WO2023203583A1 - Procédé de production d'éthanol par fermentation de substrat sursaturé et équipement associé - Google Patents

Procédé de production d'éthanol par fermentation de substrat sursaturé et équipement associé Download PDF

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Publication number
WO2023203583A1
WO2023203583A1 PCT/IN2023/050397 IN2023050397W WO2023203583A1 WO 2023203583 A1 WO2023203583 A1 WO 2023203583A1 IN 2023050397 W IN2023050397 W IN 2023050397W WO 2023203583 A1 WO2023203583 A1 WO 2023203583A1
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Prior art keywords
percolate
substrate
reactor
fermentation
biomass
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PCT/IN2023/050397
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English (en)
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Taraprakash Prabhakar Vartak
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Taraprakash Prabhakar Vartak
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Publication of WO2023203583A1 publication Critical patent/WO2023203583A1/fr

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    • 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
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/12—Bioreactors or fermenters specially adapted for specific uses for producing fuels or solvents
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M45/00—Means for pre-treatment of biological substances
    • C12M45/03—Means for pre-treatment of biological substances by control of the humidity or content of liquids; Drying
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M45/00—Means for pre-treatment of biological substances
    • C12M45/20—Heating; Cooling

Definitions

  • the present invention relates to production of ethanol and more particularly producing ethanol by oversaturated substrate fermentation.
  • Ethanol is produced using sugarcane, sugar beet, grains, starch or hydrolysates of lignocellulosic materials, corn kernels, wheat kernels, etc.
  • Sugarcane, sweet sorghum and other sugar-bearing stalks are non-food crops grown annually in large parts of world that are now considered for fuel ethanol production.
  • the conventional process of submerged fermentation has many drawbacks. It requires heavy machinery to ‘crush’ the tough mat. It is a capital- and energy-intensive equipment. Also, large quantity of water is required to maximize sugar extraction resulting in juice dilution. Clarification and evaporation of the dilute juice needs large heat energy.
  • the fermented wash obtained after the ethanol is distilled out, has high COD and BOD. Expensive equipment and high energy expenditure is required to treat this effluent.
  • the only saleable product is ethanol and the surplus bagasse is used mainly as low value fuel.
  • SSF solid state fermentation
  • the rotary fermenter achieves both mixing and removal of heat generated during fermentation, but requires large mechanical energy to move the solid biomass.
  • US Patent 4490469 to Kirby K.D. and others teaches a process for production of ethanol from sugar containing material using SSF.
  • the process requires mixing of suspension of yeast with the substrate, requiring large mechanical energy so as to assure intimate continuous contact between yeast and substrate particles.
  • the patent describes a step of ‘squeezing’ the fermented pulp requiring mechanical energy. This patented process results in liquid effluent.
  • the present invention discloses an oversaturated Substrate Fermentation process for producing ethanol by solid state substrate fermentation, the process is commercially known as OSFAYTM process. Accordingly, the process includes several stages for producing ethanol by solid state fermentation. The first stage is of preparation of rind/pith biomass 105, followed by a second stage of oversaturation of the biomass 110, and third stage of steam disinfection 115. The fourth stage is of cooling of the biomass 120, followed by fifth stage of inoculum addition 125. The next stage that is the sixth stage of fermentation 130, followed by a seventh stage of distillation 135 and finally, an eighth stage of dried biomass preparation 140.
  • the first stage of rind/pith biomass preparation 105 includes separating the outer rind of sugarcane and comminuting the inner soft portion, and feeding the mixture of rind and pith into a multipurpose Oversaturated Substrate Fermentation reactor i.e., OSFAYTM reactor 205.
  • the second stage of oversaturation of biomass 110 includes adding water to the reactor 205 enough to oversaturate the substrate 225 i.e., the rind / pith biomass mixture, obtaining a percolate of quantity between 15% to 25% of the substrate weight; and collecting this percolate in a jacketed percolate vessel 230.
  • the third stage of steam disinfection 115 includes heating the substrate 225 in the reactor 205 by steam from a boiler by direct injection of steam in the substrate at about 125°C or by passing steam in jackets 210, 215 and 220.
  • the percolate is recirculated by a pump 235 to the top of the reactor 205 by spray nozzles 250 and heated by the jackets 210, 215 and 220.
  • uniform heating of the substrate 225 is carried out till temperature of about 90°C is obtained.
  • the fourth stage of cooling of the biomass 120 includes circulating the cold water in all the jackets 210, 215 and 220 and recirculating the percolate on the substrate 225.
  • the fifth stage of inoculum addition 125 includes adding yeast inoculum to the percolate in the percolate vessel 230 and recirculating the percolate on the substrate 225 many times so that each of the substrate particle comes in contact with the inoculum for homogenous distribution of inoculum for initiation of the fermentation process.
  • the sixth stage of fermentation 130 includes fermenting the substrate 225 for about 24 hours by recirculating the percolate to the reactor 205 continuously assuring intimate contact of all substrate particles with the yeast inoculum.
  • the percolate coming out of reactor 205 is continuously cooled by circulating cold water in the jacket of the percolate vessel 230 to enable control over the fermentation temperature. Any nutrients or other ingredients are added to the substrate through the percolate ensuring uniform distribution of the ingredients.
  • the valve regulating the flow of percolate between the reactor 205 and the percolate vessel 230 is closed.
  • the seventh stage of distillation 135 includes passing steam through a lower jacket 215 of the reactor 205 and producing a first distillate containing about 25 to 50% ethanol.
  • the first distillate is sent to conventional fractionation column to obtain rectified spirit of about 94% ethanol or the ethanol vapors are directly sent to the fractionating column thereby obtaining 94% ethanol.
  • the eighth stage of dried biomass preparation 140 includes removing the residual biomass containing the absorbed liquid and fresh yeast cell mass from the reactor via an outlet 270.
  • the residual biomass is then sent to the drying equipment 275.
  • the dried mixture of rind pieces and pith is conveyed to a sieving equipment 280.
  • the rind and the pith are separated and stored in rind bin 285 and pith bin 290.
  • the equipment 200 for producing ethanol by oversaturated substrate fermentation process 100 includes an oversaturated substrate fermentation reactor i.e., OSFAYTM reactor 205 for carrying out the three phases of steam disinfection 115, fermentation 130 and distillation 135.
  • the equipment further includes reactor 205 for circulating steam and cooling water and has an upper jacket 210 for heating/cooling the upper portion of the reactor 205 and a lower jacket 215 for heating/cooling the lower portion of the reactor 205.
  • a percolate vessel 230 collects the percolate from oversaturated substrate.
  • a percolate vessel jacket 220 heats/cools the percolate vessel 230.
  • the equipment further has a pump 235 that pumps the percolate to the reactor 205 through spray nozzles 250.
  • a strainer 245 prevents the biomass particles from entering the percolate vessel 230.
  • a valve 240 isolates the reactor 205 and the percolate vessel 230.
  • An outlet for distillation vapor 255 leads the distillation vapor to a condenser 260 and the condensate is collected in a condensate vessel 265.
  • An outlet 270 removes the residual biomass mixture containing pith and rind pieces from the reactor 205 after distillation.
  • a drying equipment 275 dries the residual biomass.
  • a sieving equipment 280 sieves the dried biomass.
  • a rind bin 285 and a pith bin 290 is provided for separately collecting the separated matter.
  • the present invention advantageously overcomes the problem of removal of fermentation heat from poor heat conducting biomass as that in case of conventional Solid State Fermentation reactors.
  • the present invention eliminates the steps of cane milling, juice clarification, syrup making and liquid effluent treatment as in the conventional process, therefore leading to a considerable reduction in the capital cost as well as running and maintenance costs of the equipment.
  • FIG. 1 shows a plurality of stages in the Oversaturated Substrate Fermentation process 100 for producing ethanol by oversaturated substrate fermentation in accordance with the present invention
  • FIG. 2 shows the schematic representation of the equipment 200 for producing ethanol by oversaturated substrate fermentation in accordance with the present invention
  • FIG. 3 shows a schematic comparison of equipment 200 in accordance with the present invention with an equipment 300 used for conventional ethanol production processes known in the prior art.
  • references in the specification to "one embodiment” or “an embodiment” means that a particular feature, structure, characteristic, or function described in connection with the embodiment is included in at least one embodiment of the invention.
  • the appearances of the phrase “in one embodiment” in various places in the specification are not necessarily all referring to the same embodiment.
  • the present invention teaches a process for producing ethanol by oversaturated solid state substrate fermentation.
  • the present invention describes the equipment for carrying out the process for producing ethanol by oversaturated solid state substrate fermentation in accordance with the present invention.
  • the present invention describes a process for production of ethanol by subjecting a comminuted substrate material directly to disinfection, fermentation and distillation in a single Oversaturated Substrate Fermentation reactor i.e., OSFAYTM reactor.
  • OSFAYTM reactor Oversaturated Substrate Fermentation reactor
  • the process enables Zero Liquid Discharge (ZLD) and does not require any liquid effluent treatment. Further the steps of milling, juice clarification, evaporation, storage and dilution in conventional ethanol production are eliminated.
  • ZLD Zero Liquid Discharge
  • the present invention discloses an Oversaturated Substrate Fermentation process 100 for producing ethanol by oversaturated substrate fermentation, hereinafter referred to as “the OSFAY process 100” advantageously includes a plurality of stages for producing ethanol.
  • the OSFAY process 100 includes a first stage of rind/pith biomass preparation 105, a second stage of oversaturation of the biomass 110, a third stage of steam disinfection 115, a fourth stage of cooling of the biomass 120, a fifth stage of inoculum addition 125, a sixth stage of fermentation 130, a seventh stage of distillation 135, and an eighth stage of dried biomass preparation 140.
  • the stages are performed in an equipment 200 for producing ethanol by oversaturated substrate fermentation in accordance with the present invention.
  • the first stage of rind / pith biomass preparation 105 of the OSFAY process 100 includes separating the outer rind of sugarcane and comminuting the inner soft portion.
  • the first stage 105 is performed by a proprietary technology and equipment developed by an Indian company 4E Cane Multi Products (P) Ltd. for preparing rind/pith biomass from sugarcane including a sugarcane separation system 202 that removes the outer skin (Rind) of the sugarcane and converts the inner white pithy portion to a comminuted biomass of small (l-2mm) particles.
  • P Indian company 4E Cane Multi Products
  • the rind pieces have intact bamboo-like fibers that have higher lignin content as compared to soft, highly absorbent pith. As a result, all the juice remains absorbed in the comminuted pith. This absorbent property of the pith enables direct fermentation of the rind / pith biomass without conventional milling and imbibition process.
  • a mixture of rind and pith is prepared in the stage 105 by the sugarcane separation system 202, and is fed into a multipurpose Oversaturated Substrate Fermentation reactor i.e., OSFAYTM reactor 205.
  • the second stage of overs aturation of biomass 110 of the OSFAY process 100 includes adding water to the reactor enough to oversaturate the substrate i.e., the rind / pith biomass mixture. Further a percolate of quantity between 15% to 25% of the substrate weight is obtained. This percolate is collected in a jacketed percolate vessel.
  • the third stage of steam disinfection 115 of the OSFAY process 100 includes heating the substrate in the reactor by steam from a boiler.
  • the disinfection is carried out by direct injection of steam in the substrate at about 125°C or by passing steam in jackets.
  • the percolate that is heated by the jacket is recirculated by a pump to the top of the reactor by spray nozzles. This leads to uniform heating of the substrate till temperature of about 90°C is obtained.
  • a strainer arrests entry of the pith into the percolate vessel.
  • a valve is provided to isolate the reactor and percolate vessel and regulate the flow between them.
  • the stage of steam disinfection 115 disinfects the substrate.
  • the fourth stage of cooling of the biomass 120 of the OSFAY process 100 includes circulating the cold water in all the jackets along with the percolate being recirculated on the substrate. This stage of cooling of the biomass 120 cools the substrate to a temperature suitable for fermentation.
  • the fifth stage of inoculum addition 125 of the OSFAY process 100 includes adding yeast inoculum to the percolate in the percolate vessel. This percolate is then recirculated on the substrate many times so that each of the substrate particle comes in contact with the inoculum and the inoculum is distributed homogenously for initiation of the fermentation process.
  • the sixth stage of fermentation 130 of the OSFAY process 100 includes fermenting the substrate for about 24 hours.
  • the percolate is recirculated to the reactor intermittently or preferably continuously. This recirculation assures intimate continuous contact of all substrate particles with the yeast inoculum.
  • the temperature of percolate coming out of reactor increases because of heat of fermentation.
  • This percolate is continuously cooled by circulating cold water in the jacket of the percolate vessel. If required, the percolate can be heated, by circulating hot water in the jacket.
  • the recirculation of percolate enables controlling the fermentation temperature.
  • any nutrients or other ingredients can be added to the substrate, as per requirements, through the percolate ensuring uniform distribution of the ingredients. Further, after the fermentation is over, all the percolate is added back to the reactor and the valve regulating the flow of percolate between the reactor and the percolate vessel is closed.
  • the seventh stage of distillation 135 of the OSFAY Process 100 includes passing steam through the lower jacket of the reactor. This process is similar to pot still distillation and produces first distillate containing about 25 to 50% ethanol. This first distillate is sent to conventional fractionation column to obtain rectified spirit of about 94% ethanol. Alternatively, the ethanol vapors are directly sent to the fractionating column thereby obtaining 94% ethanol.
  • the eighth stage of dried biomass preparation 140 of the OSFAY process 100 includes post-fermentation processing of the biomass.
  • the residual biomass containing the absorbed liquid and fresh yeast cell mass is removed from the reactor via an outlet.
  • the residual biomass is further sent to drying equipment.
  • the dried mixture of rind pieces and pith is conveyed to a sieving equipment.
  • the rind and the pith are separated and are stored in separate bins for further use.
  • the OSFAY process 100 of the present invention is carried out by employing renewable crops like sweet sorghum and other sugar- bearing stalks.
  • the OSFAY process 100 of the present invention employs biomass substrates like conventionally prepared cane, sorghum, or saccharified biomass.
  • vacuum distillation is employed in the seventh stage of distillation 135 of the OSFAY process 100 to reduce heat energy required.
  • vacuum is employed from the beginning of the sixth stage of fermentation 130 of the OSFAY process 100 to minimize ethanol inhibition thereby minimizing the fermentation time.
  • the eighth stage of dried biomass preparation 140 in the OSFAY process 100 of the present invention is performed in a solar dryer alone or assisted by flue gases from a boiler.
  • thermic fluid is used in place of steam.
  • Figure 2 shows the OSFAY reactor 205 wherein the three phases of steam disinfection 115, fermentation 130 and distillation 135 in accordance with the OSFAY process 100 are carried out.
  • the OSFAY reactor 205 has jackets for circulating steam and cooling water.
  • An upper jacket 210 heats/cools the upper portion of the reactor 205, while a lower jacket 215 heats/cools the lower portion of the OSFAY reactor 205.
  • the OSFAY reactor 205 contains a substrate 225 that is a mixture of rind pieces and comminuted pith as prepared in the rind / pith biomass preparation phase 105.
  • the equipment 200 further has a percolate vessel 230 that collects the percolate as per the overs aturation of biomass 110 stage.
  • a percolate vessel jacket 220 heats/cools the percolate vessel 230.
  • the percolate vessel 230 can alternatively be positioned below the reactor 205 or as a lower part of the reactor 205.
  • a pump 235 pumps the percolate to the reactor 205 through spray nozzles 250.
  • a strainer 245 prevents the biomass particles from entering the percolate vessel 230.
  • a valve 240 isolates the reactor 205 and the percolate vessel 230.
  • An outlet for distillation vapor 255 leads the distillation vapor generated during the distillation stage 135 of the OSFAY process 100 to a condenser 260 and the condensate is collected in a condensate vessel 265.
  • the residual biomass mixture containing pith and rind pieces from the reactor 205 are removed via outlet 270.
  • the residual biomass is dried in a drying equipment 275, further sieved in a sieving equipment 280 that separately collects the matter in a rind bin 285 and a pith bin 290.
  • the equipment 200 includes the sugarcane separation system 202, the OSFAY reactor 205, the percolate vessel 230, the condenser 260 and the condensate vessel 265.
  • the equipment 300 required for conventional ethanol production process includes a cane preparation equipment 305, a cane milling equipment 310, a juice clarification equipment 315, a juice to syrup conversion equipment 320, a fermenter 325, distillation columns 330, rectified spirit vessel 335 and an effluent treatment equipment 340.
  • the present invention employs a sugarcane separation system 202 that removes the outer skin (Rind) of the sugarcane and converts the inner white pithy portion to a comminuted biomass of small (l-2mm) particles.
  • This eliminates the requirement of conventional cane milling equipment 310 and juice clarification equipment 315. Further the juice to syrup conversion equipment is not required as the juice is not diluted by addition of water to extract the sugar.
  • the three phases of steam disinfection 115, fermentation 130 and distillation are carried out in the OSFAY reactor 205. An effluent treatment equipment is not required as no liquid effluent is generated.
  • the OSFAY process 100 of the present invention eliminates the need of equipment used conventionally that includes a cane milling equipment 310, a juice clarification equipment 315, a juice to syrup conversion equipment 320, and an effluent treatment equipment 340. This considerably reduces capital cost as well as the running and maintenance costs.
  • EXAMPLE 1 PROCESS OF ETHANOL PRODUCTION BY OVERSATURATED SUBSTRATE FERMENTATION
  • a sugarcane separation system developed by a company 4E Cane Multi Products (P) Ltd. for preparing rind/pith biomass from sugarcane is employed to remove the outer skin (Rind) of the sugarcane and comminute the inner white pithy portion to a biomass of small (l-2mm) particles to prepare the rind/pith biomass.
  • Vitamind outer skin
  • rind thickness small particles
  • sugarcane is an agricultural produce, large variations in diameter, rind thickness and sugar content occur.
  • 1 ton of sugarcane yields 800 kg pith and 200 kg rind. Out of 100 parts of sugar in cane, 90 parts go with pith and 10 parts go with rind.
  • a percolate of quantity between 100 to 300 litres is obtained per Ton of sugarcane. This percolate is collected in a jacketed percolate vessel 230.
  • the substrate 225 is heated in the reactor 205 by steam from a boiler.
  • the disinfection is carried out by passing steam at about 125°C in jackets 210, 215 and 220.
  • the percolate heated by the jacket 220 is recirculated by a pump 235 to the top of the reactor 205 by spray nozzles 250. Uniform heating of the substrate 225 is carried out till a temperature of 90°C is obtained.
  • the strainer 245 arrests entry of the pith into the percolate vessel 230.
  • the valve 240 regulates the flow between the reactor 205 and the percolate vessel 230.
  • Next cold water having temperature between 25 to 30°C is circulated in all the jackets 210, 215 and 220 and the percolate is recirculated on the substrate 225.
  • the substrate 225 is cooled to a temperature 32 to 35°C suitable for fermentation.
  • Yeast inoculum of weight 0.1 per cent of sugarcane weight is added to the percolate in the percolate vessel 230.
  • 0.1 per cent yeast yields between 65 to 75 litres ethanol per ton of sugarcane.
  • the residual biomass containing the absorbed liquid and fresh yeast cell mass, of about one ton per ton of sugarcane is removed from the bottom of the OSFAY reactor 205 via outlet 270.
  • the residual biomass is dried by drying equipment 275.
  • the dried mixture of rind pieces and pith, about 130 to 160 kg per ton of sugarcane, is conveyed to a sieving equipment 280.
  • the rind and the pith are separated and are stored in rind bin 285 and a pith bin 290.
  • the present invention overcomes the problem of removal of fermentation heat from poor heat conducting biomass as that in case of conventional Solid State Fermentation reactors. Further, heavy machinery conventionally needed to ‘crush’ and/or ‘squeeze’ the tough cane is not required. In conventional processes, large quantity of water is required to be added to maximize sugar extraction resulting in dilution of the juice. Also further conventionally, clarification and evaporation of this dilute juice needs large heat energy. Further, the fermented wash obtained after the ethanol is distilled out has high COD and BOD. Therefore, expensive equipment and high energy expenditure is required to treat this effluent. In the present invention, as the steps of cane milling, juice clarification, syrup making and liquid effluent treatment are eliminated, there is considerable reduction in the capital cost as well as running and maintenance costs of the equipment.
  • the sieved soft pith containing yeast mass obtained after drying and sieving is a proteinaceous animal feed supplement that fetches better price than dry bagasse.
  • the intact rind separated during rind / pith biomass preparation 105 is used for making Oriented Strand boards or pulp or activated carbon or biochar.
  • sale of both the rind and proteinaceous pith are revenue streams in addition to ethanol sale.
  • Zero-Liquid-Discharge (ZLD) process of the present invention is environment friendly.
  • the equipment 200 can also be used for producing other biochemicals like enzymes. If the fermentation is aerobic, the percolate can be first saturated with oxygen and then pumped to the reactor.

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Abstract

La présente invention concerne un procédé de production d'éthanol au moyen d'un procédé de fermentation de substrat sursaturé, à savoir un procédé OSFAY™ et un réacteur OSFAY™ permettant la mise en œuvre du procédé. Le procédé OSFAY 100 comprend des étapes de préparation de biomasse d'écorce/moelle 105, une sursaturation de la biomasse 110, une désinfection à la vapeur 115, un refroidissement de la biomasse 120, un ajout d'inoculum 125, une fermentation 130, une distillation 135 et une préparation de biomasse séchée 140. Le procédé permet une production nulle de rejet liquide (ZLD) et ne nécessite aucun traitement d'effluents liquides. Dans le procédé OSFAY, les étapes de broyage, de clarification de jus, d'évaporation, de stockage et de dilution dans la production d'éthanol classique sont éliminées. La combinaison de coûts en capital et d'exécution inférieurs, ainsi que des flux de rentrées supplémentaires provenant de la vente de l'écorce et de la moelle permettent la construction de mini-distilleries, une proposition viable.
PCT/IN2023/050397 2022-04-23 2023-04-22 Procédé de production d'éthanol par fermentation de substrat sursaturé et équipement associé WO2023203583A1 (fr)

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IN202221022051 2022-04-23
IN202221052186 2022-09-13
IN202221052186 2022-09-13

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100248320A1 (en) * 2009-03-17 2010-09-30 Alltech, Inc. Compositions and methods for conversion of lignocellulosic material to fermentable sugars and products produced therefrom
CN102174589A (zh) * 2011-01-31 2011-09-07 中国科学院过程工程研究所 一种甘蔗制糖固态发酵联产化学品及综合利用的方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100248320A1 (en) * 2009-03-17 2010-09-30 Alltech, Inc. Compositions and methods for conversion of lignocellulosic material to fermentable sugars and products produced therefrom
CN102174589A (zh) * 2011-01-31 2011-09-07 中国科学院过程工程研究所 一种甘蔗制糖固态发酵联产化学品及综合利用的方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KHONNGAM, THIPSUDA ET AL.: "Bioconversion of sugarcane bagasse and dry spent yeast to ethanol through a sequential process consisting of solid-state fermentation, hydrolysis, and submerged fermentation.", BIOCHEMICAL ENGINEERING JOURNAL, vol. 150, 2019, pages 107284, XP085775105, DOI: 10.1016/j.bej.2019.107284 *
ZHENG, XIAOJIE ET AL.: "Efficient short-time hydrothermal depolymerization of sugarcane bagasse in one-pot for cellulosic ethanol production without solid-liquid separation, water washing, and detoxification.", BIORESOURCE TECHNOLOGY, vol. 339, 2021, pages 125575, XP086753968, DOI: 10.1016/j.biortech.2021.125575 *

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