undissolved solids separated from the feedstock slurry in step (b) is at least about 95% by weight of undissolved solids.
  • step (b) comprises centrifuging the feedstock slurry. In some embodiments, centrifuging the feedstock slurry separates the feedstock into a first liquid phase comprising the aqueous solution and a solid phase comprising the wet cake. In some embodiments, the wet cake is washed with water to recover sugar or sugar source present in the wet cake. In some embodiments, the liquid phase comprising the aqueous solution is centrifuged more than once.
  • the extractant is an organic extractant.
  • the extractant comprises one or more immiscible organic extractants selected from the group consisting of C 12 to C 22 fatty alcohols, C 12 to C 22 fatty acids, esters of C 12 to C 22 fatty acids, C 12 to C 22 fatty aldehydes, C 12 to C 22 fatty amides, and mixtures thereof.
  • the fermentative recombinant microorganism is a bacteria or yeast cell.
  • the product is a product alcohol selected from the group consisting of butanol and isomers thereof.
  • the method also includes (d) at least partially vaporizing the fermentation broth and product of (c) and optionally CO 2 wherein a vapor stream is produced and recover the product from the vapor stream.
  • the method also includes contacting the vapor stream with an absorption liquid phase wherein at least a portion of the vapor stream is absorbed into the absorption liquid phase, wherein the temperature of the onset of the absorption of the vapor stream into the absorption liquid phase is greater than the temperature of the onset of condensation of the vapor stream in the absence of the absorption liquid phase.
  • the vaporizing and contacting steps are carried out under vacuum conditions.
  • the separating a substantial portion of the undissolved solids from said slurry may provide for a higher vapor pressure of the fermentation broth relative to a fermentation broth comprising undissolved solids.
  • the higher vapor pressure provides for more efficient vaporization product recovery.
  • the more efficient vaporization product recovery includes one or more of lower capital investment, smaller vaporization, absorption, compression, and refrigeration equipment, improved mass transfer rates, less energy for vaporization, and lower absorbent flow rate.
  • separating a substantial portion of the undissolved solids is performed such that starch loss to the undissolved solids is minimized.
  • the starch loss is minimized by performing one or more optimization operations including temperature control, enzyme concentration, pH, particle size of ground corn, and reaction time during liquefaction; centrifugation operating conditions; and wet cake wash conditions.
  • the wet cake is further processed to provide an improved co-product.
  • the co-product is further processed to DDGS.
  • the DDGS has an improved product profile comprising less feedstock oil relative to DDGS produced in the presence of undissolved solids.
  • the DDGS has an improved product profile such that the DDGS is produced with minimal contaminating contact with the fermentation broth, the recombinant microorganism, fermentative products, and extractant.
  • DDGS produced by the above methods meets dietary labeling requirements for organic animal feed.
  • a fermentation broth includes a fermentative product portion and a corn oil portion in a ratio of at least about 4: 1 by weight, wherein said broth is substantially free of undissolved solids.
  • the corn oil portion contains at least about 15 weight % free fatty acids.
  • the fermentation broth contains no more than about 15% by weight of undissolved solids.
  • the fermentation broth contains no more than about 10% by weight of undissolved solids.
  • the fermentation broth contains no more than about 5% by weight of undissolved solids.
  • a centrifuge product profile includes a layer of undissolved solids, a corn oil layer and a supernatant layer comprising fermentable sugars, wherein a ratio fermentable sugars in the supernatant layer to undissolved solids in the undissolved solids layer on a weight basis is in a range from about 2: 1 to about 5: 1; a ratio of fermentable sugars in the supernatant layer to corn oil in the corn oil layer on a weight basis is in a range from about 10: 1 to about 50: 1; and a ratio of undissolved solids in the undissolved solids layer to corn oil in the corn oil layer on a weight basis is in a range from about 2: 1 to about 25 : 1.
  • a method for producing butanol includes the steps of (a) providing a corn feedstock; (b) liquefying the corn feedstock to create a feedstock slurry, wherein the feedstock slurry comprises sugar, corn oil, and undissolved solids; (c) removing undissolved solids from the feedstock slurry to create (i) an aqueous solution comprising sugar, (ii) a wet cake comprising undissolved solids, and (iii) a free corn oil phase; (d) contacting the aqueous solution with a broth in a fermentor; (e) fermenting the sugar in the fermentor to produce butanol; and (f) performing in situ removal of the butanol from the broth as the butanol is produced, wherein removal of the undissolved solids from the feedstock slurry increases the efficiency of the butanol production.
  • the undissolved solids comprise germ, fiber, and gluten.
  • the method also includes dry milling
  • step (c) comprises centrifuging the feedstock slurry.
  • centrifuging the feedstock slurry separates the feedstock slurry into a first liquid phase comprising the aqueous solution, a solid phase comprising the wet cake, and a second liquid phase comprising the free corn oil.
  • the wet cake is washed with water to recover sugar present in the wet cake.
  • the liquid phase comprising the aqueous solution is centrifuged more than once.
  • at least about 75% by weight of the undissolved solids are removed from the feedstock slurry in step (c).
  • at least about 90% by weight of the undissolved solids are removed from the feedstock slurry in step (c).
  • at least about 95% by weight of the undissolved solids are removed from the feedstock slurry in step (c).
  • the in situ removal comprises liquid-liquid extraction.
  • an extractant for the liquid-liquid extraction is an organic extractant.
  • the organic extractant comprises oleyl alcohol.
  • the broth comprises a microorganism.
  • the microorganism is a bacteria or yeast cell.
  • a portion of the broth exits the fermentor and the method further comprises separating the yeast present in the portion of the broth therefrom and returning the separated yeast to the fermentor.
  • the portion of the broth comprises no more than about 25% by weight of the undissolved solids present in the feedstock slurry.
  • the portion of the broth comprises no more than about 10% by weight of the undissolved solids present in the feedstock slurry.
  • the portion of the broth comprises no more than about 5% by weight of the undissolved solids present in the feedstock slurry.
  • saccharification of the sugar in the aqueous solution occurs simultaneously with fermenting the sugar in the fermentor.
  • the method also includes saccharifying the sugar prior to fermenting the sugar in the fermentor.
  • step (c) includes centrifuging the feedstock slurry.
  • centrifuging the feedstock slurry occurs prior to saccharifying the sugar.
  • centrifuging the feedstock slurry occurs after saccharifying the sugar.
  • the butanol is isobutanol.
  • step (c) increases the efficiency of the butanol production by increasing a liquid-liquid mass transfer coefficient of the butanol from the broth to the extractant.
  • step (c) increases the efficiency of the butanol production by increasing an extraction efficiency of the butanol with an extractant.
  • step (c) increases the efficiency of the butanol production by increasing a rate of phase separation between the broth and an extractant.
  • step (c) increases the efficiency of the butanol production by increasing recovery and recycling of an extractant.
  • step (c) increases the efficiency of the butanol production by decreasing a flow rate of an extractant.
  • step (c) includes one or more of stabilized partition coefficient of the extractant, increased fermentor volume frequency, increased corn load feeding, increased fermentative recombinant microorganism recycle, increased water recycle, increased energy efficiency, improved recombinant microorganism tolerance to the butanol, lowered aqueous phase titer, and improved value of DDGS.
  • a system for producing butanol includes (a) a liquefaction vessel configured to liquefy a feedstock to create a feedstock slurry, the liquefaction vessel comprising an inlet for receiving the feedstock, an outlet for discharging a feedstock slurry, wherein the feedstock slurry comprises sugar and undissolved solids; (b) a centrifuge configured to remove the undissolved solids from the feedstock slurry to create (i) an aqueous solution comprising the sugar and (ii) a wet cake comprising the portion of the undissolved solids, the centrifuge comprising an inlet for receiving the feedstock slurry, a first outlet for discharging the aqueous solution, and a second outlet for discharging the wet cake; and (c) a fermentor for fermenting the aqueous solution in the fermentor to produce butanol, the fermentor comprising a first inlet for receiving the aqueous solution, a second inlet for
  • the centrifuge further comprises a third outlet for discharging an oil created while removing the undissolved solids from the feedstock slurry.
  • the system also includes a saccharification vessel configured to saccharify the sugar in the feedstock slurry, the saccharification vessel comprising an inlet for receiving the feedstock slurry and an outlet for discharging the feedstock slurry.
  • the system also includes a saccharification vessel configured to saccharify the sugar in the aqueous solution, the saccharification vessel comprising an inlet for receiving the aqueous and an outlet for discharging the aqueous solution.
  • the system also includes a dry mill configured to grind the feedstock, the dry mill comprising an inlet for receiving the feedstock and an outlet for discharging ground feedstock.
  • a wet cake formed in a centrifuge from a corn mash slurry, wherein the wet cake comprises undissolved solids includes at least about 75% by weight of the undissolved solids present in the corn mash slurry. In some embodiments, the wet cake includes at least about 90% by weight of the undissolved solids present in the corn mash slurry. In some embodiments, the wet cake includes at least about 95% by weight of the undissolved solids present in the corn mash slurry.
  • an aqueous solution formed in a centrifuge from a corn mash slurry, wherein the aqueous solution comprises undissolved solids includes no more than about 25% by weight of the undissolved solids present in the corn mash slurry. In some embodiments, the aqueous solution includes no more than about 10% by weight of the undissolved solids present in the corn mash slurry. In some embodiments, the aqueous solution includes no more than about 5% by weight of the undissolved solids present in the corn mash slurry.
  • FIG. 1 schematically illustrates an exemplary method and system of the present invention, in which undissolved solids are removed in a centrifuge after liquefaction and before fermentation.
  • FIG. 2 schematically illustrates an exemplary alternative method and system of the present invention, in which feedstock is milled.
  • FIG. 3 schematically illustrates another exemplary alternative method and system of the present invention, in which the centrifuge discharges an oil stream.
  • FIG. 4 schematically illustrates another exemplary alternative method and system of the present invention, in which a saccharification vessel is placed between the centrifuge and the fermentor.
  • FIG. 5 schematically illustrates another exemplary alternative method and system of the present invention, in which a saccharification vessel is placed between the liquefaction vessel and the centrifuge.
  • FIG. 6 schematically illustrates another exemplary alternative method and system of the present invention, in which two centrifuges are utilized in series to remove the undissolved solids.
  • FIG. 7 illustrates the effect of the presence of undissolved corn mash solids on the overall volumetric mass transfer coefficient, k ⁇ a, for the transfer of z ' -BuOH from an aqueous solution of liquefied corn starch (i.e., oligosaccharides) to a dispersion of oleyl alcohol droplets flowing up through a bubble column when a nozzle with an inner diameter of 2.03 mm is used to disperse the oleyl alcohol.
  • liquefied corn starch i.e., oligosaccharides
  • FIG. 8 illustrates the effect of the presence of undissolved corn mash solids on the overall volumetric mass transfer coefficient, for the transfer of z ' -BuOH from an aqueous solution of liquefied corn starch (i.e., oligosaccharides) to a dispersion of oleyl alcohol droplets flowing up through a bubble column when a nozzle with an inner diameter of 0.76 mm is used to disperse the oleyl alcohol.
  • liquefied corn starch i.e., oligosaccharides
  • FIG 9 illustrates the position of the liquid-liquid interface in the fermentation sample tubes as a function of (gravity) settling time. Phase separation data shown for run times: 5.3, 29.3, 53.3, and 70.3 hrs run time. Sample data from extractive-fermentation where solids were removed from the mash feed, and OA was the solvent (2010Y035).
  • FIG. 10 illustrates the position of the liquid-liquid interface of the final fermentation broth as a function of (gravity) settling time. Data from extractive- fermentation where solids were removed from the mash feed, and OA was the solvent (2010Y035).
  • FIG. 11 illustrate the concentration of glucose in the aqueous phase of the slurries as a function of time for Batch 1 and Batch 2.
  • FIG. 12 illustrates concentration of glucose in the aqueous phase of the slurries as a function of time for Batch 3 and Batch 4.
  • FIG. 13 illustrates the effect of enzyme loading and +/- a high temperature stage was applied at some time during the liquefaction on starch conversion.
  • compositions, a mixture, a process, a method, an article, or an apparatus that comprises a list of elements is not necessarily limited to only those elements but can include other elements not expressly listed or inherent to such composition, mixture, process, method, article, or apparatus.
  • “or” refers to an inclusive or and not to an exclusive or. For example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).
  • invention or “present invention” as used herein is a non-limiting term and is not intended to refer to any single embodiment of the particular invention but encompasses all possible embodiments as described in the application.
  • the term "about" modifying the quantity of an ingredient or reactant of the invention employed refers to variation in the numerical quantity that can occur, for example, through typical measuring and liquid handling procedures used for making concentrates or solutions in the real world; through inadvertent error in these procedures; through differences in the manufacture, source, or purity of the ingredients employed to make the compositions or to carry out the methods; and the like.
  • the term “about” also encompasses amounts that differ due to different equilibrium conditions for a composition resulting from a particular initial mixture. Whether or not modified by the term “about,” the claims include equivalents to the quantities.
  • the term “about” means within 10% of the reported numerical value, alternatively within 5% of the reported numerical value.
  • Biomass refers to a natural product containing hydro lyzable polysaccharides that provide fermentable sugars including any sugars and starch derived from natural resources such as corn, sugar cane, wheat, cellulosic or lignocellulosic material and materials comprising cellulose, hemicellulose, lignin, starch, oligosaccharides, disaccharides and/or monosaccharides, and mixtures thereof. Biomass may also comprise additional components such as protein and/or lipids. Biomass may be derived from a single source or biomass can comprise a mixture derived from more than one source.
  • biomass may comprise a mixture of corn cobs and corn stover, or a mixture of grass and leaves.
  • Biomass includes, but is not limited to, bioenergy crops, agricultural residues, municipal solid waste, industrial solid waste, sludge from paper manufacture, yard waste, wood and forestry waste.
  • biomass examples include, but are not limited to, corn grain, corn cobs, crop residues such as corn husks, corn stover, grasses, wheat, rye, wheat straw, barley, barley straw, hay, rice straw, switchgrass, waste paper, sugar cane bagasse, sorghum, sugar cane, soy, components obtained from milling of grains, trees, branches, roots, leaves, wood chips, sawdust, shrubs and bushes, vegetables, fruits, flowers, animal manure, and mixtures thereof.
  • mash, juice, molasses, or hydrolysate may be formed from biomass by any processing known in the art for processing the biomass for purposes of fermentation such as by milling, treating, and/or liquefying and comprises fermentable sugar and may comprise water.
  • cellulosic and/or lignocellulosic biomass may be processed to obtain a hydrolysate containing fermentable sugars by any method known to one skilled in the art.
  • a low ammonia pretreatment is disclosed in U.S. Patent Application Publication No. 2007/0031918A1, which is herein incorporated by reference.
  • Enzymatic saccharification of cellulosic and/or lignocellulosic biomass typically makes use of an enzyme consortium for breaking down cellulose and hemicellulose to produce a hydrolysate containing sugars including glucose, xylose, and arabinose.
  • Sacharification enzymes suitable for cellulosic and/or lignocellulosic biomass are reviewed in Lynd, et al. (Microbiol. Mol. Biol. Rev. 66:506-577, 2002).
  • Dried Distillers' Grains with Solubles refers to a co- product or by-product from a fermentation of a feedstock or biomass (e.g., fermentation of grain or grain mixture that produces a product alcohol).
  • DDGS may also refer to an animal feed produced from a process of making a product alcohol (e.g., butanol, isobutanol, etc.).
  • fermentable carbon source or “fermentable carbon substrate” as used herein means a carbon source capable of being metabolized by microorganisms.
  • suitable fermentable carbon sources include, but are not limited to, monosaccharides such as glucose or fructose; disaccharides such as lactose or sucrose; oligosaccharides; polysaccharides such as starch or cellulose; one carbon substrates; and mixtures thereof.
  • “Fermentable sugar” as used herein refers to one or more sugars capable of being metabolized by the microorganisms disclosed herein for the production of fermentative alcohol.
  • Feedstock as used herein means a feed in a fermentation process, the feed containing a fermentable carbon source with or without undissolved solids, and where applicable, the feed containing the fermentable carbon source before or after the fermentable carbon source has been liberated from starch or obtained from the break down of complex sugars by further processing such as by liquefaction, saccharification, or other process.
  • Feedstock includes or is derived from a biomass. Suitable feedstocks include, but are not limited to, rye, wheat, corn, corn mash, cane, cane mash, barley, cellulosic material, lignocellulosic material, or mixtures thereof. Where reference is made to "feedstock oil,” it will be appreciated that the term encompasses the oil produced from a given feedstock.
  • Frermentation broth as used herein means the mixture of water, sugars
  • fertilizer (fermentable carbon sources), dissolved solids, optionally microorganisms producing alcohol, product alcohol, and all other constituents of the material held in the fermentation vessel in which product alcohol is being made by the reaction of sugars to alcohol, water, and carbon dioxide (C0 2 ) by the microorganisms present.
  • the term "fermentation medium” and “fermented mixture” can be used synonymously with “fermentation broth.”
  • Frermentation vessel as used herein means the vessel in which the fermentation reaction is carried out whereby product alcohol such as butanol is made from sugars.
  • product alcohol such as butanol is made from sugars.
  • fermentor can be used synonymously herein with “fermentation vessel.”
  • saccharification vessel as used herein means the vessel in which saccharification (i.e., the break down of oligosaccharides into monosaccharides) is carried out. Where fermentation and saccharification occur simultaneously, the saccharification vessel and the fermentation vessels may be the same vessel.
  • saccharification enzyme means one or more enzymes that are capable of hydro lyzing polysaccharides and/or ologosaccharides, for example, alpha- 1,4- glucosidic bonds of glycogen, or starch. Saccharification enzymes may include enzymes capable of hydro lyzing cellulosic or ligncellulosic materials as well.
  • Liquefaction vessel as used herein means the vessel in which liquefaction is carried out. Liquefaction is the process in which oligosaccharides are liberated from the feedstock. In embodiments where the feedstock is corn, oligosaccharides are liberated from the corn starch content during liquefaction.
  • “Sugar” as used herein refers to oligosaccharides, disaccharides, monosaccharides, and/or mixtures thereof.
  • saccharide also includes carboydrates including starches, dextrans, glycogens, cellulose, pentosans, as well as sugars.
  • Undissolved solids as used herein means non-fermentable portions of feedstock which are not dissolved in the liquid phase, for example, germ, fiber, and gluten.
  • the non-fermentable portions of feedstock include the portion of feedstock that remains as solids and can absorb liquid from the fermentation broth.
  • Extractant as used herein means an organic solvent used to extract any butanol isomer.
  • ISPR In situ Product Removal
  • Product alcohol refers to any alcohol that can be produced by a microorganism in a fermentation process that utilizes biomass as a source of fermentable carbon substrate.
  • Product alcohols include, but are not limited to, Ci to Cg alkyl alcohols.
  • the product alcohols are C 2 to Cg alkyl alcohols.
  • the product alcohols are C 2 to C5 alkyl alcohols.
  • Ci to C8 alkyl alcohols include, but are not limited to, methanol, ethanol, propanol, butanol, and pentanol.
  • C 2 to Cg alkyl alcohols include, but are not limited to, ethanol, propanol, butanol, and pentanol.
  • Alcohol is also used herein with reference to a product alcohol.
  • butanol refers with specificity to the butanol isomers 1 -butanol
  • Propanol refers to the propanol isomers isopropanol or 1- propanol.
  • Pentanol refers to the pentanol isomers 1-pentanol, 3-methyl-l- butanol, 2 -methyl- 1 -butanol, 2,2-dimethyl-l -propanol, 3-pentanol, 2-pentanol, 3-methyl- 2-butanol, or 2-methyl-2-butanol.
  • aqueous phase titer refers to the concentration of a particular alcohol (e.g., butanol) in the fermentation broth.
  • the term "effective titer" as used herein refers to the total amount of a particular alcohol (e.g., butanol) produced by fermentation or alcohol equivalent of the alcohol ester produced by alcohol esterification per liter of fermentation medium.
  • a particular alcohol e.g., butanol
  • aqueous phase refers to the aqueous phase of a biphasic mixture obtained by contacting a fermentation broth with a water-immiscible organic extractant.
  • fermentation broth then specifically refers to the aqueous phase in biphasic fermentative extraction.
  • organic phase refers to the non-aqueous phase of a biphasic mixture obtained by contacting a fermentation broth with a water-immiscible organic extractant.
  • the present invention provides systems and methods for producing a fermentative product such as a product alcohol, through fermentation as well as increasing biomass processing productivity and cost effectiveness.
  • the product alcohol is butanol.
  • a feedstock can be liquefied to create a feedstock slurry, wherein the feedstock slurry includes soluble sugar and undissolved solids. If the feedstock slurry is fed directly to the fermentor, the undissolved solids may interfere with efficient removal and recovery of a product alcohol such as butanol from the fermentor.
  • the presence of the undissolved particulates may cause system inefficiencies including, but not limited to, decreasing the mass transfer rate of the butanol to the extractant by interfering with the contact between the extractant and the fermentation broth; creating an emulsion in the fermentor and thereby interfering with good phase separation of the extractant and the fermentation broth; reducing the efficiency of recovering and recycling the extractant because at least a portion of the extractant and butanol becomes "trapped" in the solids which are ultimately removed as Distillers' Dried Grains with Solubles (DDGS); a lower fermentor volume efficiency because there are solids taking up volume in the fermentor and because there is a slower disengagement of the extractant from the fermentation broth; and shortening the life cycle of the extractant by contamination with corn oil.
  • DDGS Distillers' Dried Grains with Solubles
  • the extractant "trapped" in the DDGS may detract from DDGS value and qualification for sale as animal feed.
  • at least a portion of the undissolved particles (or solids) are removed from the feedstock slurry prior to the addition of sugar present in the feedstock slurry to the fermentor. Extraction activity and the efficiency of the butanol production are increased when extraction is performed on a fermentation broth containing an aqueous solution wherein undissolved particles have been removed relative to extraction performed on a fermentation broth containing an aqueous solution wherein undissolved particles have not been removed.
  • the system includes a liquefaction vessel 10 configured to liquefy a feedstock to create a feedstock slurry.
  • a feedstock 12 can be introduced to an inlet in liquefaction vessel 10.
  • Feedstock 12 can be any suitable biomass material known in the industry including, but not limited to, rye, wheat, cane, or corn, that contains a fermentable carbon source such as starch.
  • the process of liquefying feedstock 12 involves hydrolysis of starch in feedstock
  • any known liquefying processes, as well as the corresponding liquefaction vessel, normally utilized by the industry can be used including, but not limited to, the acid process, the acid-enzyme process, or the enzyme process. Such processes can be used alone or in combination.
  • the enzyme process can be utilized and an appropriate enzyme 14, for example, alpha-amylase, is introduced to an inlet in liquefaction vessel 10. Water can also be introduced to the liquefaction vessel 10.
  • feedstock slurry 16 that includes sugar (e.g., fermentable carbon) and undissolved solids from the feedstock or biomass.
  • the undissolved solids are non-fermentable portions of feedstock 12.
  • feedstock 12 can be corn, such as dry milled, unfractionated corn kernels, and the undissolved particles can include germ, fiber, and gluten.
  • Feedstock slurry 16 can be discharged from an outlet of liquefaction vessel 10.
  • feedstock 12 is corn or corn kernels and feedstock slurry 16 is a corn mash slurry.
  • a centrifuge 20 configured to remove the undissolved solids from feedstock slurry
  • feedstock slurry 16 has an inlet for receiving feedstock slurry 16.
  • Centrifuge 20 agitates or spins feedstock slurry 16 to create a liquid phase or aqueous solution 22 and a solid phase or wet cake 24.
  • Aqueous solution 22 can include the sugar, for example, in the form of oligosaccharides, and water.
  • Aqueous solution can comprise at least about 10% by weight oligosaccharides, at least about 20% by weight of oligosaccharides, or at least about 30%) by weight of oligosaccharides.
  • Aqueous solution 22 can be discharged out an outlet located near the top of centrifuge 20.
  • Aqueous solution can have a viscosity of less than about 20 centipoise.
  • the aqueous solution can comprise less than about 20 g/L of monomeric glucose, more preferably less than about 10 g/L, or less than about 5 g/L of monomeric glucose. Suitable methodology to determine the amount of monomeric glucose is well known in the art. Such suitable methods known in the art include HPLC.
  • Wet cake 24 can include the undissolved solids. Wet cake 24 can be discharged from an outlet located near the bottom of centrifuge 20. Wet cake 24 can also include a portion of the sugar and water. Wet cake 24 can be washed with additional water in centrifuge 20 once aqueous solution 22 has been discharged from centrifuge 20. Alternatively, wet cake 24 can be washed with additional water in a separate centrifuge. Washing wet cake 24 will recover the sugar or sugar source (e.g., oligosaccharides) present in the wet cake, and the recovered sugar and water can be recycled to the liquefaction vessel 10.
  • sugar or sugar source e.g., oligosaccharides
  • wet cake 24 can be dried to form Dried Distillers' Grains with Solubles (DDGS) through any suitable known process.
  • DDGS Dried Distillers' Grains with Solubles
  • the formation of the DDGS from wet cake 24 formed in centrifuge 20 has several benefits. Since the undissolved solids do not go to the fermentor, extractant and/or butanol are not trapped in the DDGS, DDGS is not subjected to the conditions of the fermentor, and DDGS does not contact the microorganisms present in the fermentor. All these effects provide benefits to subsequent processing and selling of DDGS, for example as animal feed.
  • Centrifuge 20 can be any conventional centrifuge utilized in the industry, including, for example, a decanter bowl centrifuge, tricanter centrifuge, disk stack centrifuge, filtering centrifuge, or decanter centrifuge.
  • removal of the undissolved solids from feedstock slurry 16 can be accomplished by filtration, vacuum filtration, beltfilter, pressure filtration, filtration using a screen, screen separation, grates or grating, porous grating, flotation, hydroclone, filter press, screwpress, gravity settler, vortex separator, or any method that may be used to separate solids from liquids.
  • undissolved solids may be removed from corn mash to form two product streams, for example, an aqueous solution of oligosaccharides which contains a lower concentration of solids as compared to corn mash and a wet cake which contains a higher concentration of solids as compared to corn mash.
  • a third stream containing corn oil may be generated if a tricantor centrifuge is utilized for solids removal from corn mash.
  • a number of product streams may be generated by using different separation techniques or a combination thereof.
  • wet cake 24 is a composition formed from feedstock slurry
  • wet cake 24 includes at least about 50% by weight of the undissolved particles present in the feedstock slurry, at least about 55% by weight of the undissolved particles present in the feedstock slurry, at least about 60% by weight of the undissolved particles present in the feedstock slurry, at least about 65 % by weight of the undissolved particles present in the feedstock slurry, at least about 70% by weight of the undissolved particles present in the feedstock slurry, at least about 75% by weight of the undissolved particles present in the feedstock slurry, at least about 80% by weight of the undissolved particles present in the feedstock slurry, at least about 85% by weight of the undissolved particles present in the feedstock slurry, at least about 90% by weight of the undissolved particles present in the feedstock slurry, at least about 95% by weight of the undissolved particles present in the feedstock slurry, or about 99% by weight of the undissolved particles present in the feedstock slurry.
  • aqueous solution 22 formed from feedstock slurry 16, for example, a corn mash slurry, in centrifuge 20 includes no more than about 50% by weight of the undissolved particles present in the feedstock slurry, no more than about 45% by weight of the undissolved particles present in the feedstock slurry, no more than about 40%) by weight of the undissolved particles present in the feedstock slurry, no more than about 35%) by weight of the undissolved particles present in the feedstock slurry, no more than about 30% by weight of the undissolved particles present in the feedstock slurry, no more than about 25% by weight of the undissolved particles present in the feedstock slurry, no more than about 20% by weight of the undissolved particles present in the feedstock slurry, no more than about 15% by weight of the undissolved particles present in the feedstock slurry, no more than about 10% by weight of the undissolved particles present in the feedstock slurry, no more than about 5% by weight of the undissolved particles present in the feedstock slurry
  • a fermentor 30 configured to ferment aqueous solution 22 to produce butanol has an inlet for receiving aqueous solution 22.
  • Fermentor 30 can include a fermentation broth.
  • a microorganism 32 selected from the group of bacteria, cyanobacteria, filamentous fungi, and yeasts is introduced to fermentor 30 to be included in the fermentation broth.
  • microorganism 32 can be a bacteria such as E.coli.
  • microorganism 32 can be S. cerevisiae.
  • Microorganism 32 consumes the sugar in aqueous solution 22 and produces butanol.
  • microorganism 32 can be a fermentative recombinant microorganism.
  • the microorganism 32 is engineered to contain a biosynthetic pathway.
  • the biosynthetic pathway is a butanol biosynthetic pathway.
  • the biosynthetic pathway converts pyruvate to a fermentative product.
  • the biosynthetic pathway comprises at least one heterologous polynucleotide encoding a polypeptide which catalyzes a substrate to product conversion of the biosynthetic pathway.
  • each substrate to product conversion of the biosynthetic pathway is catalyzed by a polypeptide encoded by a heterologous polynucleotide.
  • ISPR In situ product removal
  • butanol is produced by the microorganism, for example, by liquid- liquid extraction.
  • Liquid-liquid extraction is described briefly below and can be performed according to the processes described in U.S. Patent Application Publication No. 2009/0305370, the disclosure of which is hereby incorporated in its entirety.
  • Fermentor 30 has an inlet for receiving an extractant 34.
  • Extractant 34 can be an organic extractant selected from the group consisting of saturated, mono-unsaturated, poly-unsaturated (and mixtures thereof) C 12 to C 22 fatty alcohols, C 12 to C 22 fatty acids, esters of C 12 to C 22 fatty acids, C 12 to C 22 fatty aldehydes, C 12 to C 22 fatty amides, and mixtures thereof.
  • the extractant may also be an organic extractant selected from the group consisting of saturated, mono-unsaturated, poly-unsaturated (and mixtures thereof) C 4 to C 22 fatty alcohols, C 4 to C 2 g fatty acids, esters of C 4 to C 2 g fatty acids, C 4 to C 22 fatty aldehydes, and mixtures thereof.
  • Extractant 34 can be an organic extractant such as oleyl alcohol, behenyl alcohol, cetyl alcohol, lauryl alcohol, myristyl alcohol, stearyl alcohol, 1-undecanol, oleic acid, lauric acid, myristic acid, stearic acid, methyl myristate, methyl oleate, undecanal, lauric aldehyde, 20-methylundecanal, and mixtures thereof. Extractant 34 contacts the fermentation broth and butanol present in the fermentation broth is transferred to extractant 34.
  • a stream 36 of extractant rich with butanol is discharged through an outlet in fermentor 30. Butanol is subsequently separated from the extractant in stream 36 using conventional techniques. Feed stream may be added to fermentor 30.
  • Fermentor 30 can be any suitable fermentor known in the art.
  • simultaneous saccharification and fermentation can occur inside fermentor 30.
  • Any known saccharification process normally utilized by the industry can be used including, but not limited to, the acid process, the acid-enzyme process, or the enzyme process.
  • an enzyme 38 such as glucoamylase, can be introduced to an inlet in fermentor 30 in order to break down sugars in the form of oligosaccharides present in aqueous solution 22 into monosaccharides.
  • fermentation broth 40 can be discharged from an outlet in fermentor 30.
  • the discharged fermentation broth 40 can include microorganism 32 such as a yeast.
  • Microorganism 32 can be easily separated from the fermentation broth 40, for example, in a centrifuge (not shown). Microorganism 32 can then be recycled to fermentor 30 which over time can increase the production rate of butanol, thereby resulting in an increase in the efficiency of the butanol production.
  • fermentation broth 40 includes no more than about 50% by weight of the undissolved particles present in the feedstock slurry, no more than about 45% by weight of the undissolved particles present in the feedstock slurry, no more than about 40% by weight of the undissolved particles present in the feedstock slurry, no more than about 35% by weight of the undissolved particles present in the feedstock slurry, no more than about 30% by weight of the undissolved particles present in the feedstock slurry, no more than about 25% by weight of the undissolved particles present in the feedstock slurry, no more than about 20% by weight of the undissolved particles present in the feedstock slurry, no more than about 15%) by weight of the undissolved particles present in the feedstock slurry, no more than about 10%) by weight of the undissolved particles present in the feedstock slurry, no more than about 5% by weight of the undissolved particles present in the feedstock slurry, or no more than about 1% by weight of the undissolved particles present in the feedstock
  • the systems and processes of the present invention can include a mill 50 configured to dry mill a feedstock 52.
  • Feedstock 52 can be the same as feedstock 12 from FIG. 1 and can enter mill 50 through an inlet. Mill 50 can mill or grind feedstock 52.
  • feedstock 52 can be unfractionated.
  • feedstock 52 can be unfractionated corn kernels.
  • Mill 50 can be any suitable known mill, for example, a hammer mill.
  • Dry milled feedstock 54 is discharged from mill 50 through an outlet and enters liquefaction vessel 10. The remainder of FIG. 2 is identical to FIG. 1 and is not described again.
  • the feedstock can be fractionated and/or wet milled as is known in the industry as an alternative to being unfractionated and/or dry milled.
  • Wet milling is a multi-step process that separates a biomass (e.g., corn) into its key components (germ, pericarp fiber, starch, and gluten) in order to capture value from each co-product separately.
  • This process gives a purified starch stream; however, it is costly and includes the separation of the biomass into its non-starch components which is unnecessary for fermentative alcohol production.
  • Fractionation removes fiber and germ, which contains a majority of the lipids present in ground whole corn resulting in a fractionated corn that has a higher starch (endosperm) content. Dry fractionation does not separate the germ from fiber and therefore, it is less expensive than wet milling.
  • fractionation does not remove the entirety of the fiber or germ, and does not result in total elimination of solids. Furthermore, there is some loss of starch in fractionation. Wet milling of corn is more expensive than dry fractionation, but dry fractionation is more expensive than dry grinding of unfractionated corn.
  • the systems and processes of the present invention can include discharging an oil 26 from an outlet of centrifuge 20.
  • FIG. 3 is identical to FIG. 1, except for oil stream 26 exiting centrifuge 20 and therefore will not be described in detail again.
  • Feedstock slurry 16 is separated into a first liquid phase or aqueous solution 22 containing the fermentable sugar, a solid phase or wet cake 24 containing the undissolved solid, and a second liquid phase containing oil 26 which may exit centrifuge 20.
  • feedstock 12 is corn and oil 26 is free corn oil.
  • free corn oil as used herein means corn oil that is freed from the corn germ. Any suitable conventional centrifuge can be used to discharge aqueous solution 22, wet cake 24, and oil 26, for example, a tricanter centrifuge.
  • a portion of the oil from feedstock 12 such as corn oil when the feedstock is corn, remains in wet cake 24.
  • wet cake 24 includes corn oil in an amount of less than about 20% by weight of dry solids content of wet cake 24.
  • the fermentation broth in fermentor 30 includes a reduced amount of corn oil.
  • the fermentation broth substantially free of undissolved solid, can include a product alcohol portion (e.g., butanol) and an oil portion (e.g., corn oil) in a ratio of at least about 4: 1 on a weight basis.
  • the corn oil can contain at least 15% by weight of free fatty acids, for example, 16.7% by weigh of free fatty acids.
  • the fermentation broth has no more than about 25% by weight of undissolved solids, the fermentation broth has no more than about 15% by weight of undissolved solids, the fermentation broth has no more than about 10% by weight of undissolved solids, the fermentation broth has no more than about 5% by weight of undissolved solids, the fermentation broth has no more than about 1% by weight of undissolved solids, or the fermentation broth has no more than about 0.5% by weight of undissolved solids.
  • centrifuge 20 produces a product profile including a layer of undissolved solids, a layer of oil (e.g., corn oil), and a supernatant layer including the fermentable sugars.
  • the ratio of fermentable sugars in the supernatant layer to undissolved solids in the undissolved solids layer on a weight base can be in a range from about 2:1 to about 5: 1; the ratio of fermentable sugars in the supernatant layer to corn oil in the corn oil layer on a weight basis can be in a range from about 10: 1 to about 50: 1; and/or the ratio of undissolved solids in the undissolved solids layer to corn oil in the corn oil layer on a weight basis can be in a range from about 2: 1 to about 25 : 1.
  • system and process of FIG. 2 can be modified to include discharge of an oil stream from centrifuge 20 as discussed above in connection to the system and process of FIG. 3.
  • oil 26 is not discharged separately it may be removed with wet cake 24.
  • wet cake 24 is removed via centrifuge 20, in some embodiments, a portion of the oil from feedstock 12, such as corn oil when the feedstock is corn, remains in wet cake 24.
  • Wet cake 24 can be washed with additional water in the centrifuge once aqueous solution 22 has been discharged from the centrifuge 20. Washing wet cake 24 will recover the sugar (e.g., oligosaccharides) present in the wet cake and the recovered sugar and water can be recycled to the liquefaction vessel 10. After washing, wet cake 24 may be combined with solubles and then dried to form Dried Distillers' Grains with Solubles (DDGS) through any suitable known process.
  • DDGS Dried Distillers' Grains with Solubles
  • the formation of the DDGS from wet cake 24 formed in centrifuge 20 has several benefits. Since the undissolved solids do not go to the fermentation vessel, the DDGS does not have trapped extractant and/or product alcohol such as butanol, it is not subjected to the conditions of the fermentation vessel, and it does not contact the microorganisms present in the fermentation vessel. All these benefits make it easier to process and sell DDGS, for example, as animal feed.
  • oil 26 is not discharged separately from wet cake 24, but rather oil 26 is included as part of wet cake 24 and is ultimately present in the DDGS. In such instances, the oil can be separated from the DDGS and converted to an ISPR extractant for subsequent use in the same or different alcohol fermentation process.
  • Oil 26 may be separated from DDGS using any suitable known process including, for example, a solvent extraction process.
  • DDGS are loaded into an extraction vessel and washed with a solvent such as hexane to remove oil 26.
  • solvents such as hexane
  • Other solvents include, for example, isobutanol, isohexane, ethanol, petroleum distillates such as petroleum ether, or mixtures thereof.
  • DDGS may be treated to remove any residual solvent.
  • DDGS may be heated to vaporize any residual solvent using any method known in the art.
  • DDGS may be subjected to a drying process to remove any residual water.
  • the processed DDGS may be used as a feed supplement for animals such as poultry, livestock, and domestic pets.
  • the resulting oil 26 and solvent mixture may be collected for separation of oil 26 from the solvent.
  • the oil 26/solvent mixture may be processed by evaporation whereby the solvent is evaporated and may be collected and recycled.
  • the recovered oil may be converted to an ISPR extractant for subsequent use in the same or different alcohol fermentation process.
  • Removal of the oil component of the feedstock is advantageous to butanol production because oil present in the fermentor can break down into fatty acids and glycerin.
  • the glycerin can accumulate in the water and reduce the amount of water that is available for recycling throughout the system.
  • removal of the oil component of the feedstock increases the efficiency of the product alcohol production by increasing the amount of water that can be recycled through the system.
  • saccharification can occur in a separate saccharification vessel 60 which is located between centrifuge 20 and fermentor 30 (FIG. 4) or between liquefaction vessel 10 and centrifuge 20 (FIG. 5).
  • FIGs. 4 and 5 are identical to FIG. 1 except for the inclusion of a separate saccharification vessel 60 and that fermentor 30 does not receive enzyme 38.
  • Saccharification vessel 60 can be any suitable known saccharification vessels.
  • an enzyme 38 such as glucoamylase, can be introduced to an inlet in saccharification vessel 60 in order to break sugars in the form of oligosaccharides into monosaccharides.
  • oligosaccharides present in aqueous stream 22 discharged from centrifuge 20 and received in saccharification vessel 60 through an inlet are broken down into monosaccharides.
  • an aqueous solution 62 containing monosaccharides is discharged from saccharification vessel 60 through an outlet and received in fermentor 30.
  • oligosaccharides present in feedstock slurry 16 discharged from liquefaction vessel 10 and received in saccharification vessel 60 through an inlet are broken down into monosaccharides.
  • a feedstock slurry 64 containing monosaccharides is discharged from saccharification vessel 60 through an outlet and received in centrifuge 20.
  • system and processes of FIGs. 2 and 3 can be modified to include a separate saccharification vessel 60 as discussed above in connection to the systems and processes of FIGs. 4 and 5.
  • the systems and processes of the present invention can include a series of two or more centrifuges.
  • FIG. 6 is identical to FIG. 1, except for the addition of a second centrifuge 20' and therefore will not be described in detail again.
  • Aqueous solution 22 discharged from centrifuge 20 can be received in an inlet of centrifuge 20'.
  • Centrifuge 20' can be identical to centrifuge 20 and can operate in the same manner.
  • Centrifuge 20' can remove undissolved solids not separated from aqueous solution 22 in centrifuge 20 to create (i) an aqueous stream 22' similar to aqueous stream 22, but containing reduced amounts of undissolved solids in comparison to aqueous stream 22 and (ii) a wet cake 24' similar to wet cake 24.
  • Aqueous stream 22' can then be introduced to fermentor 30.
  • the systems and processes of FIGs. 2-6 can be modified to include additional centrifuges for removing undissolved solids as discussed above in connection to the systems and processes of FIG. 6.
  • fermentation broth 40 can be discharged from an outlet in fermentor 30.
  • the absence or minimization of the undissolved solids exiting fermentor 30 with fermentation broth 40 has several additional benefits.
  • the need for units and operations in the downstream processing can be eliminated such as, for example, a beer column or distillation column, thereby resulting in an increased efficiency for the product alcohol production.
  • some or all of the whole stillage centrifuges may be eliminated as a result of less undissolved solids in the final broth exiting the fermentor.
  • the processes and systems disclosed in FIGs. 1-6 include removing the undissolved solids from feedstock slurry 16 and as a result, improve the processing productivity of biomass and cost effectiveness.
  • the improved productivity can include having an increased efficiency of butanol production and/or an increased extraction activity relative to processes and systems that do not remove undissolved solids prior to fermentation.
  • the undissolved solids may be further processed to generate other by-products such as DDGS or fatty acid esters.
  • fatty acid esters may be recovered to increase the yield of carbohydrate to product alcohol (e.g., butanol). This may be accomplished by using a solvent to extract fatty acid esters from, for example, the by-product formed by combining and mixing several by-product streams and drying the product of the combining and mixing steps.
  • a solvent-based extraction system for recovering corn oil triglyceride from DDGS is described in U.S. Patent Application Publication No. 2010/0092603, the teachings of which are incorporated by reference herein.
  • solids may be separated from whole stillage ("separated solids") since that stream would contain the largest portion, by far, of fatty acid esters in uncombined by-product streams. These separated solids may then be fed into an extractor and washed with solvent. In one embodiment, the separated solids are turned at least once in order to ensure that all sides of the separated solids are washed with solvent. After washing, the resulting mixture of lipid and solvent, known as miscella, is collected for separation of the extracted lipid from the solvent. For example, the resulting mixture of lipid and solvent may be deposited to a separator for further processing.
  • the miscella may be discharged from the extractor or separator through a device that separates or scrubs the fines from the miscella.
  • the miscella may be subjected to a distillation step.
  • the miscella can, for example, be processed through an evaporator which heats the miscella to a temperature that is high enough to cause vaporization of the solvent, but is not sufficiently high to adversely affect or vaporize the extracted lipid.
  • the solvent evaporates, it may be collected, for example, in a condenser, and recycled for future use. Separation of the solvent from the miscella results in a stock of crude lipid which may be further processed to separate water, fatty acid esters (e.g., fatty acid isobutyl esters), fatty acids, and triglycerides.
  • fatty acid esters e.g., fatty acid isobutyl esters
  • fatty acids e.g., fatty acids, and triglycerides.
  • the solids may be conveyed out of the extractor and subjected to a stripping process that removes residual solvent. Recovery of residual solvent is important to process economics.
  • the wet solids can be conveyed in a vapor tight environment to preserve and collect solvent that transiently evaporates from the wet solids as it is conveyed into the desolventizer. As the solids enter the desolventizer, they may be heated to vaporize and remove the residual solvent.
  • the desolventizer may include a mechanism for distributing the solids over one or more trays, and the solids may be heated directly, such as through direct contact with heated air or steam, or indirectly, such as by heating the tray carrying the meal.
  • the trays carrying the solids may include openings that allow the solids to pass from one tray to the next.
  • the solids may be conveyed to, optionally, a mixer where the solids are mixed with other by-products before being conveyed into a dryer.
  • the solids are fed to a desolventizer where the solids are contacted by steam.
  • the flows of steam and solids in the desolventizer may be countercurrent.
  • the solids may then exit the desolventizer and may be fed to a dryer or optionally a mixer where various by-products may be mixed.
  • Vapor exiting the desolventizer may be condensed and optionally mixed with miscella and then fed to a decanter.
  • the water-rich phase exiting the decanter may be fed to a distillation column where hexane is removed from the water-rich stream.
  • the hexane- depleted water rich stream exits the bottom of the distillation column and may be recycled back to the fermentation process, for example, it may be used to slurry the ground corn solids.
  • the overhead and bottom products may be recycled to the fermentation process.
  • the lipid-rich bottoms may be added to the feed of a hydrolyzer.
  • the overheads may be, for example, condensed and fed to a decanter.
  • the hexane rich stream exiting this decanter can optionally be used as part of the solvent feed to the extractor.
  • the water-rich phase exiting this decanter may be fed to the column that strips hexane out of water.
  • the methods of the present invention may be modified in a variety of ways to optimize the fermentation process for the production of a product alcohol such as butanol.
  • by-products may be derived from the mash used in the fermentation process.
  • corn oil may be separated from mash and this corn oil may contain triglycerides, free fatty acids, diglycerides, monoglycerides, and phospholipids (see, e.g., Example 20).
  • the corn oil may optionally be added to other by-products (or co-products) at different rates and thus, for example, creating the ability to vary the amount of triglyceride in the resulting byproduct.
  • the fat content of the resulting by-product could be controlled, for example, to yield a lower fat, high protein animal feed that would better suit the needs of dairy cows compared to a high fat product.
  • crude corn oil separated from mash may be further processed into edible oil for consumer use, or it could also be used as a component of animal feed because its high triglyceride content would make it an excellent source of metabolizable energy. In another embodiment, it could also be used as feedstock for biodiesel or renewable diesel.
  • extractant by-product may be used, all or in part, as a component of an animal feed by-product or it can be used as feedstock for biodiesel or renewable diesel.
  • solids may be separated from mash and may comprise triglycerides and free fatty acids. These solids (or stream) may be used as an animal feed, either recovered as discharge from centrifugation or after drying.
  • the solids (or wet cake) may be particularly suited as feed for ruminants (e.g., dairy cows) because of its high content of available lysine and by-pass or rumen undegradable protein.
  • these solids may be of particular value in a high protein, low fat feed.
  • these solids may be used as a base, that is, other by-products such as syrup may be added to the solids to form a product that may be used as an animal feed.
  • different amounts of other by-products may be added to the solids to tailor the properties of the resulting product to meet the needs of a certain animal species.
  • this composition may include, for example, crude protein, fatty acid, and fatty acid isobutyl esters.
  • this composition (or by-product) may be used, wet or dry, as an animal feed where, for example, a high protein (e.g., high lysine), low fat, and high fiber content is desired.
  • fat may be added to this composition, for example, from another by-product stream if a higher fat, low fiber animal feed is desired.
  • this higher fat, low fiber animal feed may be used for swine or poultry.
  • a non-aqueous composition of Condensed Distillers Solubles may include, for example, protein, fatty acids, and fatty acid isobutyl esters as well as other dissolved and suspended solids such as salts and carbohydrates.
  • This CDS composition may be used, for example, as animal feed, either wet or dry, where a high protein, low fat, high mineral salt feed component is desired. In one embodiment, this composition may be used as a component of a dairy cow ration.
  • oil from the fermentation process may be recovered by evaporation.
  • This non-aqueous composition may comprise fatty acid isobutyl esters and fatty acids (see, e.g., Example 20) and this composition (or stream) may be fed to a hydrolyser to recover isobutanol and fatty acids.
  • this stream may be used as feedstock for biodiesel production.
  • the various streams generated by the production of an alcohol (e.g., butanol) via a fermentation process may be combined in many ways to generate a number of co- products. For example, if crude corn from mash is used to generate fatty acids to be utilized as extractant and lipid is extracted by evaporators for other purposes, then the remaining streams may be combined and processed to create a co-product composition comprising crude protein, crude fat, triglycerides, fatty acid, and fatty acid isobutyl ester.
  • this composition may comprise at least about 20-35 wt% crude protein, at least about 1-20 wt% crude fat, at least about 0-5 wt% triglycerides, at least about 4-10 wt% fatty acid, and at least about 2-6 wt% fatty acid isobutyl ester.
  • the co-product composition may comprise about 25 wt% crude protein, about 10 wt% crude fat, about 0.5 wt% triglycerides, about 6 wt% fatty acid, and about 4 wt% fatty acid isobutyl ester.
  • the lipid is extracted by evaporators and the fatty acids are used for other purposes and about 50 wt% of the crude corn from mash and the remaining streams are combined and processed, the resulting co-product composition may comprise crude protein, crude fat, triglycerides, fatty acid, and fatty acid isobutyl ester. In one embodiment, this composition may comprise at least about 25-31 wt% crude protein, at least about 6-10 wt% crude fat, at least about 4-8 wt% triglycerides, at least about 0-2 wt% fatty acid, and at least about 1-3 wt% fatty acid isobutyl ester.
  • the co-product composition may comprise about 28 wt% crude protein, about 8 wt% crude fat, about 6 wt% triglycerides, about 0.7 wt% fatty acid, and about 1 wt% fatty acid isobutyl ester.
  • the solids separated from whole stillage and 50 wt% of the corn oil extracted from mash are combined and the resulting co-product composition may comprise crude protein, crude fat, triglycerides, fatty acid, fatty acid isobutyl ester, lysine, neutral detergent fiber (NDF), and acid detergent fiber (ADF).
  • the resulting co-product composition may comprise crude protein, crude fat, triglycerides, fatty acid, fatty acid isobutyl ester, lysine, neutral detergent fiber (NDF), and acid detergent fiber (ADF).
  • this composition may comprise at least about 26-34 wt% crude protein, at least about 15-25 wt% crude fat, at least about 12-20 wt% triglycerides, at least about 1- 2 wt% fatty acid, at least about 2-4 wt% fatty acid isobutyl ester, at least about 1-2 wt% lysine, at least about 11-23 wt% NDF, and at least about 5-11 wt% ADF.
  • the co-product composition may comprise about 29 wt% crude protein, about 21 wt% crude fat, about 16 wt% triglycerides, about 1 wt% fatty acid, about 3 wt% fatty acid isobutyl ester, about 1 wt% lysine, about 17 wt% NDF, and about 8 wt% ADF.
  • the high fat, triglyceride, and lysine content and the lower fiber content of this co-product composition may be desirable as feed for swine and poultry.
  • a co-product composition comprising crude protein, crude fat, triglycerides, fatty acid, and fatty acid isobutyl ester.
  • a composition comprising at least about 6% crude fat and at least about 28% crude protein may be utilized as an animal feed product for dairy animals.
  • a composition comprising at least about 6% crude fat and at least about 26% crude protein may be utilized as an animal feed product for feedlot cattle whereas a composition comprising at least about 1% crude fat and at least about 27% crude protein may be utilized as an animal feed product for wintering cattle.
  • a composition comprising at least about 13% crude fat and at least about 27% crude protein may be utilized as an animal feed product for poultry.
  • a composition comprising at least about 18% crude fat and at least about 22% crude protein may be utilized as an animal feed product for monogastric animals.
  • the various streams may be combined in such a way as to customize a feed product for a specific animal species.
  • a co-product composition comprising crude protein, crude fat, triglycerides, fatty acid, and fatty acid isobutyl ester.
  • a composition comprising at least about 6% crude fat and at least about 28% crude protein may be utilized as an animal feed product for dairy animals.
  • a composition comprising at least about 6% crude fat and at least about 26% crude protein may be utilized as an animal feed product for feedlot cattle whereas a composition comprising at least about 1% crude fat and at least about 27% crude protein may be utilized as an animal feed product for wintering cattle.
  • a composition comprising at least about 13% crude fat and at least about 27% crude protein may be utilized as an animal feed product for poultry.
  • a composition comprising at least about 18% crude fat and at least about 22% crude protein may be utilized as an animal feed product for monogastric animals.
  • the various streams may be combined in such a way as to customize a feed product for a specific animal species.
  • one or more streams generated by the production of an alcohol (e.g., butanol) via a fermentation process may be combined in many ways to generate a composition comprising at least about 90% COFA which may be used as fuel source such as biodiesel.
  • milled grain As an example of one embodiment of the methods of the invention, milled grain
  • slurried grain e.g., corn processed by hammer mill
  • one or more enzymes are combined to generate a slurried grain.
  • This slurried grain is cooked, liquified, and flashed with flash vapor resulting in a cooked mash.
  • the cooked mash is then filtered to remove suspended solids, generating a wet cake and a filtrate.
  • the filtration may be accomplished by several methods such as centrifugation, screening, or vacuum filtration and this filtration step may remove at least about 80%> to at least about 99% of the suspended solids from the mash.
  • the wet cake is reslurried with water and refiltered to remove additional starch, generating a washed filter cake.
  • the reslurry process may be repeated a number of times, for example, one to five times.
  • the water used to reslurry the wet cake may be recycled water generated during the fermentation process.
  • the filtrate produced by the reslurry/refiltration process may be returned to the initial mix step to form a slurry with the milled grain.
  • the filtrate may be heated or cooled prior to the mix step.
  • the washed filter cake may be reslurried with beer at a number of stages during the production process.
  • the washed filter cake may be reslurried with beer after the fermentor, before the preflash column, or at the feedpoint to the distillers grain dryer.
  • the washed filter cake may be dried separately from other by-products or may be used directly as wet cake for generation of DDGS.
  • the filtrate produced as a result of the initial mix step may be further processed as described herein.
  • the filtrate may be heated with steam or process to process heat exchange.
  • a saccharification enzyme may be added to the filtrate and the dissolved starch of the filtrate may be partially or completely saccharified.
  • the saccharified filtrate may be cooled by a number of means such as process to process exchange, exchange with cooling water, or exchange with chilled water.
  • the cooled filtrate may then be added to a fermentor as well as a microorganism that is suitable for alcohol production, for example, a recombinant yeast capable of producing butanol.
  • ammonia and recycle streams may also be added to the fermentor.
  • This process may include at least one fermentor, at least two fermentors, at least three fermentors, or at least four fermentors.
  • Carbon dioxide generated during the fermentation may be vented to a scrubber in order to reduce air emissions (e.g., butanol air emissions) and to increase product yield.
  • Solvent may be added to the fermentor via a recycled loop or may be added directly into the fermentor.
  • the solvent may be one or more organic compounds which have the ability to dissolve or react with the alcohol (e.g., butanol) and may have limited solubility in water.
  • the solvent may be taken from the fermentor continually as a single liquid phase or as a two liquid phase material, or the solvent may be withdrawn batchwise as a single or two liquid phase material.
  • Beer may be degassed.
  • the beer may be heated before degassing, for example, by process to process exchange with hot mash or process to process exchange with preflash column overheads. Vapors may be vented to a condenser and then, to a scrubber. Degassed beer may be heated further, for example, by process to process heat exchange with other streams in the distillation area.
  • Preheated beer and solvent may enter a preflash column which may be retrofit from a beer column of a conventional dry grind fuel ethanol plant.
  • This column may be operated at sub-atmospheric pressure, driven by water vapor taken from an evaporator train or from the mash cook step.
  • the overheads of the preflash column may be condensed by heat exchange with some combination of cooling water and process to process heat exchange including heat exchange with the preflash column feed.
  • the liquid condensate may be directed to an alcohol/ water decanter (e.g., butanol/water decanter).
  • the preflash column bottoms may be advanced to a solvent decanter.
  • the preflash column bottoms may be substantially stripped of free alcohol (e.g., butanol).
  • the decanter may be a still well, a centrifuge, or a hydroclone. Water is substantially separated from the solvent phase in this decanter, generating a water phase.
  • the water phase including suspended and dissolved solids may be centrifuged to produce a wet cake and thin stillage.
  • the wet cake may be combined with other streams and dried to produce DDGS, it may be dried and sold separate from other streams which produce DDGS, or it may be sold as a wet cake.
  • the water phase may be split to provide a backset which is used in part to reslurry the filter cake described above. The split also provides thin stillage which may be pumped to evaporators for further processing.
  • the organic phase produced in the solvent decanter may be an ester of an alcohol
  • the solvent may be hydrolyzed to regenerate reactive solvent and to recover additional alcohol (e.g., butanol).
  • additional alcohol e.g., butanol
  • the organic phase may be filtered and sold as a product.
  • Hydrolysis may be thermal driven, homogeneously catalyzed, or heterogeneously catalyzed.
  • the heat input to this process may be a fired heater, hot oil, electrical heat input, or high pressure steam.
  • Water added to drive the hydrolysis may be from a recycled water stream, fresh water, or steam.
  • Cooled hydrolyzed solvent may be pumped into a sub-atmospheric solvent column where it may be substantially stripped of alcohol (e.g., butanol) with steam.
  • This steam may be water vapor from evaporators, it may be steam from the flash step of the mash process, or it may be steam from a boiler (see, e.g., U.S. Patent Application Publication No. 2009/0171129, incorporated herein by reference).
  • a rectifier column from a conventional dry grind ethanol plant may be suitable as a solvent column.
  • the rectifier column may be modified to serve as a solvent column.
  • the bottoms of the solvent column may be cooled, for example, by cooling water or process to process heat exchange. The cooled bottoms may be decanted to remove residual water and this water may be recycled to other steps with the process or recycled to the mash step.
  • the solvent column overheads may be cooled by exchange with cooling water or by process to process heat exchange, and the condensate may be directed to a vented alcohol/ water decanter (e.g., butanol/water decanter) which may be shared with the preflash column overheads.
  • a vented alcohol/ water decanter e.g., butanol/water decanter
  • Other mixed water and alcohol (e.g., butanol) streams may be added to this decanter including the scrubber bottoms and condensate from the degas step.
  • the vent which comprises carbon dioxide, may be directed to a water scrubber.
  • the aqueous layer of this decanter may also be fed to the solvent column or may be stripped of alcohol (e.g., butanol) in a small dedicated distillation column.
  • the aqueous layer may be preheated by process to process exchange with the preflash column overheads, solvent column overheads, or solvent column bottoms.
  • This dedicated column may be modified from the side stripper of a conventional dry grind fuel ethanol process.
  • the organic layer of the alcohol/water decanter e.g., butanol/water decanter
  • the organic layer of the alcohol/water decanter may be pumped to an alcohol (e.g., butanol) column.
  • This column may be a super- atmospheric column and may be driven by steam condensation within a reboiler.
  • the feed to the column may be heated by process to process heat exchange in order to reduce the energy demand to operate the column.
  • This process to process heat exchanger may include a partial condenser of the preflash column, a partial condenser of a solvent column, the product of the hydrolyzer, water vapor from the evaporators, or the butanol column bottoms.
  • the condensate of the alcohol (e.g., butanol) column vapor may be cooled and may be returned to the alcohol/water decanter (e.g., butanol/water decanter).
  • the alcohol (e.g., butanol) column bottoms may be cooled by process to process heat exchange including exchange with the alcohol (e.g., butanol) column feed and may be further cooled with cooling water, filtered, and are sold as product alcohol (e.g., butanol).
  • Thin stillage generated from the preflash column bottoms as described above may be directed to a multiple effect evaporator.
  • This evaporator may have two, three, or more stages.
  • the evaporator may have a configuration of four bodies by two effects similar to the conventional design of a fuel ethanol plant, it may have three bodies by three effects, or it may have other configurations.
  • Thin stillage may enter at any of the effects.
  • At least one of the first effect bodies may be heated with vapor from the super-atmospheric alcohol (e.g., butanol) column. The vapor may be taken from the lowest pressure effect to provide heat in the form of water vapor to the sub-atmospheric preflash column and solvent column. Syrup from the evaporators may be added to the distiller's grain dryer.
  • the super-atmospheric alcohol e.g., butanol
  • a water scrubber e.g., butanol/water decanter
  • the water supplied to the top of this scrubber may be fresh makeup water or may be recycled water.
  • the recycled water may be treated (e.g., biologically digested) to remove volatile organic compounds and may be chilled.
  • Scrubber bottoms may be sent to the alcohol/water decanter (e.g., butanol/water decanter), to the solvent column, or may be used with other recycled water to reslurry the wet cake described above.
  • Condensate from the evaporators may be treated with anaerobic biological digestion or other processes to purify the water before recycling to reslurry the filter cakes.
  • corn oil may be separated from the process streams at any of several points.
  • a centrifuge may be operated to produce a corn oil stream following filtration of the cooked mash or the preflash column water phase centrifuge may be operated to produce a corn oil stream.
  • Intermediate concentration syrup or final syrup may be centrifuged to produce a corn oil stream.
  • the material discharged from the fermentor may be processed in a separation system that involves devices such as a centrifuge, settler, hydrocyclone, etc., and combinations thereof to effect the recovery of live yeast in a concentrated form that can be recycled for reuse in a subsequent fermentation batch either directly or after some re-conditioning.
  • This separation system may also produce an organic stream that comprises fatty esters (e.g. isobutyl fatty esters) and an alcohol (e.g., butanol) produced from the fermentation and an aqueous stream containing only trace levels of immiscible organics.
  • This aqueous stream may be used either before or after it is stripped of the alcohol (e.g., butanol) content to re -pulp and pump the low starch solids that was separated and washed from liquefied mash.
  • This has the advantage of avoiding what might otherwise be a long belt- driven conveying system to transfer these solids from the liquefaction area to the grain drying and syrup blend area.
  • this whole stillage that results after the alcohol (e.g., butanol) has been stripped will need to be separated into thin stillage and wet cake fractions either using existing or new separation devices and this thin stillage will form in part the backset that returns to combine with cook water for preparing a new batch of fermentable mash.
  • any residual dissolved starch that was retained in the moisture of the solids separated from the liquefied mash would in part be captured and recovered through this backset.
  • the yeast contained in the solids stream may be considered nonviable and may be redispersed in the aqueous stream and this combined stream distilled of any alcohol (e.g., butanol) content remaining from fermentation.
  • Non viable organisms may further be separated for use as a nutrient in the propagation process.
  • the multi-phase material may leave the bottom of the preflash column and may be processed in a separation system as described above.
  • the concentrated solids may be redispersed in the aqueous stream and this combined stream may be used to re-pulp and pump the low starch solids that were separated and washed from liquefied mash.
  • the process described above as well as other processes described herein may be demonstrated using computational modeling such as Aspen modeling (see, e.g., U.S. Patent No. 7,666,282).
  • the commercial modeling software Aspen Plus® (Aspen Technology, Inc., Burlington, MA) may be use in conjunction with physical property databases such as DIPPR (Design Institute for Physical Property Research), available from American Institute of Chemical Engineers, Inc. (New York, NY) to develop an Aspen model for an integrated butanol fermentation, purification, and water management process.
  • DIPPR Design Institute for Physical Property Research
  • This process modeling can perform many fundamental engineering calculations, for example, mass and energy balances, vapor/liquid equilibrium, and reaction rate computations.
  • information input may include, for example, experimental data, water content and composition of feedstock, temperature for mash cooking and flashing, saccharification conditions (e.g., enzyme feed, starch conversion, temperature, pressure), fermentation conditions (e.g., microorganism feed, glucose conversion, temperature, pressure), degassing conditions, solvent columns, preflash columns, condensers, evaporators, centrifuges, etc.
  • saccharification conditions e.g., enzyme feed, starch conversion, temperature, pressure
  • fermentation conditions e.g., microorganism feed, glucose conversion, temperature, pressure
  • degassing conditions e.g., solvent columns, preflash columns, condensers, evaporators, centrifuges, etc.
  • the processes and systems described above can lead to increased extraction activity and/or efficiency in the product alcohol production as a result of the removal of the undissolved solids.
  • extractive fermentation without the presence of the undissolved solids can lead to higher mass transfer rate of the product alcohol from the fermentation broth to the extractant, better phase separation of the extractant from the fermentation inside or external to the fermentor, and lower hold up of the extractant as a result of higher extractant droplet rise velocities.
  • the extractant droplets held up in the fermentation broth during fermentation will disengage from the fermentation broth faster and more completely, thereby resulting in less free extractant in the fermentation broth and can decrease the amount of extractant lost in the process.
  • the microorganism can be recycled and additional equipment in the downstream processing can be eliminated, such as for example, a beer column and/or some or all of the whole stillage centrifuges. Further, for example, the possibility of extractant being lost in the DDGS is removed. Also, for example, the ability to recycle the microorganism can increase the overall rate of product alcohol production, lower the overall titer requirement, and/or lower the aqueous titer requirement, thereby leading to a healthier microorganism and a higher production rate.
  • Examples of increased extraction efficiency can include, for example, a stabilized partition coefficient, enhanced (e.g., quicker or more complete) phase separation, enhanced liquid-liquid mass transfer coefficient, operation at a lower titer, increased process stream recyclability, increased fermentation volume efficiency, increased feedstock (e.g., corn) load feeding, increased butanol titer tolerance of the microorganism (e.g., a recombinant microorganism), water recycling, reduction in energy, increased recycling of extractant, and/or recycling of the microorganism.
  • a stabilized partition coefficient e.g., enhanced (e.g., quicker or more complete) phase separation, enhanced liquid-liquid mass transfer coefficient, operation at a lower titer, increased process stream recyclability, increased fermentation volume efficiency, increased feedstock (e.g., corn) load feeding, increased butanol titer tolerance of the microorganism (e.g., a recombinant microorganism), water recycling, reduction in energy, increased recycling of
  • the volume of the fermentor taken up by solids will be decreased.
  • the effective volume of the fermentor available for the fermentation can be increased.
  • the volume of the fermentor available for the fermentation is increased by at least about 10%.
  • partition coefficient there can be a stabilization in partition coefficient. Because the corn oil in the fermentor can be reduced by removing the solids from the feedstock slurry prior to fermentation, the extractant is exposed to less corn oil which combines with the extractant and may lower the partition coefficient if present in sufficient amount. Therefore, reduction of the corn oil introduced into the fermentor results in a more stable partition coefficient of the extractant phase in the fermentor. In some embodiments, the partition coefficient is decreased by less than about 10% over 10 fermentation cycles.
  • the mass transfer coefficient is increased at least 2-fold (see Examples 4 and 5).
  • phase separation there can be an increase in phase separation between the fermentation broth and the extractant that reduces the likelihood of the formation of an emulsion, thereby resulting in an increased efficiency of product alcohol production.
  • the phase separation can occur more quickly or can be more complete.
  • a phase separation may occur where previously no appreciable phase separation was observed in 24 hours.
  • the phase separation occurs at least about 2x as quickly, at least about 5x as quickly, or at least about lOx as quickly as compared to the phase separation where solids have not been removed (see Examples 6 and 7).
  • the extractant will not be "trapped" in the solids which may ultimately be removed as DDGS, thereby resulting in an increased efficiency of product alcohol production (see Examples 8 and 9). Also, there will be less dilution of the extractant with corn oil, and there may be less degradation of the extractant (see Example 10).
  • the flow rate of the extractant can be reduced which will lower operating costs, thereby resulting in an increased efficiency of product alcohol production.
  • an agitator can be removed from the fermentor because it is no longer needed to suspend the undissolved solids, thereby reducing capital costs and energy, and increasing the efficiency of the product alcohol production.
  • fermentation broth 40 can be discharged from an outlet in fermentor 30.
  • the absence or minimization of the undissolved solids exiting fermentor 30 with fermentation broth 40 has several additional benefits. For example, the need for units and operations in the downstream processing can be eliminated such as, for example, a beer column or distillation column, thereby resulting in an increased efficiency for the product alcohol production.
  • the undissolved solids are not present in fermentation broth 40 exiting fermentor 30, there is no DDGS formed with "trapped" extractant. Also, some or all of the whole stillage centrifuges may be eliminated as a result of less undissolved solids in the final broth exiting the fermentor.
  • the methods of the present invention provide a number of benefits that can result in improved production (e.g., batch or continuous) of a product alcohol such as butanol.
  • a product alcohol such as butanol.
  • the improvement in mass transfer enables operation at a lower aqueous titer resulting in a "healthier" microorganism.
  • a better phase separation can lead to improved fermentor volume efficiency as well as the possibility of processing less reactor contents through beer columns, distillation columns, etc.
  • the methods of the present invention may also provide a higher quality of DDGS.
  • the methods described herein provide for the removal of oil (e.g., corn oil) prior to fermentation which would then allow the controlled addition of oil to the fermentation. Furthermore, the removal of oil prior to fermentation would allow some flexibility in the amount of oil present in DDGS. That is, oil may be added in different amounts to DDGS resulting in the production of DDGS with different fat contents depending on the nutritional needs of a particular animal species.
  • oil e.g., corn oil
  • Alcohol-producing microorganisms are known in the art.
  • fermentative oxidation of methane by methanotrophic bacteria produces methanol, and contacting methanol (a C ⁇ alkyl alcohol) with a carboxylic acid and a catalyst capable of esterifying the carboxylic acid with methanol forms a methanol ester of the carboxylic acid.
  • the yeast strain CEN.PK113-7D (CBS 8340, the Centraal Buro voor Schimmelculture; van Dijken, et al., Enzyme Microb. Techno. 26:706-714, 2000) can produce ethanol, and contacting ethanol with a carboxylic acid and a catalyst capable of esterifying the carboxylic acid with the ethanol forms ethyl ester (see, e.g., Example 36).
  • Suitable recombinant microorganisms capable of producing butanol are known in the art, and certain suitable microorganisms capable of producing butanol are described herein.
  • Recombinant microorganisms to produce butanol via a biosynthetic pathway can include a member of the genera Clostridium, Zymomonas, Escherichia, Salmonella, Serratia, Erwinia, Klebsiella, Shigella, Rhodococcus, Pseudomonas, Bacillus, Lactobacillus, Enterococcus, Alcaligenes, Klebsiella, Paenibacillus, Arthrobacter, Corynebacterium, Brevibacterium, Schizosaccharomyces, Kluyveromyces, Yarrowia, Pichia, Candida, Hansenula, Issatchenkia, or Saccharomyces.
  • recombinant microorganisms can be selected from the group consisting of Escherichia coli, Lactobacillus plantarum, Kluyveromyces lactis, Kluyveromyces marxianus and Saccharomyces cerevisiae.
  • the recombinant microorganism is yeast.
  • the recombinant microorganism is crabtree-positive yeast selected from Saccharomyces, Zygosaccharomyces, Schizosaccharomyces, Dekkera, Torulopsis, Brettanomyces, and some species of Candida.
  • Species of crabtree-positive yeast include, but are not limited to, Saccharomyces cerevisiae, Saccharomyces kluyveri, Schizosaccharomyces pombe, Saccharomyces bayanus, Saccharomyces mikitae, Saccharomyces paradoxus, Zygosaccharomyces rouxii, and Candida glabrata.
  • the host cell is Saccharomyces cerevisiae.
  • S. cerevisiae yeast are known in the art and are available from a variety of sources including, but not limited to, American Type Culture Collection (Rockville, MD), Centraalbureau voor Schimmelcultures (CBS) Fungal Biodiversity Centre, LeSaffre, Gert Strand AB, Ferm Solutions, North American Bioproducts, Martrex, and Lallemand. S.
  • cerevisiae include, but are not limited to, BY4741, CEN.PK 113-7D, Ethanol Red® yeast, Ferm ProTM yeast, Bio-Ferm® XR yeast, Gert Strand Prestige Batch Turbo alcohol yeast, Gert Strand Pot Distillers yeast, Gert Strand Distillers Turbo yeast, FerMaxTM Green yeast, FerMaxTM Gold yeast, Thermosacc® yeast, BG-1, PE-2, CAT-1, CBS7959, CBS7960, and CBS7961.
  • microorganisms comprise a butanol biosynthetic pathway.
  • at least one, at least two, at least three, or at least four polypeptides catalyzing substrate to product conversions of a pathway are encoded by heterologous polynucleotides in the microorganism.
  • all polypeptides catalyzing substrate to product conversions of a pathway are encoded by heterologous polynucleotides in the microorganism.
  • the microorganism comprises a reduction or elimination of pyruvate decarboxylase activity.
  • Microorganisms substantially free of pyruvate decarboxylase activity are described in US Application Publication No. 2009/0305363, herein incorporated by reference.
  • Microorganisms substantially free of an enzyme having NAD-dependent glycerol-3 -phosphate dehydrogenase activity such as GPD2 are also described therein.
  • Suitable biosynthetic pathways for production of butanol are known in the art, and certain suitable pathways are described herein.
  • the butanol biosynthetic pathway comprises at least one gene that is heterologous to the host cell. In some embodiments, the butanol biosynthetic pathway comprises more than one gene that is heterologous to the host cell. In some embodiments, the butanol biosynthetic pathway comprises heterologous genes encoding polypeptides corresponding to every step of a biosynthetic pathway.
  • percent identities include, but are not limited to, 75%, 80%, 85%, 90%, or 95%, or any integer percentage from 75% to 100%) may be useful in describing the present invention such as 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%.
  • Suitable strains include those described in certain applications cited and incorporated by reference herein as well as in U.S. Provisional Application Serial No. 61/380,563, filed on September 7, 2010. Construction of certain suitable strains including those used in the Examples, is provided herein.
  • strain BP1064 was derived from CEN.PK 113-7D (CBS 8340;
  • Centraalbureau voor Schimmelcultures (CBS) Fungal Biodiversity Centre, Netherlands) and contains deletions of the following genes: URA3, HIS3, PDC1, PDC5, PDC6, and GPD2.
  • BP 1064 was transformed with plasmids pYZ090 (SEQ ID NO: 1, described in U.S. Provisional Application Serial No. 61/246,844) and pLH468 (SEQ ID NO: 2) to create strain NGCI-070 (BP1083, PNY1504).
  • Deletions which completely removed the entire coding sequence, were created by homologous recombination with PCR fragments containing regions of homology upstream and downstream of the target gene and either a G418 resistance marker or URA3 gene for selection of transformants.
  • the G418 resistance marker flanked by loxP sites, was removed using Cre recombinase.
  • the URA3 gene was removed by homologous recombination to create a scarless deletion or if flanked by loxP sites, was removed using Cre recombinase.
  • the PCR cassette for each scarless deletion was made by combining four fragments, A-B-U-C, by overlapping PCR.
  • the PCR cassette contained a selectable/counter-selectable marker, URA3 (Fragment U), consisting of the native CEN.PK 113-7D URA3 gene, along with the promoter (250 bp upstream of the URA3 gene) and terminator (150 bp downstream of the URA3 gene).
  • Fragments A and C each 500 bp long, corresponded to the 500 bp immediately upstream of the target gene (Fragment A) and the 3' 500 bp of the target gene (Fragment C).
  • Fragments A and C were used for integration of the cassette into the chromosome by homologous recombination.
  • Fragment B (500 bp long) corresponded to the 500 bp immediately downstream of the target gene and was used for excision of the URA3 marker and Fragment C from the chromosome by homologous recombination, as a direct repeat of the sequence corresponding to Fragment B was created upon integration of the cassette into the chromosome.
  • the URA3 marker was first integrated into and then excised from the chromosome by homologous recombination. The initial integration deleted the gene, excluding the 3' 500 bp. Upon excision, the 3' 500 bp region of the gene was also deleted.
  • the gene to be integrated was included in the PCR cassette between fragments A and B.
  • a ura3::loxP-kanMX-loxP cassette was PCR-amplified from pLA54 template DNA (SEQ ID NO: 3).
  • pLA54 contains the K. lactis TEF1 promoter and kanMX marker, and is flanked by loxP sites to allow recombination with Cre recombinase and removal of the marker.
  • PCR was done using Phusion® DNA polymerase (New England BioLabs Inc., Ipswich, MA) and primers BK505 and BK506 (SEQ ID NOs: 4 and 5).
  • each primer was derived from the 5' region upstream of the URA3 promoter and 3' region downstream of the coding region such that integration of the loxP-kanMX-loxP marker resulted in replacement of the URA3 coding region.
  • the PCR product was transformed into CEN.PK 113-7D using standard genetic techniques (Methods in Yeast Genetics, 2005, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, pp. 201-202) and transformants were selected on YPD containing G418 (100 ⁇ g/mL) at 30°C. Transformants were screened to verify correct integration by PCR using primers LA468 and LA492 (SEQ ID NOs: 6 and 7) and designated CEN.PK 113-7D Aura3 : :kanMX. HIS3 Deletion
  • HIS3 Fragment A was amplified with primer oBP452 (SEQ ID NO: 14) and primer oBP453 (SEQ ID NO: 15) containing a 5' tail with homology to the 5' end of HIS3 Fragment B.
  • HIS3 Fragment B was amplified with primer oBP454 (SEQ ID NO: 16) containing a 5' tail with homology to the 3' end of HIS3 Fragment A, and primer oBP455 (SEQ ID NO: 17) containing a 5' tail with homology to the 5' end of HIS3 Fragment U.
  • HIS3 Fragment U was amplified with primer oBP456 (SEQ ID NO: 18) containing a 5' tail with homology to the 3' end of HIS3 Fragment B, and primer oBP457 (SEQ ID NO: 19) containing a 5' tail with homology to the 5' end of HIS3 Fragment C.
  • HIS3 Fragment C was amplified with primer oBP458 (SEQ ID NO: 20) containing a 5' tail with homology to the 3' end of HIS3 Fragment U, and primer oBP459 (SEQ ID NO: 21). PCR products were purified with a PCR Purification kit (Qiagen, Valencia, CA). HIS3 Fragment AB was created by overlapping PCR by mixing HIS3 Fragment A and HIS3 Fragment B and amplifying with primers oBP452 (SEQ ID NO: 14) and oBP455 (SEQ ID NO: 17).
  • HIS3 Fragment UC was created by overlapping PCR by mixing HIS3 Fragment U and HIS3 Fragment C and amplifying with primers oBP456 (SEQ ID NO: 18) and oBP459 (SEQ ID NO: 21).
  • the resulting PCR products were purified on an agarose gel followed by a Gel Extraction kit (Qiagen, Valencia, CA).
  • the HIS3 ABUC cassette was created by overlapping PCR by mixing HIS3 Fragment AB and HIS3 Fragment UC and amplifying with primers oBP452 (SEQ ID NO: 14) and oBP459 (SEQ ID NO: 21).
  • the PCR product was purified with a PCR Purification kit (Qiagen, Valencia, CA).
  • Competent cells of CEN.PK 113-7D Aura3::kanMX were made and transformed with the HIS3 ABUC PCR cassette using a Frozen-EZ Yeast Transformation IITM kit (Zymo Research Corporation, Irvine, CA). Transformation mixtures were plated on synthetic complete media lacking uracil supplemented with 2% glucose at 30°C. Transformants with a his3 knockout were screened for by PCR with primers oBP460 (SEQ ID NO: 22) and oBP461 (SEQ ID NO: 23) using genomic DNA prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA). A correct transformant was selected as strain CEN.PK 113-7D Aura3::kanMX Ahis3::URA3.
  • the KanMX marker was removed by transforming CEN.PK 113-7D
  • Aura3::kanMX Ahis3::URA3 with pRS423::PGALl-cre (SEQ ID NO: 66, described in U.S. Provisional Application No. 61/290,639) using a Frozen-EZ Yeast Transformation IITM kit (Zymo Research Corporation, Irvine, CA) and plating on synthetic complete medium lacking histidine and uracil supplemented with 2% glucose at 30°C.
  • Trans formants were grown in YP supplemented with 1% galactose at 30°C for ⁇ 6 hours to induce the Cre recombinase and KanMX marker excision and plated onto YPD (2% glucose) plates at 30°C for recovery.
  • a correct isolate that was sensitive to G418 and auxotrophic for uracil and histidine was selected as strain CEN.PK 113-7D Aura3::loxP Ahis3 and designated as BP857.
  • the deletions and marker removal were confirmed by PCR and sequencing with primers oBP450 (SEQ ID NO: 24) and oBP451 (SEQ ID NO: 25) for Aura3 and primers oBP460 (SEQ ID NO: 22) and oBP461 (SEQ ID NO: 23) for Ahis3 using genomic DNA prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA).
  • the four fragments for the PCR cassette for the scarless PDC6 deletion were amplified using Phusion® High Fidelity PCR Master Mix (New England BioLabs Inc., Ipswich, MA) and CEN.PK 113-7D genomic DNA as template, prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA).
  • PDC6 Fragment A was amplified with primer oBP440 (SEQ ID NO: 26) and primer oBP441 (SEQ ID NO: 27) containing a 5' tail with homology to the 5' end of PDC6 Fragment B.
  • PDC6 Fragment B was amplified with primer oBP442 (SEQ ID NO: 28), containing a 5' tail with homology to the 3' end of PDC6 Fragment A, and primer oBP443 (SEQ ID NO: 29) containing a 5' tail with homology to the 5' end of PDC6 Fragment U.
  • PDC6 Fragment U was amplified with primer oBP444 (SEQ ID NO: 30) containing a 5' tail with homology to the 3' end of PDC6 Fragment B, and primer oBP445 (SEQ ID NO: 31) containing a 5' tail with homology to the 5' end of PDC6 Fragment C.
  • PDC6 Fragment C was amplified with primer oBP446 (SEQ ID NO: 32) containing a 5' tail with homology to the 3' end of PDC6 Fragment U, and primer oBP447 (SEQ ID NO: 33). PCR products were purified with a PCR Purification kit (Qiagen, Valencia, CA). PDC6 Fragment AB was created by overlapping PCR by mixing PDC6 Fragment A and PDC6 Fragment B and amplifying with primers oBP440 (SEQ ID NO: 26) and oBP443 (SEQ ID NO: 29).
  • PDC6 Fragment UC was created by overlapping PCR by mixing PDC6 Fragment U and PDC6 Fragment C and amplifying with primers oBP444 (SEQ ID NO: 30) and oBP447 (SEQ ID NO: 33). The resulting PCR products were purified on an agarose gel followed by a Gel Extraction kit (Qiagen, Valencia, CA).
  • the PDC6 ABUC cassette was created by overlapping PCR by mixing PDC6 Fragment AB and PDC6 Fragment UC and amplifying with primers oBP440 (SEQ ID NO: 26) and oBP447 (SEQ ID NO: 33). The PCR product was purified with a PCR Purification kit (Qiagen, Valencia, CA).
  • Competent cells of CEN.PK 113-7D Aura3::loxP Ahis3 were made and transformed with the PDC6 ABUC PCR cassette using a Frozen-EZ Yeast Transformation IITM kit (Zymo Research Corporation, Irvine, CA). Transformation mixtures were plated on synthetic complete media lacking uracil supplemented with 2% glucose at 30°C. Transformants with a pdc6 knockout were screened for by PCR with primers oBP448 (SEQ ID NO: 34) and oBP449 (SEQ ID NO: 35) using genomic DNA prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA). A correct transformant was selected as strain CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6::URA3.
  • CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6::URA3 was grown overnight in YPD and plated on synthetic complete medium containing 5-fluoro-orotic acid (0.1%) at 30°C to select for isolates that lost the URA3 marker.
  • the deletion and marker removal were confirmed by PCR and sequencing with primers oBP448 (SEQ ID NO: 34) and oBP449 (SEQ ID NO: 35) using genomic DNA prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA).
  • Streptococcus mutans ATCC No. 700610 ATCC No. 700610.
  • the A fragment followed by the ilvD coding region from Streptococcus mutans for the PCR cassette for the PDCl deletion-ilvDSm integration was amplified using Phusion® High Fidelity PCR Master Mix (New England BioLabs Inc., Ipswich, MA) and NYLA83 genomic DNA as template, prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA).
  • NYLA83 is a strain (construction described in U.S. App. Pub. NO. 20110124060, incorporated herein by reference in its entirety) which carries the PDC1 deletion-ilvDSm integration described in U.S. Patent Application Publication No.
  • PDC1 Fragment A-ilvDSm (SEQ ID NO: 69) was amplified with primer oBP513 (SEQ ID NO: 38) and primer oBP515 (SEQ ID NO: 39) containing a 5' tail with homology to the 5' end of PDC1 Fragment B.
  • the B, U, and C fragments for the PCR cassette for the PDC1 deletion-ilvDSm integration were amplified using Phusion® High Fidelity PCR Master Mix (New England BioLabs Inc., Ipswich, MA) and CEN.PK 113- 7D genomic DNA as template, prepared with a Gentra® Puregene® Yeast/Bact.
  • PDC1 Fragment B was amplified with primer oBP516 (SEQ ID NO: 40) containing a 5' tail with homology to the 3' end of PDC1 Fragment A-ilvDSm, and primer oBP517 (SEQ ID NO: 41) containing a 5' tail with homology to the 5' end of PDC1 Fragment U.
  • PDC1 Fragment U was amplified with primer oBP518 (SEQ ID NO: 42) containing a 5' tail with homology to the 3' end of PDC1 Fragment B, and primer oBP519 (SEQ ID NO: 43) containing a 5' tail with homology to the 5' end of PDC1 Fragment C.
  • PDC1 Fragment C was amplified with primer oBP520 (SEQ ID NO: 44), containing a 5' tail with homology to the 3' end of PDC1 Fragment U, and primer oBP521 (SEQ ID NO: 45).
  • PCR products were purified with a PCR Purification kit (Qiagen, Valencia, CA.
  • PDC1 Fragment A-ilvDSm-B was created by overlapping PCR by mixing PDC1 Fragment A-ilvDSm and PDC1 Fragment B and amplifying with primers oBP513 (SEQ ID NO: 38) and oBP517 (SEQ ID NO: 41).
  • PDC1 Fragment UC was created by overlapping PCR by mixing PDC1 Fragment U and PDC1 Fragment C and amplifying with primers oBP518 (SEQ ID NO: 42) and oBP521 (SEQ ID NO: 45). The resulting PCR products were purified on an agarose gel followed by a Gel Extraction kit (Qiagen, Valencia, CA).
  • the PDC1 A-ilvDSm-BUC cassette (SEQ ID NO: 70) was created by overlapping PCR by mixing PDC1 Fragment A-ilvDSm-B and PDC1 Fragment UC and amplifying with primers oBP513 (SEQ ID NO: 38) and oBP521 (SEQ ID NO: 45).
  • the PCR product was purified with a PCR Purification kit (Qiagen, Valencia, CA).
  • Competent cells of CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6 were made and transformed with the PDCl A-ilvDSm-BUC PCR cassette using a Frozen-EZ Yeast Transformation IITM kit (Zymo Research Corporation, Irvine, CA).
  • Transformation mixtures were plated on synthetic complete media lacking uracil supplemented with 2% glucose at 30°C.
  • Transformants with a pdcl knockout ilvDSm integration were screened for by PCR with primers oBP511 (SEQ ID NO: 46) and oBP512 (SEQ ID NO: 47) using genomic DNA prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA).
  • the absence of the PDCl gene from the isolate was demonstrated by a negative PCR result using primers specific for the coding sequence of PDCl, oBP550 (SEQ ID NO: 48) and oBP551 (SEQ ID NO: 49).
  • a correct transformant was selected as strain CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm-URA3.
  • CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm-URA3 was grown overnight in YPD and plated on synthetic complete medium containing 5-fluoro-orotic acid (0.1%) at 30°C to select for isolates that lost the URA3 marker.
  • the deletion of PDCl, integration of ilvDSm, and marker removal were confirmed by PCR and sequencing with primers oBP511 (SEQ ID NO: 46) and oBP512 (SEQ ID NO: 47) using genomic DNA prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA). The correct isolate was selected as strain CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm and designated as BP907.
  • Achromobacter xylosoxidans A segment of the PCR cassette for the PDC5 deletion- sadB integration was first cloned into plasmid pUC19-URA3MCS.
  • pUC 19-URA3MCS is pUC 19 based and contains the sequence of the URA3 gene from Saccaromyces cerevisiae situated within a multiple cloning site (MCS).
  • pUC19 contains the pMBl replicon and a gene coding for beta-lactamase for replication and selection in Escherichia coli.
  • the sequences from upstream and downstream of this gene were included for expression of the URA3 gene in yeast.
  • the vector can be used for cloning purposes and can be used as a yeast integration vector.
  • Genomic DNA was prepared using a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA).
  • the PCR product and pUC19 were ligated with T4 DNA ligase after digestion with BamHI and Xbal to create vector pUC19-URA3MCS.
  • the vector was confirmed by PCR and sequencing with primers oBP264 (SEQ ID NO: 10) and oBP265 (SEQ ID NO: 11).
  • URA3MCS to create the sadB-BU portion of the PDC5 A-sadB-BUC PCR cassette.
  • the coding sequence of sadB was amplified using pLH468-sadB (SEQ ID NO: 67) as template with primer oBP530 (SEQ ID NO: 50) containing an AscI restriction site, and primer oBP531 (SEQ ID NO: 51) containing a 5' tail with homology to the 5' end of PDC5 Fragment B.
  • PDC5 Fragment B was amplified with primer oBP532 (SEQ ID NO: 52) containing a 5' tail with homology to the 3' end of sadB, and primer oBP533 (SEQ ID NO: 53) containing a Pmel restriction site. PCR products were purified with a PCR Purification kit (Qiagen, Valencia, CA). sadB-PDC5 Fragment B was created by overlapping PCR by mixing the sadB and PDC5 Fragment B PCR products and amplifying with primers oBP530 (SEQ ID NO: 50) and oBP533 (SEQ ID NO: 53).
  • the resulting PCR product was digested with AscI and Pmel and ligated with T4 DNA ligase into the corresponding sites of pUC19-URA3MCS after digestion with the appropriate enzymes.
  • the resulting plasmid was used as a template for amplification of sadB- Fragment B-Fragment U using primers oBP536 (SEQ ID NO: 54) and oBP546 (SEQ ID NO: 55) containing a 5' tail with homology to the 5' end of PDC5 Fragment C.
  • PDC5 Fragment C was amplified with primer oBP547 (SEQ ID NO: 56) containing a 5' tail with homology to the 3' end of PDC5 sadB-Fragment B-Fragment U, and primer oBP539 (SEQ ID NO: 57).
  • PCR products were purified with a PCR Purification kit (Qiagen, Valencia, CA).
  • PDC5 sadB-Fragment B-Fragment U-Fragment C was created by overlapping PCR by mixing PDC5 sadB-Fragment B-Fragment U and PDC5 Fragment C and amplifying with primers oBP536 (SEQ ID NO: 54) and oBP539 (SEQ ID NO: 57).
  • the resulting PCR product was purified on an agarose gel followed by a Gel Extraction kit (Qiagen, Valencia, CA).
  • the PDC5 A-sadB-BUC cassette (SEQ ID NO: 72) was created by amplifying PDC5 sadB-Fragment B-Fragment U-Fragment C with primers oBP542 (SEQ ID NO: 58) containing a 5' tail with homology to the 50 nucleotides immediately upstream of the native PDC5 coding sequence, and oBP539 (SEQ ID NO: 57).
  • the PCR product was purified with a PCR Purification kit (Qiagen, Valencia, CA).
  • Competent cells of CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm were made and transformed with the PDC5 A-sadB-BUC PCR cassette using a Frozen- EZ Yeast Transformation IITM kit (Zymo Research Corporation, Irvine, CA). Transformation mixtures were plated on synthetic complete media lacking uracil supplemented with 1% ethanol (no glucose) at 30°C.
  • Transformants with a pdc5 knockout sadB integration were screened for by PCR with primers oBP540 (SEQ ID NO: 59) and oBP541 (SEQ ID NO: 60) using genomic DNA prepared with a Gentra® Puregene® Yeast/Bact. kit (Qiagen, Valencia, CA).
  • the absence of the PDC5 gene from the isolate was demonstrated by a negative PCR result using primers specific for the coding sequence of PDC5, oBP552 (SEQ ID NO: 61) and oBP553 (SEQ ID NO: 62).
  • a correct transformant was selected as strain CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm Apdc5::sadB-URA3.
  • CEN.PK 113-7D Aura3::loxP
  • Apdc5::sadB-URA3 was grown overnight in YPE (1% ethanol) and plated on synthetic complete medium supplemented with ethanol (no glucose) and containing 5-fluoro-orotic acid (0.1%) at 30°C to select for isolates that lost the URA3 marker.
  • the deletion of PDC5, integration of sadB, and marker removal were confirmed by PCR with primers oBP540 (SEQ ID NO: 59) and oBP541 (SEQ ID NO: 60) using genomic DNA prepared with a Gentra® Puregene® Yeast/Bact.
  • 1OXP-URA3-1OXP (SEQ ID NO: 68) was PCR-amplified using 1OXP-URA3-1OXP (SEQ ID NO: 68) as template DNA.
  • 1OXP-URA3-1OXP contains the URA3 marker from (ATCC No. 77107) flanked by loxP recombinase sites. PCR was done using Phusion® DNA polymerase (New England BioLabs Inc., Ipswich, MA) and primers LA512 and LA513 (SEQ ID NOs: 8 and 9).
  • the GPD2 portion of each primer was derived from the 5' region upstream of the GPD2 coding region and 3' region downstream of the coding region such that integration of the loxP-URA3-loxP marker resulted in replacement of the GPD2 coding region.
  • the PCR product was transformed into BP913 and transformants were selected on synthetic complete media lacking uracil supplemented with 1% ethanol (no glucose). Transformants were screened to verify correct integration by PCR using primers oBP582 and AA270 (SEQ ID NOs: 63 and 64).
  • the correct isolate was selected as strain CEN.PK 113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm Apdc5::sadB Agpd2::loxP and designated as PNY1503 (BP1064).
  • BP 1064 was transformed with plasmids pYZ090 (SEQ ID NO: 1) and pLH468
  • the corn used was whole kernel yellow corn from Pioneer (3335). It was ground in a hammer-mill using a 1 mm screen. The moisture content of the ground corn was measured to be 12 wt%, and the starch content of the ground corn was measured to be 71.4 wt% on a dry corn basis.
  • the alpha-amylase enzyme was Liquozyme® SC DS available from Novozymes (Franklinton, NC). The total amounts of the ingredients used for all three batches combined were: 33.9 kg of ground corn (12% moisture), 65.4 kg of tap water, and 0.006 kg of Liquozyme® SC DS. A total of 0.297 kg of NaOH (17 wt%) was added to control pH. No H 2 SO 4 was required. The total amount of liquefied corn mash recovered from the three 30 L batches was 99.4 kg.
  • centrate recovered directly from the centrifuge would have contained approximately 23 wt% dissolved oligosaccharides (liquefied starch).
  • About 0.6 kg of z ' -BuOH was added to 35.4 kg of centrate to preserve it.
  • the diluted centrate was prepared as follows: 18 kg of the centrate stock solution from Example 2 which contained 1.6 wt% z ' -BuOH, was mixed with 18 kg of tap water and 0.82 kg of z ' -BuOH was added. The resulting 36.8 kg solution of diluted centrate consisted of approximately 11 wt% oligosaccharides and approximately 30 g/L of i- BuOH. This solution mimics the liquid phase of a corn mash fermentation (SSF) at approximately 50% conversion of the oligosaccharides and an aqueous titer of 30 g/L i- BuOH.
  • SSF corn mash fermentation
  • Mass transfer tests were conducted using the solution obtained in Example 3 as the aqueous phase to mimic mass transfer performance in a broth derived from liquefied corn mash after most of the undissolved solids are removed.
  • the objective of the mass transfer tests was to measure the effect of undissolved solids on the overall volumetric mass transfer coefficient for the transfer of z ' -BuOH from a simulated broth, derived from liquefied corn mash, to a dispersion of solvent (extractant) droplets rising up through the simulated broth. Correlations of k L a with key design of operating parameters can be used to scale up mass transfer operations.
  • Examples of parameters that should be held constant as much as possible in order to generate correlations of ⁇ a from smaller scale data which are useful for scale up are the physical properties of both phases and design parameters that determine droplet size (e.g., nozzle diameter, velocity of the phase to be dispersed through the nozzle).
  • a 6 inch diameter, 7 foot tall glass, jacketed column was used to measure the k L a for the transfer of z ' -BuOH from an aqueous solution of oligosaccharides (derived from liquefied corn mash), both with and without suspended mash solids, to a dispersion of oleyl alcohol (OA) droplets rising up through the simulated broth.
  • OA oleyl alcohol
  • a certain amount of the aqueous phase (typically about 35 kg) which contained approximately 11 wt% oligosaccharides and approximately 30 g/L of z ' -BuOH, was charged to the column, and the column was heated to 30°C by flowing warm H 2 0 through the jacket. There was no flow of aqueous phase in or out of the column during the test.
  • Fresh oleyl alcohol 80/85% grade from Cognis was sparged into the bottom of the column through a single nozzle to create a dispersion of extractant droplets which flowed up through the aqueous phase. After reaching the top of the aqueous phase, the extractant drops formed a separate organic phase which then overflowed from the top of the column and was collected into a receiver. Typically, 3 to 5 gallons of OA flowed through the column for a single test.
  • nozzle size and nozzle velocity were varied to observe their effects on the k L a.
  • a series of tests were done using an aqueous solution of oligosaccharides (diluted centrate obtained from liquefied corn mash) with the mash solids removed.
  • a similar series of tests were done using the same aqueous solution of oligosaccharides after adding the mash solids back to simulate liquefied corn mash (including the undissolved solids) at the middle of SSF.
  • ⁇ total mass of z ' -BuOH transferred from the aqueous phase to the solvent phase per unit time per unit volume of the aqueous phase, grams z ' -BuOH/Liter aqueous phase/hr or g/L/hr.
  • k L a overall volumetric mass transfer coefficient describing the mass transfer of z ' -BuOH from the aqueous phase to the solvent phase, hr "1 .
  • C B ,broth average concentration of z ' -BuOH in the simulated broth (aqueous) phase over the entire test, grams z ' -BuOH/Liter aqueous phase or g/L.
  • K B average equilibrium distribution coefficient for z ' -BuOH between the solvent and aqueous phase, (grams z ' -BuOH/Liter solvent phase)/(grams z ' -BuOH/Liter aqueous phase).
  • the parameters r B , C B ,broth, and C B , so ivent were calculated for each test from the concentration data obtained from the samples of the aqueous and solvent phases.
  • the parameter K B was independently measured by mixing aqueous centrate from liquefied corn mash, OA, and z ' -BuOH and vigorously mixing the system until the two liquid phases were at equilibrium. The concentration of z ' -BuOH was measured in both phases to determine K B .
  • the k L a could be calculated by rearranging Equation (1):
  • Mass transfer tests were conducted with two different size nozzles at nozzle velocities ranging from 5 ft/s to 21 ft/s using the diluted centrate (solids removed) as the aqueous phase. Three tests were done using a nozzle that has an inner diameter (ID) of 0.76 mm, and three tests were done using a nozzle that has an ID of 2.03 mm. All tests were conducted at 30°C in the 6 inch diameter column described above using OA as the solvent. The equilibrium distribution coefficient for z ' -BuOH between OA and the diluted centrate which was obtained from liquefied corn mash by removing the solids, was measured to be approximately 5. The results of the mass transfer tests using diluted centrate (with the solids removed) are shown in Table 1.
  • volume of Aqueous Phase, L 36.0 35.0 34.3 32.0 28.0 28.6
  • Nozzle I.D., mm 0.76 0.76 0.76 2.03 2.03 2.03
  • Example 2 (containing undissolved solids) half way through SSF was synthesized by adding some of the wet cake from Example 2 (which was initially obtained from removing the solids from liquefied corn mash) to diluted centrate (which was used for the mass transfer tests describe above in Example 4). Some water was also added to dilute the liquid phase held up in the wet cake because this liquid has the same composition as the concentrated centrate.
  • This slurry mimics the composition of a fermentation broth half way through SSF of corn to z ' -BuOH at approximately 30% corn loadings because the level of undissolved solids and oligosaccharides found in these types of broths is approximately 6-8 wt% and 10-12 wt%, respectively.
  • Mass transfer tests were conducted with two different size nozzles at nozzle velocities ranging from 5 ft/s to 22 ft/s using the slurry of diluted centrate and undissolved mash solids as the aqueous phase. Three tests were done using a nozzle that has an ID of 0.76 mm, and three tests were done using a nozzle that has an ID of 2.03 mm. All tests were conducted at 30°C in the 6 inch diameter column described above using OA as the solvent. The results of the mass transfer tests using the slurry of diluted centrate and undissolved mash solids are shown in Table 2.
  • Nozzle I.D., mm 0.76 0.76 0.76 2.03 2.03 2.03
  • Figure 7 illustrates the effect of the presence of undissolved corn mash solids on the overall volumetric mass transfer coefficient, k L a, for the transfer of z ' -BuOH from an aqueous solution of liquefied corn starch (i.e., oligosaccharides) to a dispersion of oleyl alcohol droplets flowing up through a bubble column.
  • the OA was fed to the column through a 2.03 mm ID nozzle. It was discovered that the ratio of the k ⁇ a for a system where the solids have been removed to the for a system where the solids have not been removed is 2 to 5 depending on the nozzle velocity for a 2.03 mm nozzle.
  • Figure 8 illustrates the effect of the presence of undissolved corn mash solids on the overall volumetric mass transfer coefficient, k ⁇ a, for the transfer of z ' -BuOH from an aqueous solution of liquefied corn starch (i.e., oligosaccharides) to a dispersion of oleyl alcohol droplets flowing up through a bubble column.
  • the OA was fed to the column through a 0.76 mm ID nozzle. It was discovered that the ratio of the k L a for a system where the solids have been removed to the for a system where the solids have not been removed is 2 to 4 depending on the nozzle velocity for a 0.76 mm nozzle.
  • This example illustrates improved phase separation between an aqueous solution of oligosaccharides derived from liquefied corn mash from which undissolved solids have been removed and a solvent phase as compared to an aqueous solution of oligosaccharides derived from liquefied corn mash from which no undissolved solids have been removed and the same solvent.
  • Both systems contained z ' -BuOH.
  • Adequate separation of the solvent phase from the aqueous phase is important for liquid-liquid extraction to be a viable separation method for practicing in- situ product removal (ISPR).
  • Approximately 900 g of liquefied corn mash was prepared in a 1 L glass, jacketed resin kettle. The kettle was set up with mechanical agitation, temperature control, and pH control. The following protocol was used: mixed ground corn with tap water (26 wt% corn on a dry basis), heated the slurry to 55°C while agitating, adjusted pH to 5.8 with either NaOH or H 2 S0 4 , added alpha-amylase (0.02 wt% on a dry corn basis), continued heating to 85°C, adjusted pH to 5.8, held at 85°C for 2 hrs while maintaining pH at 5.8, cool to 25°C.
  • the corn used was whole kernel yellow corn from Pioneer (3335).
  • the alpha-amylase enzyme was Liquozyme® SC DS from Novozymes (Franklinton, NC). The total amounts of the ingredients used were: 265.9 g of ground corn (12% moisture), 634.3 g of tap water, and 0.056 g of Liquozyme® SC DS. The total amount of liquefied corn mash recovered was 883.5 g.
  • Part of the liquefied corn mash was used directly, without removing undissolved solids, to prepare the aqueous phase for phase separation tests involving solids.
  • Part of the liquefied corn mash was centrifuged to remove most of the undissolved solids and used to prepare the aqueous phase for phase separation tests involving the absence of solids.
  • the objective of the phase separation test was to measure the effect of undissolved solids on the degree of phase separation between a solvent phase and an aqueous phase that simulates a broth that is derived from liquefied corn mash.
  • the aqueous liquid phase contained about 20 wt% oligosaccharides, and the organic phase contained oleyl alcohol (OA) in all tests.
  • OA oleyl alcohol
  • z ' -BuOH was added to all tests to give approximately 25 g/L in the aqueous phase when the phases were at equilibrium. Two shake tests were performed.
  • the aqueous phase for the first test (with solids) was prepared by mixing 60.0 g of liquefied corn mash with 3.5 g of z ' -BuOH.
  • the aqueous phase for the second test (solids removed) was prepared by mixing 60.0 g of centrate which was obtained from the liquefied corn mash by removing the solids, with 3.5 g of z ' -BuOH. 15.0 g of oleyl alcohol (80/85% grade from Cognis) was added to each of the shake test bottles. The OA formed a separate liquid phase on top of the aqueous phase in both bottles resulting in a mass ratio of phases: Aq Phase/Solvent Phase to be about 1/4. Both bottles were shaken vigorously for 2 minutes to intimately contact the aqueous and organic phases and enable the z ' -BuOH to approach equilibrium between the two phases. The bottles were allowed to set for 1 hour.
  • Photographs were taken at various times (0, 15, 30, and 60 minutes) to observe the effect of undissolved solids on phase separation in systems that contain an aqueous phase derived from liquefied corn mash, a solvent phase containing OA, and i- BuOH. Time zero (0) corresponds to the time immediately after the two minute shake period was complete.
  • phase water is water that exists as a separate aqueous phase. Additional amounts of aqueous phase will increase the loading and energy requirement in the distillation column.
  • This example shows that removing most of the undissolved solids from liquefied corn mash results in improved phase separation after the liquid, aqueous phase obtained from the mash is contacted with a solvent, such as oleyl alcohol.
  • a solvent such as oleyl alcohol.
  • the upper phase obtained after phase separation will contain significantly less undissolved solids if the solids are removed first before contacting the liquid part of mash with an organic solvent. This demonstrates advantages of minimizing the undissolved solids content of mash in the upper ("organic") layer of the phase separation for an extractive fermentation.
  • this example illustrates improved phase separation between an aqueous solution of oligosaccharides derived from liquefied corn mash from which undissolved solids have been removed, and a solvent phase as compared to an aqueous solution of oligosaccharides derived from liquefied corn mash from which no undissolved solids have been removed and the same solvent.
  • Both systems contained z ' -BuOH. Adequate separation of the solvent phase from the aqueous phase is important for liquid- liquid extraction to be a viable separation method for practicing in-situ product removal (ISPR).
  • ISPR in-situ product removal
  • Example 6 The same mixtures prepared for Example 6 were used in this example. The only difference was that the samples were allowed to sit for several days after completion of sample preparation as described in Example 6 before repeating the phase separation shake test described in this example.
  • the sample labeled "with solids” consisted of liquefied corn mash, z ' -BuOH, and oleyl alcohol.
  • the sample labeled "solids removed” consisted of centrate which was produced by removing most of the undissolved solids from liquefied corn mash, z ' -BuOH, and oleyl alcohol.
  • the liquefied mash contained approximately 7 wt% suspended solids, and the centrate produced from the mash contained approximately 0.5 wt% suspended solids.
  • the liquid phase in the liquefied mash and the centrate produced from the mash would have contained approximately 20 wt% dissolved oligosaccharides (liquefied starch) on a solids-free basis.
  • Both samples contained oleyl alcohol in an amount to give a mass ratio of phases: Solvent Phase/Aq Phase to be about 1/4.
  • z ' -BuOH was added to all tests to give approximately 25 g/L in the aqueous phase when the phases were at equilibrium.
  • the objective of the phase separation test was to measure the effect of undissolved solids on the degree of phase separation between a solvent phase (containing OA) and an aqueous phase derived from liquefied corn mash (with and without solids) after the multiphase mixtures aged at room temperature for several days to mimic the potential change in properties of the system through out an extractive fermentation.
  • Two shake tests were performed. Both bottles were shaken vigorously for 2 minutes to intimately contact the aqueous and organic phases. The bottles were allowed to sit for 1 hour. Photographs were taken at various times (0, 2, 5, 10, 20, and 60 minutes) to observe the effect of undissolved solids on phase separation in these systems which had aged for several days. Time zero (0) corresponds to the time immediately after the bottles were placed on the bench.
  • Phase separation started to occur in the sample where solids were removed after two minutes. It appeared that almost complete phase separation had occurred in the sample where solids had been removed after only 5-10 minutes based on the fact that the organic phase occupied approximately 25% of the total volume of the two phase mixture. It would be expected that complete separation would be indicated if the organic phase occupied approximately 20% of the total volume, since that corresponds to the initial ratio of phases. No apparent phase separation occurred in the sample where solids were not removed even after one hour.
  • composition of the upper phase for both samples was also compared.
  • the composition of the upper phase has implications for the process downstream of the extractive fermentation wherein the next step is a distillation. It is advantageous to minimize the amount of microorganisms in the top of the organic phase because the microorganisms will be thermally deactivated in the distillation column.
  • Another component to minimize in the top of the organic phase is the amount of undissolved solids because the solids could plug the distillation column, foul the reboiler, cause poor phase separation in the solvent/water decanter located at the base of the column, or any combination of the previously mentioned concerns.
  • another component to minimize in the top of the organic phase is the amount of phase water which is water that exists as a separate aqueous phase, because this additional amount of aqueous phase will increase the loading and energy requirement in the subsequent distillation column.
  • the amount of undissolved solids in the sample pulled from the top of the "With Solids” shake test bottle is approximately the same as what is found in liquefied corn mash, which shows that essentially no solids settled in this shake test bottle within 60 minutes.
  • the top layer from the phase separation test involving centrate (“Solids Removed") from which solids were removed, contained essentially no undissolved solids.
  • the results also show that the top layer from the phase separation test involving centrate contained less phase water. This is indicated by the fact that the ratio of the solvent phase to aqueous phase in that sample bottle is approximately 1/1 w/w, which shows that the organic phase was enriched with solvent (OA) in the test where solids were removed.
  • Table 4 shows an estimate of the relative amount of phases that were dispersed throughout the upper "organic” layers in both shake test bottles after 60 minutes of settling time.
  • This example shows that removing undissolved solids from liquefied corn mash that contains z ' -BuOH, contacting it with a solvent phase, letting it set for several days, and mixing the phases again results in improved phase separation when compared to a sample where undissolved solids were not removed from the liquefied mash.
  • this example shows that essentially no phase separation occurs in the sample where undissolved solids were not removed even after 60 minutes.
  • This example shows that the upper phase obtained after phase separation contains significantly less undissolved solids if the solids are removed first before contacting the liquid part of mash with an organic solvent.
  • This example demonstrates the potential for reducing solvent losses via DDGS generated by the extractive fermentation process by removing undissolved solids from the corn mash prior to fermentation using a semi-continuous disk-stack centrifuge.
  • the corn used was whole kernel yellow corn from Pioneer (3335). It was ground in a hammer-mill using a 1 mm screen. The moisture content of the ground corn was measured to be 12 wt%, and the starch content of the ground corn was measured to be 71.4 wt% on a dry corn basis.
  • the alpha-amylase enzyme was Liquozyme® SC DS from Novozymes (Franklinton, NC).
  • the amounts of the ingredients used were: 61.8 kg of ground corn (12% moisture), 147.3 kg of tap water, a solution of 0.0109 kg of Liquozyme® SC DS in 1 kg of water for first alpha-amylase charge, another solution of 0.0109 kg of Liquozyme® SC DS in 1 kg of water for second alpha-amylase charge (after the cook stage). About 5 kg of H 2 0 was added to the batch via steam condensate during the cook stage. A total of 0.25 kg of NaOH (12.5 wt%) and 0.12 kg of H 2 S0 4 (12.5 wt%) were added throughout the run to control pH. The total amount of liquefied corn mash recovered was 216 kg.
  • the composition of the final liquefied corn mash slurry was estimated to be approximately 7 wt% undissolved solids and 93 wt% liquid.
  • the liquid phase contained about 19 wt% (190 g/L) liquefied starch (soluble oligosaccharides).
  • the rheology of the mash is important regarding the ability to separate the slurry into its components.
  • the liquid phase in the mash was determined to be a Newtonian fluid with a viscosity of about 5.5 cP at 30°C.
  • the mash slurry was determined to be a shear-thinning fluid with a bulk viscosity of about 10 to 70 cP at 85°C depending on shear rate.
  • Clarified centrate (36.1 g) and 12.4 g of pellet (wet cake) were recovered. It was determined that the clarified centrate contained about 0.3 wt% undissolved solids and that the pellet (wet cake) contained about 27 wt% undissolved solids. Based on this data, a discharge interval of 4 minutes was chosen for operation of the disk stack centrifuge.
  • the disk stack centrifuge was operated at 9000 rpm (6100 g's) with a liquefied corn mash feed rate of 1 L/min and about 60°C. Mash (209 kg) was separated into 155 kg of clarified centrate and 55 kg of wet cake.
  • the split defined as (amount of centrate)/(amount of mash fed), achieved by the semi-continuous disk stack was similar to the split achieved in the batch centrifuge.
  • a 45 mL sample of the clarified centrate recovered from the disk stack centrifuge was spun down in a lab centrifuge at 21,000 g's for 10 minutes to estimate the level of suspended solids in the centrate.
  • About 0.15-0.3 g of undissolved solids were recovered from the 45 mL of centrate. This corresponds to 0.3-0.7 wt%> undissolved solids in the centrate which is about a ten-fold reduction in undissolved solids from mash fed to the centrifuge.
  • This example demonstrates the potential for reducing solvent losses via DDGS generated by the extractive fermentation process by removing undissolved solids from the corn mash prior to fermentation using a centrifuge.
  • a lab-scale bottle spin test was performed using liquefied corn mash. The test simulates the operating conditions of a typical decanter centrifuge used to remove undissolved solids from whole stillage in a commercial ethanol (EtOH) plant. Decanter centrifuges in commercial EtOH plants typically operate at a relative centrifugal force (RCF) of about 3000 g's and a whole stillage residence time of about 30 seconds. These centrifuges typically remove about 90% of the suspended solids in whole stillage which contains about 5% to 6% suspended solids (after the beer column), resulting in thin stillage which contains about 0.5% suspended solids.
  • RCF relative centrifugal force
  • the sample was centrifuged at an RCF of about 3000 g's (4400 rpm rotor speed) for a total of 1 minute.
  • the sample spent about 30-40 seconds at 3000 g's and a total of 20-30 seconds at speeds less than 3000 g's due to speeding up and slowing down of the centrifuge.
  • the sample temperature was about 60°C.
  • Table 5 summarizes the suspended (undissolved) solids mass balance for the bottle spin test at conditions representative of the operation of a decanter centrifuge to convert whole stillage to thin stillage in a commercial EtOH process. All values given in Table 5 are approximate.
  • centrate contained about 190 g/L of dissolved oligosaccharides (liquefied starch). This is consistent with the assumption that most of the starch in the ground corn was liquefied (i.e., hydro lyzed to soluble oligosaccharides) in the liquefaction process based on the corn loading used (about 26 wt%> on a dry corn basis) and the starch content of the corn used to produce the liquefied mash (about 71.4 wt% starch on a dry corn basis). Hydrolyzing most of the starch in the ground corn at a 26%o dry corn loading will result in about 7 wt%> suspended (undissolved) solids in the liquefied corn mash charged to the centrifuge used for the bottle spin test.
  • This example demonstrates the potential to remove and recover corn oil from com mash by removing the undissolved solids prior to fermentation.
  • the effectiveness of the extraction solvent may be improved if corn oil is removed via removal of the undissolved solids.
  • removal of com oil via removal of the undissolved solids may also minimize any reduction in solvent partition coefficient and potentially resulting an improved extractive fermentation process.
  • the alpha-amylase enzyme was Liquozyme® SC DS from Novozymes (Franklinton, NC). The total amounts of the ingredients used were: 294.5 g of ground corn (11.7% moisture), 705.5 g of tap water, and 0.059 g of Liquozyme® SC DS. Water (4.3 g) was added to dilute the enzyme, and a total of 2.3 g of 20% NaOH solution was added to control pH. About 952 g of mash was recovered.
  • the aqueous solution of oligosaccharides was decanted away from the wet cake.
  • About 617 g of liquefied starch solution was recovered leaving about 334 g of wet cake.
  • the wet cake contained most of the undissolved solids that were in the liquefied mash.
  • the liquefied starch solution contained about 0.2 wt% undissolved solids.
  • the wet cake contained about 21 wt% undissolved solids.
  • the wet cake was washed with 1000 g of tap water to remove the oligosaccharides still in the cake. This was done by mixing the cake with the water to form a slurry.
  • the slurry was then centrifuged under the same conditions used to centrifuge the original mash in order to recover the washed solids. Removing the washed solids by centrifuging the wash slurry also resulted in the removal of some additional free corn oil that must have remained with the original wet cake produced from the liquefied mash. This additional corn oil was observed as a separate, thin, organic liquid layer on top of the aqueous phase of the centrifuged wash mixture. Approximately 1 g of additional corn oil was recovered from the wash process.
  • This example describes extractive fermentations performed using corn mash and corn mash centrate as the sugar source.
  • Corn mash centrate was produced by removing undissolved solids from the corn mash prior to fermentation.
  • Four extractive fermentations were conducted side-by side, two with liquefied corn mash as the sugar source (solids not removed) and two with liquefied mash centrate (aqueous solution of oligosaccharides) obtained by removing most of the undissolved solids from liquefied corn mash.
  • Oleyl alcohol (OA) was added to two of the fermentations, one with solids and one with solids removed, to extract the product (z ' -BuOH) from the broth as it was formed.
  • a mixture of corn oil fatty acids (COFA) was added to the other two of the fermentations, one with solids and one with solids removed, to extract the product from the broth as it was formed.
  • the COFA was made by hydrolyzing corn oil. The purpose of these fermentations was to test the effect of removing solids on phase separation between the solvent and broth (see Example 11) and to measure the amount of residual solvent trapped in the undissolved solids recovered from fermentation broths where solids were or were not removed (see Example 12).
  • the corn used was whole kernel yellow corn from Pioneer. It was ground in a pilot-scale hammer-mill using a 1 mm screen. The moisture content of the ground corn was measured to be about 12 wt%, and the starch content of the ground corn was measured to be about 71.4 wt% on a dry corn basis.
  • the alpha-amylase enzyme used was Spezyme® Fred-L (Genencor®, Palo Alto, CA). The amounts of the ingredients used were: 14.1 kg of ground corn (12% moisture), 16.9 kg of tap water, a solution of alpha- amylase consisting of 19.5 g of Spezyme® Fred-L in 2.0 kg of water. The alpha-amylase was sterile filtered. A total of 0.21 kg of NaOH (17 wt%) was added throughout the run to control pH.
  • the mash was prepared with a higher concentration of oligosaccharides than was desired in the fermentations to allow for dilution when adding the nutrients, inoculum, glucoamylase, and base to the initial fermentation broth. After dilution by addition of nutrients, inoculum, glucoamylase, and base, the expected total initial soluble sugars in the mash (solids not removed) was about 250 g/L.
  • a Saccharomyces cerevisiae strain that was engineered to produce isobutanol from a carbohydrate source, with pdcl deleted, pdc5 deleted, and pdc6 deleted was grown to 0.55-1.1 g/L dew (OD 6 oo 1.3-2.6 - Thermo Helios a Thermo Fisher Scientific Inc., Waltham, Massachusetts) in seed flasks from a frozen culture.
  • the culture was grown at 26°C in an incubator rotating at 300 rpm.
  • the frozen culture was previously stored at - 80°C.
  • the composition of the first seed flask medium was:
  • a glass jacked, 2 L fermentor (Sartorius AG, Goettingen, Germany) was charged with liquefied mash either with or without solids (centrate).
  • the probe was then placed into the fermentor, through the stainless steel head plate.
  • a dissolved oxygen probe (p0 2 probe) was also placed into the fermentor through the head plate. Tubing used for delivering nutrients, seed culture, extracting solvent, and base were attached to the head plate and the ends were foiled.
  • the entire fermentor was placed into a Steris (Steris Corporation, Mentor, Ohio) autoclave and sterilized in a liquid cycle for 30 minutes.
  • the fermentor was removed from the autoclave and placed on a load cell.
  • the jacket water supply and return line was connected to the house water and clean drain, respectively.
  • the condenser cooling water in and water out lines were connected to a 6-L recirculating temperature bath running at 7°C.
  • the vent line that transfers the gas from the fermentor was connected to a transfer line that was connected to a Thermo mass spectrometer (Prima dB, Thermo Fisher Scientific Inc., Waltham, Massachusetts).
  • the sparger line was connected to the gas supply line.
  • the tubing for adding nutrients, extract solvent, seed culture, and base was plumbed through pumps or clamped closed.
  • the autoclaved material, 0.9% w/v NaCl was drained prior to the addition of liquefied mash.
  • the fermentor temperature was set to 55°C instead of 30°C after the liquefaction cycle was complete ⁇ Liquefaction).
  • a lipase enzyme stock solution was added to the fermentor to a final lipase concentration of 10 ppm.
  • the fermentor was held at 55°C, 300 rpm, and 0.3 slpm N 2 overlay for >6 hrs. After the Lipase Treatment was complete the fermentor temperature was set to 30°C.
  • the fermentors p0 2 probe was calibrated to zero while N 2 was being added to the fermentor.
  • the fermentors p0 2 probe was calibrated to its span with sterile air sparging at 300 rpm.
  • the fermentor was inoculated after the second seed flask was > 4 g/L dew.
  • the shake flask was removed from the incubator/shaker for 5 minutes allowing a phase separation of the oleyl alcohol phase and the aqueous phase.
  • the 55 mL of the aqueous phase was transferred to a sterile, inoculation bottle.
  • the inoculum was pumped into the fermentor through a peristaltic pump.
  • the fermentor was operated at 30°C for the entire growth and production stages.
  • the pH was allowed to drop from a pH between 5.7-5.9 to a control set-point of 5.2 without adding any acid.
  • Sterile air was added to the fermentor, through the sparger, at 0.3 slpm for the remainder of the growth and production stages.
  • the p0 2 was set to be controlled at 3.0% by the Sartorius DCU-3 Control Box PID control loop, using stir control only, with the stirrer minimum being set to 300 rpm and the maximum being set to 2000 rpm.
  • the glucose was supplied through simultaneous saccharification and fermentation of the liquified corn mash by adding a a- amylase (glucoamylase). The glucose was kept excess (1-50 g/L) for as long as starch was available for saccharification.
  • Thermo Prima dB has a calibration check run every Monday morning at 6:00am. The calibration check was scheduled through the Gas Works vl .O (Thermo Fisher Scientific Inc., Waltham, Massachusetts) software associated with the mass spec. The gas calibrated for were:
  • Carbon dioxide was checked at 5% and 15% during calibration cycle with other known bottled gases.
  • Oxygen was checked at 15% with other known bottled gases.
  • the amount of isobutanol stripped, oxygen consumed, and carbon dioxide respired into the off-gas was measured by using the mass spectrometer's mole fraction analysis and gas flow rates (mass flow controller) into the fermentor. Calculate the gassing rate per hour and then integrating that rate over the course of the fermentation.
  • hemacytometer 10 uL was drawn up of the final Trypan Blue dilution with an m20 Variable Channel BioHit pipette with 2-20 BioHit pipette tips and injected into the hemacytometer.
  • the hemacytometer was placed on the Zeis Axioskop 40 microscope at 40x magnification. The center quadrant is broken into 25 squares, the four corner and center squares in both chambers were then counted and recorded. After both chambers were counted the average was taken and multiplied by the dilution factor (20), then by 25 for the number for squares in the quadrant in the hemacytometer and then divided by 0.0001 mL, which is the volume of the quadrant that was counted. The sum of this calculation is the number cells per mL.
  • Samples were refrigerated until ready for processing. Samples were removed from refrigeration for one hour to bring to room temperature. Approximately 300 uL of sample was transferred with a ml 000 Variable Channel BioHit pipette with 100-1000 BioHit pipette tips into a 0.2 um centrifuge filter (Nanosep MF modified nylon centrifuge filter), then centrifuged using a Eppendorf 5415C for five minutes at 14,000 rpm. Approximately 200 uL of filtered sample was transferred into a 1.8 auto sampler vial with a 250 uL glass vial insert with polymer feet. A screw cap with PTFE septa, was used to cap the vial before vortexing the sample with a Vortex-Genie® set at 2700 rpm.
  • Samples were refrigerated until ready for processing. Samples were removed from refrigerator for one hour to bring to room temperature. Approximately 150 uL of sample was transferred using a ml 000 Variable Channel BioHit pipette with 100-1000 BioHit pipette tips into a 1.8 auto sampler vial with a 250 uL glass vial insert with polymer feet. A screw cap with PTFE septa was used to cap the vial.
  • the column was a HP-DB-FFAP column (15 meters x 0.53 mm ID (Megabore), 1-micron film thickness column (30 m x 0.32 mm ID, 0.25 ⁇ film).
  • the carrier gas was helium at a flow rate of 3.7 mL/min measured at 45°C with constant head pressure; injector split was 1 :50 at 225°C; oven temperature was 100°C for 2.0 min, 100°C to 250°C at 10°C/min, then 250°C for 9 min for a run time of 26 minutes. Flame ionization detection was used at 300°C with 40 mL/min helium makeup gas.
  • Fermentor Preparation method with corn mash that excludes solids Lipase Treatment Post-Liquefaction, Nutrient Addition Prior to Inoculation method, Fermentor Inoculation method, Fermentor Operating Conditions method, and all of the Analytical methods.
  • Corn oil fatty acid was added in a single batch between 0.1- 1.0 hr after inoculation.
  • the butanologen was CEN.PK113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm Apdc5::sadB Agpd2::loxP / pYZ090 + pLH468 ( GCI-070).
  • Fermentor Preparation method with corn mash that includes solids, Lipase Treatment Post-Liquefaction, Nutrient Addition Prior to Inoculation method, Fermentor Inoculation method, Fermentor Operating Conditions method, and all of the Analytical methods.
  • Corn oil fatty acid was added in a single batch between 0.1- 1.0 hr after inoculation.
  • the butanologen was CEN.PK113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm Apdc5::sadB Agpd2::loxP / pYZ090 + pLH468 ( GCI-070).
  • Experiment identifier 2010Y035 included: Seed Flask Growth method, Initial
  • Fermentor Preparation method with corn mash that excludes solids Nutrient Addition Prior to Inoculation method, Fermentor Inoculation method, Fermentor Operating Conditions method, and all of the Analytical methods.
  • Oleyl alcohol was added in a single batch between 0.1- 1.0 hr after inoculation.
  • the butanologen was CEN.PK113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm Apdc5::sadB Agpd2::loxP / pYZ090 + pLH468 (NGCI-070).
  • Experiment identifier 2010Y036 included: Seed Flask Growth method, Initial
  • Fermentor Preparation method with corn mash that includes solids Nutrient Addition Prior to Inoculation method, Fermentor Inoculation method, Fermentor Operating Conditions method, and all of the Analytical methods.
  • Oleyl alcohol was added in a single batch between 0.1- 1.0 hr after inoculation.
  • the butanologen was CEN.PK113-7D Aura3::loxP Ahis3 Apdc6 Apdcl ::ilvDSm Apdc5::sadB Agpd2::loxP / pYZ090 + pLH468 (NGCI-070).
  • This example demonstrates the effect of removing undissolved solids from the mash prior to fermentation on fermentor volume efficiency.
  • Undissolved solids in corn mash occupy at least 5% of the mash volume depending on corn loading and content starch content. Removing solids before fermentation enables at least 5% more sugar to be charged to the fermentor thus increasing batch productivity.
  • the liquefied corn mash produced in Example 10 contained approximately 28 wt% (280 g/L) liquefied starch based on the corn loading used (40% dry corn basis), starch content of the corn (71.4% dry corn basis), and assuming all the starch was hydrolyzed to soluble oligosaccharides during liquefaction.
  • the mash was prepared with a higher concentration of oligosaccharides than was desired in the fermentations as described in Example 11 to allow for dilution when adding the nutrients, inoculum, glucoamylase, and base to the initial fermentation broth. The mash was diluted by approximately 10% after adding these ingredients.
  • the expected concentration of liquefied starch in the mash (including solids) at the beginning of fermentations 2010Y034 and 2010Y036 was about 250 g/L.
  • the actual glucose equivalents charged to the 2010Y034 and 2010Y036 fermentations was measured to be 239 g/kg and 241 g/kg, respectively (see Table 8).
  • the glucose equivalents charged to the 2010Y033 and 2010Y035 fermentations was measured to be 257 g/kg and 263 g/kg, respectively. Note that the feed to these fermentations was centrate (mash from which most of the solids had been removed). Approximately 1.2 L of the sugar source (mash or centrate) was charged to each fermentation.
  • the fermentation broth referred to in this example where solids were not removed from the feed (used corn mash) was 2010Y036 as described in Example 10.
  • the fermentation broth referred to in this example where solids were removed from the feed (used centrate produced from corn mash) was 2010Y035 as described in Example 10.
  • Oleyl alcohol was the extraction solvent used in both fermentations. The rate and degree of phase separation was measured and compared throughout the fermentations as well as for the final fermentation broths. Adequate phase separation in an extractive fermentation process can lead to minimal loss of the microorganism and minimal solvent losses as well lower capital and operating cost of downstream processing. Phase Separation Between Solvent and Broth Phases During Fermentation
  • Phase separation started to occur within about 10- 15 minutes of pulling the samples from the run where solids were removed for all fermentation times and continued to improve over a 2 hr period of time. Phase separation started to occur in the sample pulled at 5.3 hrs fermentation run time from the centrate fermentation (solids removed) after about 7 minutes of settling time. Phase separation started to occur in the sample pulled at 53.3 hrs from the centrate fermentation (solids removed) after about 17 minutes of settling time.
  • FIG. 9 is a plot of the position of the liquid-liquid interface in the fermentation sample tubes as a function of (gravity) settling time.
  • the data is for the samples pulled from the extractive fermentation where centrate was fed (solids removed from corn mash) as the sugar source and OA was the ISPR extraction solvent (run 2010Y035 in Example 10).
  • the phase separation data in this plot is for samples pulled at 5.3, 29.3, 53.3, and 70.3 hrs run time from fermentation 2010Y035.
  • the interface position is reported as a percentage of the total broth height in the sample tube.
  • the interface position in the sample pulled at 5.3 hrs run time from the 2010Y035 fermentation increased from the bottom of the sample tube (no separation) to 3.5 mL after 120 minutes of settling time. There was about 10 mL of total broth in that particular sample tube. Therefore, the interface position for that sample was reported as 35% in FIG. 9.
  • the interface position in the sample pulled at 53.3 hrs run time from the 2010Y035 fermentation increased from the bottom of the sample tube (no separation) to about 3.9 mL after 125 minutes of settling time. There was about 10 mL of total broth in that particular sample tube. Therefore, the interface position for that sample was reported as 39% in FIG. 9.
  • FIG. 10 is a plot of the liquid-liquid interface position as a function of (gravity) settling time for the final two phase broth from the extractive fermentation where solids were removed (2010Y035).
  • the interface position is reported as a percentage of the total broth height in the 2 L graduated cylinder used to observe phase separation of the final broth.
  • the interface position of the final broth from the 2010Y035 fermentation increased from the bottom of the graduated cylinder (no separation) to a level that was about 40% of the total height of the two phase mixture after 175 min of settling time. Therefore, almost complete separation of the two phases in the final broth occurred after 3 hrs of settling time. An interface position of approximately 50% would correspond to complete separation.
  • a 10 mL sample was also pulled from the bottom phase of the final broth (which had settled for about 3 hrs) from the fermentation where solids had been removed.
  • the sample was spun in a high-speed lab centrifuge to determine the amount of organic phase that was present in the aqueous phase after allowing the broth to settle for 3 hrs. It was determined that essentially no organic phase was present in the bottom (aqueous) phase of the final broth from the fermentation from which solids had been removed after the broth had settled for 3 hrs.
  • a 10 mL sample was pulled from the top of the final broth from the fermentation from which solids had not been removed after the broth had set for about 3 hrs.
  • the sample was spun in a high-speed lab centrifuge to determine the relative amount of solvent and aqueous phases at the top of the final broth.
  • This broth contained all solids from the liquefied corn mash solids.
  • About half of the sample was aqueous phase, and about half was organic phase.
  • the aqueous phase contained significantly more undissolved solids (from the liquefied mash) compared to the sample of the top layer from the broth where solids were removed.
  • Example 10 described two extractive fermentations conducted side-by side, one with liquefied corn mash as the sugar source (2010Y036 - solids not removed) and one with liquefied mash centrate (2010Y035 - aqueous solution of oligosaccharides) obtained by removing most of the undissolved solids from liquefied corn mash.
  • Oleyl alcohol (OA) was added to both fermentations to extract the product isobutanol (z ' -BuOH) from the broth as it was formed. The amount of residual solvent trapped in the undissolved solids recovered from the final fermentation broths was measured and compared.
  • Example 10 the broths were harvested and used to conduct the phase separation tests described in Example 11. Then the undissolved solids (fines from the corn mash that did not get removed prior to fermentation) were recovered from each broth and analyzed for total extractable oils. The oil recovered from each lot of solids was analyzed for OA and corn oil. The following protocol was followed for both broths:
  • the broth was centrifuged to separate the organic, aqueous, and solid phases.
  • the organic and aqueous phases were decanted away from the solids leaving a wet cake at the bottom of the centrifuge bottle.
  • the wet cake was thoroughly washed with water to remove essentially all of the dissolved solids held up in the cake, such as residual oligosaccharides, glucose, salts, enzymes, etc.
  • the washed wet cake was dried in a vacuum oven overnight (house-vacuum at 80°C) to remove essentially all of the water in the cake.
  • the oil recovered from the solids was analyzed by GC to determine the relative amount of OA and corn oil present in the oil recovered from the solids.
  • PSD particle size distribution
  • a portion of the wet cake was mixed with hot water to form a slurry (S-l).
  • the slurry was pumped back through the decanter centrifuge to produce a wash water centrate (C-2) and a washed wet cake (WC-2).
  • C-2 was a relatively solids-free, dilute aqueous solution of soluble starch.
  • the concentration of soluble starch in C-2 was less than the concentration of soluble starch in the centrate produced from the separation of mash.
  • the liquid phase held up in WC-2 was more dilute in starch than the liquid in the wet cake produced from the separation of mash.
  • the washed wet cake (WC- 2) was mixed with hot water to form a slurry (S-2).
  • the ratio of water charged to the amount of soluble starch in the wet cake charged was the same in both wash steps.
  • the second wash slurry was pumped back through the decanter centrifuge to produce a second wash water centrate (C-3) and a wet cake (WC-3) that had been washed twice.
  • C-3 was a relatively solids-free, dilute aqueous solution of soluble starch.
  • the concentration of soluble starch in C-3 was less than the concentration of soluble starch in the centrate produced in the first wash stage (C-2), and thus the liquid phase held up in WC-3 (second washed wet cake) was more dilute in starch than in WC-2 (first washed wet cake).
  • the total soluble starch in the two wash centrates (C-2 and C-3) is the starch that was recovered and could be recycled back to liquefaction.
  • the soluble starch in the liquid held up in the final washed wet cake is much less that in the wet cake produced in the original separation of the mash.
  • the production rate of liquefied corn mash was about 3 gpm.
  • the starch content of the ground corn was measured to be about 70 wt% on a dry corn basis.
  • the total solids (TS) of the liquefied mash was about 31 wt%, and the total suspended solids (TSS) was approximately 7 wt%.
  • the liquid phase contained about 23-24 wt% liquefied starch as measured by HPLC (soluble oligosaccharides).
  • Feed Rate Varied from 5-20 gpm.
  • DP3 refers to a dextrose polymer containing three glucose units (glucose trimer).
  • DP4+ refers to a dextrose polymer containing four or more glucose units (glucose tetramer and higher).
  • the washed wet cake contained approximately 2.6% of the soluble starch that was present in the original liquefied mash if all 600 lbm of the cake produced by the centrifuge could have been washed. This represents about a 78% reduction in soluble starch in the washed wet cake compared to the mash wet cake prior to washing. If the wet cake produced from the separation of liquefied mash was not washed, about 12% of the total starch in the mash would be lost as soluble (liquefied) starch. If the wet cake produced from the separation of mash is washed with water at the conditions demonstrated in this example, 2.6% of the total starch from the mash would be lost as soluble (liquefied) starch.
  • the concentration of soluble starch in the liquid phase held up in the washed wet cake must have been about 1.6 wt% (by mass balance) for this dilution wash. Based on the total solids and dissolved oligosaccharide data, it was estimated that the total suspended solids in the washed wet cake was about 36 wt%. It was estimated that the washed wet cake contained approximately 0.5% of the soluble starch that was present in the original liquefied mash if all 600 lbm of the cake produced in the first wash stage could have been washed. This represents an overall reduction in soluble starch in the doubly washed wet cake compared to the mash wet cake prior to washing of about 96%.
  • the "cook" stage at some time in the middle of the reaction can result in higher conversion of the starch in corn solids to soluble (liquefied) starch.
  • the "cook” stage demonstrated in this example involves raising the liquefaction temperature at some point after liquefaction starts, holding at the higher temperature for some period of time, and then lowering the temperature back to the original value to complete liquefaction.
  • Example 1 (no intermediate high temperature stage). Liquefied corn mash was prepared in another run at the same conditions as in the first run except for the addition of an intermediate high temperature stage. The mash from both runs was worked up according to the following steps. It was centrifuged to separate the aqueous solution of liquefied starch from the undissolved solids. The aqueous solution of liquefied starch was decanted off to recover the wet cake. The wet cake contained most of the undissolved solids from the mash, but the solids were still wet with liquefied starch solution. The wet cake was thoroughly washed with water, and the subsequent slurry was centrifuged to separate the aqueous layer from the undissolved solids.
  • the cake was washed a total of five times with enough water to remove approximately all of the soluble starch that was held up in the original wet cake recovered from liquefaction. Consequently, the liquid phase held up in the final washed wet cake consisted of water containing essentially no soluble starch. [0365]
  • the final washed wet cake was reslurried in water, and large excesses of both alpha-amylase and glucoamylase were added. The slurry was mixed for at least 24 hrs while controlling temperature and pH to enable the alpha-amylase to convert essentially all the unhydrolyzed starch remaining in the undissolved solids to soluble oligosaccharides.
  • the soluble oligosaccharides generated from the residual starch (which was not hydrolyzed during liquefaction at the conditions of interest) were subsequently converted to glucose by the glucoamylase present.
  • Glucose concentration was tracked with time by HPLC to make sure all the oligosaccharides generated from the residual starch were converted to glucose and that the glucose concentration was no longer increasing with time.
  • the alpha-amylase was diluted in tap water (0.418 g enzyme in 20.802 g water)
  • the alpha-amylase was diluted in tap water (0.3366 g enzyme in 16.642 g water)
  • the washes were performed in the same bottle used to centrifuge the original mash to avoid transferring the cake between containers.
  • the cake was mixed with water, and the resulting wash slurry was centrifuged (5000 rpm for 20 minutes) at room temperature. This was done for all five wash stages performed on the wet cakes recovered from both batches of mash.
  • Approximately 165 g of water was used in each of the five washes of the wet cake from Batch 1 resulting in a total of 828.7 g of water used to wash the wet cake from Batch 1.
  • Approximately 500 g of water was used in each of the five washes of the wet cake from Batch 2 resulting in a total of 2500 g of water used to wash the wet cake from Batch 2.
  • the total wash centrate recovered from all five water washes of the wet cake from Batch 1 was 893.1 g.
  • the total wash centrate recovered from all five water washes of the wet cake from Batch 2 was 2566.3 g.
  • the final washed wet cake recovered from Batch 1 was 101.5 g, and the final washed wet cake recovered from Batch 2 was 151.0 g.
  • the final washed wet cakes obtained from each batch contained essentially no soluble starch; therefore, the liquid held up in each cake was primarily water.
  • the total solids (TS) of the wet cakes was measured using a moisture balance.
  • the total solids of the wet cake from Batch 1 was 21.63 wt%, and the TS for the wet cake from Batch 2 was 23.66 wt%.
  • Unhydrolyzed Starch Remaining in the Undissolved Solids after Liquefaction The level of unhydrolyzed starch remaining in the solids present in both washed wet cakes was measured by reslurrying the cakes in water and adding excess alpha- amylase and excess glucoamylase.
  • the alpha-amylase converts residual unhydrolyzed starch in the solids to soluble oligosaccharides which dissolve in the aqueous phase of the slurry.
  • the glucoamylase subsequently converts the soluble oligosaccharides generated by the alpha-amylase to glucose.
  • the reactions were run at 55°C (maximum recommended temperature for the glucoamylase) for at least 24 hrs to ensure all of the residual starch in the solids was converted to soluble oligosaccharides and that all the soluble oligosaccharides were converted to glucose.
  • the residual unhydrolyzed starch that was in the solids which is the starch that did not get hydrolyzed during liquefaction, can be calculated from the amount of glucose generated by this procedure.
  • the alpha-amylase and glucoamylase enzymes used in the following protocols were Liquozyme® SC DS and Spirizyme® Fuel, respectively (Novozymes, Franklinton, NC).
  • the vessel used to treat the washed wet cakes was a 250 mL jacketed glass resin kettle equipped with mechanical agitation, temperature control, and pH control.
  • the amount of Liquozyme® used corresponds to an enzyme loading of 0.08 wt% on a "dry corn basis.”
  • the amount of Spirizyme® used corresponds to an enzyme loading of 0.2 wt% on a "dry corn basis.” This basis is defined as the amount of ground corn required to give the amount of undissolved solids held up in the washed cakes assuming all the starch is hydrolyzed to soluble oligosaccharides.
  • the undissolved solids held up in the washed cakes are considered to be mostly the non-starch, non-fermentable part of the corn.
  • These enzyme loadings are at least four times higher than is required to give complete liquefaction and saccharification at 26% corn loading.
  • the enzymes were used in large excess to ensure complete hydrolysis of the residual starch in the solids and complete conversion of the oligosaccharides to glucose.
  • the alpha-amylase was diluted in tap water (0.1297 g enzyme in 10.3607 g water)
  • the glucoamylase was diluted in tap water (0.3212 g enzyme in 15.6054 g water)
  • the alpha-amylase was diluted in tap water (0.2384 g enzyme in 11.709 g water)
  • the glucoamylase was diluted in tap water (0.3509 g enzyme in 17.5538 g water)
  • FIG. 11 shows the concentration of glucose in the aqueous phase of the slurries as a function of time.
  • the maximum level of glucose reached by reacting (in the presence of alpha-amylase and glucoamylase) the washed wet cake obtained from the Batch 1 liquefaction was 4.48 g/L.
  • the maximum level of glucose reached by reacting (in the presence of alpha-amylase and glucoamylase) the washed wet cake obtained from the Batch 2 liquefaction was 2.39 g/L.
  • the total amount of enzyme used in both runs corresponded to 0.04 wt% (dry corn basis).
  • the pH was controlled at 5.8 during both liquefaction runs.
  • the liquefaction for Batch 3 was carried out in a 1L glass, jacketed resin kettle, and the liquefaction for Batch 4 was carried out in a 200L stainless steel fermentor. Both reactors were outfitted with mechanical agitation, temperature control, and pH control.
  • the washes were performed in the same bottle used to centrifuge the original mash to avoid transferring the cake between containers.
  • the cake was mixed with water, and the resulting wash slurry was centrifuged (5000 rpm for 15 min) at room temperature. This was done for all five wash stages performed on the wet cakes recovered from both batches of mash.
  • Approximately 164 g of water was used in each of the five washes of the wet cake from Batch 3 resulting in a total of 819.8 g of water used to wash the wet cake from Batch 3.
  • Approximately 400 g of water was used in each of the five washes of the wet cake from Batch 4 resulting in a total of 2000 g of water used to wash the wet cake from Batch 4.
  • the total wash centrate recovered from all five water washes of the wet cake from Batch 3 was 879.5 g.
  • the total wash centrate recovered from all five water washes of the wet cake from Batch 4 was 2048.8 g.
  • the final washed wet cake recovered from Batch 3 was 103.2 g, and the final washed wet cake recovered from Batch 4 was 114.6 g.
  • the final washed wet cakes obtained from each batch contained essentially no soluble starch; therefore, the liquid held up in each cake was primarily water.
  • the total solids (TS) of the wet cakes was measured using a moisture balance.
  • the total solids of the wet cake from Batch 3 was 21.88 wt%, and the TS for the wet cake from Batch 4 was 18.1 wt%.
  • the glucose concentration continued to increase slightly between 24 hrs and 47 hrs. It is assumed that the glucose concentration measured at 47 hrs for the Batch 4 wet cake is approximately equal to the maximum value.
  • the maximum level of glucose reached by reacting (in the presence of alpha-amylase and glucoamylase) the washed wet cake obtained from the Batch 3 liquefaction was 8.33 g/L.
  • the maximum level of glucose reached by reacting (in the presence of alpha-amylase and glucoamylase) the washed wet cake obtained from the Batch 4 liquefaction was 4.92 g/L.
  • Liquefaction conditions can influence the conversion of starch in the corn solids to soluble (liquefied) starch.
  • Possible liquefaction conditions that could affect the conversion of starch in the ground corn to soluble starch are temperature, enzyme (alpha- amylase) loading, and +/- a high temperature (“cook”) stage occurs at some time during liquefaction. Examples 16 and 17 demonstrated that implementing a high temperature (“cook") stage at some time during liquefaction can result in higher conversion of starch in the corn solids to soluble (liquefied) starch.
  • the high temperature stage in the liquefactions described in Examples 16 and 17 involved raising the liquefaction temperature at some point after liquefaction starts, holding at the higher temperature for some period of time, and then lowering the temperature back to the original value to complete liquefaction.
  • Example 16 The liquefaction reactions compared in Example 16 were run at a different enzyme loading than the reactions compared in Example 17. These examples demonstrate the effect of two key liquefaction conditions on starch conversion: (1) enzyme loading, and (2) +/- a high temperature stage is applied at some time during liquefaction.
  • FIG. 13 illustrates the effect of enzyme loading and +/- a high temperature stage was applied at some time during the liquefaction on starch conversion.
  • the level of residual unhydrolyzed starch in the solids is the starch that was not hydrolyzed during the liquefaction conditions of interest.
  • FIG. 13 shows that the level of unhydrolyzed starch in the solids was reduced by almost half by applying a high temperature ("cook") stage at some point during the liquefaction. This was demonstrated at two different enzyme loadings.
  • the data in FIG. 13 also shows that doubling the enzyme loading resulted in almost half the level of unhydrolyzed starch remaining in the solids whether a high temperature stage was applied during liquefaction or not.
  • Refrigerated product was warmed to approximately 50°C and 48 g was poured onto a filter assembly containing a 100 mesh screen and connected to a house vacuum source at between -15 in Hg and -20 in Hg.
  • the screen dish had an exposed screen surface area of 44 cm2 and was sealed inside a plastic filter housing provided by Nalgene® (Thermo Fisher Scientific, Rochester, NY).
  • the slurry was filtered to form a wet cake on the screen and a yellow cloudy filtrate of 40.4 g in the receiver bottle.
  • the wet cake was immediately washed in place with water and then discontinued while the vacuum source continued to pull any free moisture through the final washed cake. Filtration was ended when dripping ceased from the underside of the filter.
  • Lugol's solution consisting of 1 g of >99.99%> (trace metals basis) iodine, 2 g of ReagentPlus® grade (>99%) potassium iodide (both from Sigma- Aldrich, St. Louis, MO), and 17 g of house deionized water in the amount of one drop was added to samples of the filtrate, dried cake solids reslurried in water and a control sample of water. The filtrate turned dark blue or purple, the solids slurry turned very dark blue and the water became light amber in color. Any color darker than amber indicates presence of oligosaccharides greater than 12 units long.
  • House deionized water 200 g were charged into an open Parr Model 4635 1 liter pressure vessel (Moline, IL) and heated to a temperature of 85°C. The water was agitated with a magnetic stir bar. Dry ground corn (90 g) prepared as described in Example 1 were added spoon- wise. The pH was raised from 5.2 to near 6.0 with stock aqueous ammonia solution. Approximately 0.064 grams of Liquozyme® solution were added with a small calibrated pipette. The lid of the pressure vessel was sealed and the vessel was pressurized to 50 psig with house nitrogen. The agitated mixture was heated to 110°C within 6 minutes and held between 106 to 116°C for a total of 20 minutes. The heating was reduced, the pressure was relieved, and the vessel was opened. An additional 0.064 g of Liquozyme® was added and the temperature was held at 63-75°C for an additional 142 minutes.
  • the maximum cook temperature was 115°C
  • the enzyme was Liquozyme® and the slurry was held at or above 85°C for three hours.
  • the screening rate was measured and determined to be more than 0.1 gallons per minute per square foot of screen area.
  • Lipid analysis was conducted by conversion of the various fatty acid-containing compound classes to fatty acid methyl esters ("FAMEs") by transesterification. Glycerides and phospholipids were transesterified using sodium methoxide in methanol. Glycerides, phospholipids, and free fatty acids were transesterified using acetyl chloride in methanol. The resulting FAMEs were analyzed by gas chromatography using an Agilent 7890 GC fitted with a 30-m X 0.25 mm (i.d.) OMEGAWAXTM (Supelco, SigmaAldrich, St. Louis, MO) column after dilution in toluene/hexane (2:3) .
  • FAMEs fatty acid methyl esters
  • the oven temperature was increased from 160°C to 200°C at 5°C/min then 200°C to 250°C (hold for 10 min) at 10°C/min.
  • FAME peaks recorded via GC analysis were identified by their retention times, when compared to that of known methyl esters (MEs), and quantitated by comparing the FAME peak areas with that of the internal standard (CI 5:0 triglyceride, taken through the transesterifcation procedure with the sample) of known amount.
  • MEs methyl esters
  • the approximate amount (mg) of any fatty acid FAME (“mg FAME”) is calculated according to the formula: (area of the FAME peak for the specified fatty acid/ area of the 15:0 FAME peak) * (mg of the internal standard C15:0 FAME).
  • the FAME result can then be corrected to mg of the corresponding fatty acid by dividing by the appropriate molecular weight conversion factor of 1.052. All internal and reference standards are obtained from Nu-Chek Prep, Inc.
  • the fatty acid results obtained for samples transesterified using sodium methoxide in methanol are converted to the corresponding triglyceride levels by multiplying the molecular weight conversion factor of 1.045.
  • Triglycerides generally account for approximately 80 to 90% of the glycerides in the samples studies for this example, with the remainder being diglycerides. Monoglyceride and phospholipid contents are generally negligible.
  • the total fatty acid results obtained for a sample transesterified using acetyl chloride in methanol are corrected for glyceride content by subtracting the fatty acids determined for the same sample using the sodium methoxide procedure. The result is the free fatty acid content of the sample.
  • the distribution of the glyceride content is determined using thin layer chromatography.
  • a solution of the oil dissolved in 6: 1 chloroform/methanol is spotted near the bottom of a glass plate precoated with silica gel.
  • the spot is then chromatographed up the plate using a 70:30: 1 hexane/diethyl ether/acetic acid solvent system. Separated spots corresponding to monoglycerides, diglycerides, triglycerides, and phospholipids are then detected by staining the plate with iodine vapor.
  • the spots are then scraped off the plate, transesterified using the acetyl chloride in methanol procedure, and analyzed by gas chromatography.
  • the ratios of the totaled peak areas for each spot to the totaled peak areas for all the spots are the distribution of the various glycerides.
  • This example illustrated the removal of solids from stillage and extraction by desolventizer to recover fatty acids, esters, and triglycerides from the solids.
  • solids are separated from whole stillage and fed to a desolventizer where they are contacted with 1.1 tons/hr of steam.
  • the flow rates for the whole stillage wet cake (extractor feed), solvent, the extractor miscella, and extractor discharge solids are as shown in Table 10. Table values are short tons/hr.
  • desolventizer contains 0.55 tons/hr of hexane and 1.102 tons/hr of water. This stream is condensed and fed to a decanter.
  • the water-rich phase exiting the decanter contains about 360 ppm of hexane.
  • This stream is fed to a distillation column where the hexane is removed from the water-rich stream.
  • the hexane enriched stream exiting the top of the distillation column is condensed and fed to the decanter.
  • the organic-rich stream exiting the decanter is fed to a distillation column. Steam (11.02 tons/hr) is fed to the bottom of the distillation column.
  • Table 11 Table values are tons/hr. Table 11
  • Impeller Setting 144 mm.
  • the corn oil separate had 81% triglycerides, 6% free fatty acids, 4% diglyceride, and 5% total of phospholipids and monoglycerides as determined by the methods described in Example 18 and thin layer chromatography.

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EP11727620.4A 2010-06-18 2011-06-17 Methods and systems for removing undissolved solids prior to extractive fermentation in the production of butanol Withdrawn EP2582827A2 (en)

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US35629010P 2010-06-18 2010-06-18
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US37954610P 2010-09-02 2010-09-02
US201161440034P 2011-02-07 2011-02-07
US13/160,766 US9012190B2 (en) 2011-06-15 2011-06-15 Use of thiamine and nicotine adenine dinucleotide for butanol production
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Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9175315B2 (en) * 2010-06-18 2015-11-03 Butamax Advanced Biofuels Llc Production of alcohol esters and in situ product removal during alcohol fermentation
US20130040340A1 (en) * 2011-02-07 2013-02-14 E. I. Du Pont De Nemours And Company Production of alcohol esters in situ using alcohols and fatty acids produced by microorganisms
US8765425B2 (en) 2011-03-23 2014-07-01 Butamax Advanced Biofuels Llc In situ expression of lipase for enzymatic production of alcohol esters during fermentation
CA2829941A1 (en) * 2011-03-23 2012-09-27 Butamax(Tm) Advanced Biofuels Llc In situ expression of lipase for enzymatic production of alcohol esters during fermentation
KR20140092759A (ko) 2011-03-24 2014-07-24 부타맥스 어드밴스드 바이오퓨얼스 엘엘씨 숙주 세포 및 아이소부탄올의 제조 방법
JP2014516581A (ja) * 2011-06-17 2014-07-17 ビュータマックス・アドバンスド・バイオフューエルズ・エルエルシー バイオ燃料製造工程からの共産物及びその製造方法
US20130180164A1 (en) 2011-07-28 2013-07-18 Butamax(Tm) Advanced Biofuels Llc Low sulfur fuel compositions having improved lubricity
AU2012362274A1 (en) * 2011-12-30 2014-07-03 Butamax (Tm) Advanced Biofuels Llc Fermentative production of alcohols
ES2577052T3 (es) 2012-04-25 2016-07-12 Purac Biochem Bv Proceso de fermentación que incluye el uso de un hidrociclón
MX2014013321A (es) 2012-05-04 2015-02-10 Butamax Advanced Biofuels Llc Procesos y sistemas para la produccion y recuperacion de alcohol.
JP6226286B2 (ja) * 2012-06-21 2017-11-08 月島機械株式会社 バイオマスの処理装置および処理方法
BR112014032741B1 (pt) 2012-07-04 2022-01-25 Cooperatie Avebe U.A. Método para seletivamente preparar um éster de alquila de ácido graxo
US20140024064A1 (en) * 2012-07-23 2014-01-23 Butamax(Tm) Advanced Biofuels Llc Processes and systems for the production of fermentative alcohols
BR112015001433A2 (pt) * 2012-07-23 2018-08-28 Butamax Advanced Biofuels Llc método e sistema para a produção de um produto de fermentação.
MX2015003073A (es) * 2012-09-12 2015-07-14 Butamax Advanced Biofuels Llc Procesos y sistemas para la produccion de productos de fermentacion.
WO2014059273A1 (en) * 2012-10-11 2014-04-17 Butamax Advanced Biofuels Llc Processes and systems for the production of fermentation products
AU2014225436B2 (en) * 2013-03-07 2018-05-10 Genomatica, Inc. Downstream processing of fatty alcohol compositions produced by recombinant host cells
US9523104B2 (en) 2013-03-12 2016-12-20 Butamax Advanced Biofuels Llc Processes and systems for the production of alcohols
WO2014144728A1 (en) * 2013-03-15 2014-09-18 Butamax Advanced Biofuels Llc Method for production of butanol using extractive fermentation
JP2015037389A (ja) * 2013-08-19 2015-02-26 独立行政法人産業技術総合研究所 脂質分解酵素及び非イオン性界面活性剤添加によるリグノセルロース系バイオマスからの酵素糖化反応および同時糖化発酵の改善方法
RU2555537C2 (ru) * 2013-10-14 2015-07-10 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский государственный университет" Способ очистки гидролизатов лигноцеллюлозного сырья от ингибиторов ацетонобутилового брожения
US20160326551A1 (en) * 2013-12-31 2016-11-10 Butamax Advanced Biofuels Llc Isobutanol tolerance in yeast with an altered lipid profile
KR101485905B1 (ko) * 2014-10-06 2015-01-26 김준호 이산화탄소 감소효과를 갖는 지방산효소에너지 조성물 및 이의 제조방법
CA3021002A1 (en) 2016-07-22 2018-01-25 Vito Nv (Vlaamse Instelling Voor Technologisch Onderzoek Nv) Method and system for producing products by fermentation
CN108265088A (zh) * 2017-01-03 2018-07-10 北京化工大学 一种利用脂肪酶催化醇类发酵产物制备酯类化合物的方法
MY185732A (en) * 2017-03-20 2021-06-02 Lanzatech Inc A process and system for product recovery and cell recycle
EP3450564A1 (en) 2017-09-05 2019-03-06 Vito NV Method of producing organic solvents in a bioreactor
US11484842B2 (en) 2017-09-05 2022-11-01 Vito Nv Method and apparatus for in situ product recovery
CN108315359B (zh) * 2018-03-23 2021-07-27 安玉民 利用马铃薯秸秆制取酒精和调配饲料的方法
CN110645725A (zh) * 2019-09-29 2020-01-03 广东利人酒业有限公司 一种低温冷冻过滤系统
CN116508784B (zh) * 2023-05-11 2024-01-19 南京工业大学 棕榈酸在提高施氏假单胞菌在促进植物生长和减少农田土壤氧化亚氮排放中的应用

Family Cites Families (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57152890A (en) * 1981-03-16 1982-09-21 Nippon Kagaku Kikai Seizo Kk Alcoholic fermentation of syrup made from starch
JPS5992094A (ja) * 1982-11-18 1984-05-28 Agency Of Ind Science & Technol 有機廃棄物の嫌気性消化方法
JPS59216591A (ja) * 1983-05-23 1984-12-06 Chiyoda Chem Eng & Constr Co Ltd ブタノ−ルの製造法
JPS60172290A (ja) * 1984-02-17 1985-09-05 Kao Corp ブタノ−ルの製造方法
JPS61173786A (ja) * 1985-01-28 1986-08-05 Mitsui Eng & Shipbuild Co Ltd アルコ−ル発酵法
ATE47884T1 (de) * 1985-04-09 1989-11-15 Voest Alpine Ag Verfahren zur gleichzeitigen produktion von alkohol und proteinreichen futtermitteln.
US4865973A (en) * 1985-09-13 1989-09-12 Queen's University At Kingston Process for extractive fermentation
DE4230645C2 (de) 1992-09-12 1996-03-07 Bernd Hansen Ampulle
WO1995028476A1 (en) 1994-04-15 1995-10-26 Midwest Research Institute Recombinant zymomonas for pentose fermentation
US5712133A (en) 1994-04-15 1998-01-27 Midwest Research Institute Pentose fermentation by recombinant zymomonas
US5514583A (en) 1994-04-15 1996-05-07 Midwest Research Institute Recombinant zymomonas for pentose fermentation
US7223575B2 (en) 2000-05-01 2007-05-29 Midwest Research Institute Zymomonas pentose-sugar fermenting strains and uses thereof
JP2004208667A (ja) * 2003-01-06 2004-07-29 Minoru Morita バイオマス資源を利用したエタノール製造方法
CN1183238C (zh) * 2003-03-28 2005-01-05 刘阳 生物酶法制造植物油脂肪酸甲酯的新方法
US20070014905A1 (en) * 2003-06-30 2007-01-18 Purdue Research Foundation Starchy material processed to produce one or more products comprising starch, ethanol, sugar syrup, oil, protein, fiber, gluten meal, and mixtures thereof
WO2005100582A2 (en) * 2004-03-25 2005-10-27 Novozymes Inc. Methods for degrading or converting plant cell wall polysaccharides
TWI240384B (en) * 2004-04-16 2005-09-21 Powerchip Semiconductor Corp Method of manufacturing non-volatile memory cell
CA2603128C (en) 2005-04-12 2014-04-08 E.I. Du Pont De Nemours And Company Treatment of biomass to obtain fermentable sugars
US9297028B2 (en) 2005-09-29 2016-03-29 Butamax Advanced Biofuels Llc Fermentive production of four carbon alcohols
US8945899B2 (en) 2007-12-20 2015-02-03 Butamax Advanced Biofuels Llc Ketol-acid reductoisomerase using NADH
UA96928C2 (ru) 2005-10-26 2011-12-26 Э.И. Дю Пон Де Немур Энд Компани Ферментативное продуцирование спиртов с четырьмя атомами углерода
US7666282B2 (en) 2005-12-28 2010-02-23 E.I. Du Pont De Nemours And Company Process for providing ethanol
JP2007245096A (ja) * 2006-03-17 2007-09-27 Tokyo Electric Power Co Inc:The バイオマスから有用物質を製造する方法
CN101437948A (zh) * 2006-05-02 2009-05-20 纳幕尔杜邦公司 四碳醇的发酵生产
US8962298B2 (en) 2006-05-02 2015-02-24 Butamax Advanced Biofuels Llc Recombinant host cell comprising a diol dehydratase
DE102006040567A1 (de) * 2006-08-30 2008-03-06 Bayer Technology Services Gmbh Verfahren zur Herstellung von Bioethanol
WO2008039859A2 (en) 2006-09-26 2008-04-03 Verasun Energy Corporation Solvent extraction of oil from distillers dried grains and methods of using extraction products
US7741119B2 (en) 2006-09-28 2010-06-22 E. I. Du Pont De Nemours And Company Xylitol synthesis mutant of xylose-utilizing zymomonas for ethanol production
WO2008052991A2 (en) * 2006-10-31 2008-05-08 Dsm Ip Assets B.V. Butanol production in a eukaryotic cell
CN101595218A (zh) * 2006-10-31 2009-12-02 帝斯曼知识产权资产管理有限公司 在真核细胞中生产丁醇
WO2008115564A2 (en) 2007-03-19 2008-09-25 Jump2Go Interactive radio system and method
ES2426070T3 (es) 2007-04-18 2013-10-21 Butamax (Tm) Advanced Biofuels Llc Producción fermentativa de isobutanol utilizando enzimas cetol-ácido reductoisomerasas muy activas
JP2008278825A (ja) * 2007-05-11 2008-11-20 Chuo Kakoki Kk バイオエタノールの製造方法
US8192968B2 (en) * 2007-08-27 2012-06-05 Iogen Energy Corporation Method for the production of a fermentation product from a pretreated lignocellulosic feedstock
JP4707007B2 (ja) * 2007-10-05 2011-06-22 智浩 青戸 ヤーコンからエタノールを製造する方法及び装置
JP2009106258A (ja) * 2007-10-12 2009-05-21 Nippon Steel Engineering Co Ltd エタノール製造方法
CA2704539C (en) 2007-10-30 2014-12-23 E. I. Du Pont De Nemours And Company Zymomonas with improved ethanol production in medium containing concentrated sugars and acetate
US20110229942A1 (en) * 2007-12-13 2011-09-22 Glycos Biotechnologies, Incorporated Microbial Conversion of Oils and Fatty Acids to High-Value Chemicals
EP2222841B1 (en) 2007-12-20 2015-08-26 Butamax (TM) Advanced Biofuels LLC Ketol-acid reductoisomerase using nadh
EP2235193B1 (en) * 2007-12-23 2015-11-25 GEVO, Inc. Yeast organism producing isobutanol at a high yield
EP2238098A4 (en) 2007-12-27 2016-06-01 Gevo Inc RECOVERING HIGHER ALCOHOLS IN DILUTED AQUEOUS SOLUTIONS
WO2009089030A1 (en) * 2008-01-08 2009-07-16 Integroextraction, Inc. Dry-mill ethanol plant extraction enhancement
JP2009213449A (ja) * 2008-03-12 2009-09-24 Tokyo Electric Power Co Inc:The 油系植物バイオマス残渣を原料とする単糖類、エタノールの製造方法
US7998722B2 (en) 2008-03-27 2011-08-16 E. I. Du Pont De Nemours And Company Zymomonas with improved xylose utilization
US8188250B2 (en) 2008-04-28 2012-05-29 Butamax(Tm) Advanced Biofuels Llc Butanol dehydrogenase enzyme from the bacterium Achromobacter xylosoxidans
EP2657344B1 (en) * 2008-06-04 2016-04-27 Butamax (TM) Advanced Biofuels LLC Method for producing butanol using two-phase extractive fermentation
BRPI0909989A2 (pt) 2008-06-05 2021-06-22 Butamax Advanced Biofuels Llc célula de levedura recombinante e método para a produção de um produto
ES2521675T3 (es) 2008-09-29 2014-11-13 Butamax Advanced Biofuels Llc Identificación y uso de [2Fe-2S]-dihidroxi-ácido deshidratasas bacterianas
CN101418320B (zh) * 2008-12-10 2011-05-18 中国科学院微生物研究所 一种生产丁醇的方法
US8247208B2 (en) 2008-12-22 2012-08-21 Alliance For Sustainable Energy Llc Zymomonas with improved xylose utilization in stress conditions
CN102439162A (zh) * 2009-04-13 2012-05-02 布特马斯先进生物燃料有限责任公司 利用萃取发酵生产丁醇的方法
US9260708B2 (en) 2009-09-29 2016-02-16 Butamax Advanced Biofuels Llc Yeast production host cells
CA2779460A1 (en) * 2009-11-23 2011-05-26 Butamax(Tm) Advanced Biofuels Llc Method for producing butanol using extractive fermentation with osmolyte addition
US9175315B2 (en) * 2010-06-18 2015-11-03 Butamax Advanced Biofuels Llc Production of alcohol esters and in situ product removal during alcohol fermentation
US10079208B2 (en) 2016-07-28 2018-09-18 Globalfoundries Inc. IC structure with interface liner and methods of forming same

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2011160030A2 *

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