WO2003056038A1 - Method for the recovery of sugars - Google Patents
Method for the recovery of sugars Download PDFInfo
- Publication number
- WO2003056038A1 WO2003056038A1 PCT/FI2002/001059 FI0201059W WO03056038A1 WO 2003056038 A1 WO2003056038 A1 WO 2003056038A1 FI 0201059 W FI0201059 W FI 0201059W WO 03056038 A1 WO03056038 A1 WO 03056038A1
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- WO
- WIPO (PCT)
- Prior art keywords
- mannose
- separation
- chromatographic
- chromatographic separation
- fraction
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B20/00—Purification of sugar juices
- C13B20/14—Purification of sugar juices using ion-exchange materials
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B20/00—Purification of sugar juices
- C13B20/14—Purification of sugar juices using ion-exchange materials
- C13B20/144—Purification of sugar juices using ion-exchange materials using only cationic ion-exchange material
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13K—SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES
- C13K13/00—Sugars not otherwise provided for in this class
- C13K13/007—Separation of sugars provided for in subclass C13K
Definitions
- the present invention relates to a chromatographic separation method of separating carbohydrates, especially sugars, from a mixture includ- ing the same.
- the mixture to be treated in accordance with the present invention is typically a biomass-derived solution including carbohydrates/sugars.
- the invention provides a chromatographic separation method of recovering mannose with high purity from biomass-derived solutions, such as spent sulphite pulping liquors.
- Mannose can be recovered in a crystalline form or in the form of a solution.
- the claimed process of recovering mannose is based on the use of a combination of a Ba 2+ form resin and a resin in other than Ba 2+ form as the separation resin, whereafter mannose is crystallized, if desired.
- xylose and arabinose products can also be obtained as by-products, depending on the composition of the starting biomass-derived solution.
- Mannose is useful e.g. for various pharmaceutical applications. It can be used as a starting material or raw material for various pharmaceutical products. Mannose is also therapeutically useful in the treatment of urine infections and intravenous inflammation conditions. In food technology, man- nose is useful e.g. for so-called Positech applications (GMO-testing of food products).
- Mannose is also useful as the raw material for the production of mannitol, which has various pharmaceutical applications.
- Mannose can be recovered from wood resources, where mannose is present as a mixture with other carbohydrates and lignin components.
- mannose typically occurs in polymeric form, such as hemicellulose, most frequently as a heteropolymer with glucose and/or galactose in glucomannans, galactoglucomannans and galactoman- nans.
- Spent liquors obtained from conifer wood-pulping processes are espe- cially rich in mannose.
- Mannose has also been recovered from vegetable ivory nuts and specific seaweeds.
- Herrick, F.W., Casebier, R.L., Hamilton, J.K. & Wilson, J.D. disclose a study relating to the development of an economic process for recovering mannose or its derivatives from wood resources, such as a spent sulphite liquor, where mannose is a major component of mixtures containing other carbohydrates and lignin fragments.
- the main achievement of this work was the development of processes for recovering sodium mannose bisulphite and methyl mannoside from several raw materials.
- Processes were developed for recovering mannose from crude mixtures via two routes: (1 ) formation of the sodium bisulphite adducts of monomeric wood sugar mixtures, crystalliza- tion and separation of sodium mannose bisulphite and regeneration of mannose from this intermediate, and (2) anhydrous methanolysis concurrent with glycosidation of crude mixed-sugar polymers or monomers, crystallization and separation of methyl ⁇ -D mannoside and regeneration of mannose from this intermediate.
- These procedures for recovering mannose have the drawback that they are very cumbersome to carry out in practice.
- GB 1 540 556 (ICI Americas, publ. 14 February 1979) relates to a method of separating mannose from glucose present in aqueous solutions.
- the starting mixture of glucose and mannose is typically obtained by epimeri- zation of glucose in an aqueous solution.
- the separation of mannose from glucose is typically carried out using a cation exchange resin in the form of an alkaline earth metal salt, such as in Ca 2+ , Sr 2+ or Ba 2+ form.
- the cation ex- change resin is preferably a strongly acid cation exchange resin, typically a resin based on styrene divinylbenzene.
- the resin used in the tests was a strongly acid gel-type polysty- rene cation exchange resin (Amberlite IR-120, Ca 2+ form). It is proposed that the sugar fraction might be used as a raw material source for mannitol produc- tion.
- Finnish Patent 78734 (Suomen Sokeri Oy, publ. 5 April 1987) relates to a multi-step process of separating sugars and lignosulphonates from a spent sulphite pulping liquor.
- This process comprises introducing a spent sul- phite pulping liquor into a chromatographic column including a separation resin in a metal salt form, typically a strongly acid cation exchange resin in a Ca 2+ form, eluting the column with water to recover a fraction rich in lignosulphonates and a fraction rich in sugars, introducing the fraction rich in sugars thus obtained into another chromatographic column including a separation resin in a monovalent metal salt form, typically in Na + form.
- a sugar fraction free from lignosulphonates is obtained.
- WO 96/27029 (Xyrofin Oy, publ. 6 September 1996) relates to a method of recovering an organic compound, such as sugars, from solutions by crystallizing the compound substantially by way of nucleation. It is proposed that mannose can be recovered by the nucleation crystallization process, for example.
- Finnish Patent 97 625 (Xyrofin Oy, publ. 5 March 1996) discloses a process for crystallizing xylose.
- xylose is recovered by crystallization from solutions in which the xylose purity is relatively low.
- this process concerns recovering xylose from biomass-derived solutions.
- WO 99/10542 discloses a process of recovering L-arabinose from sugar beet pulp by a chromatographic separation method using a cation exchanger in a monovalent metal form as the separation resin.
- the L-arabinose solution thus obtained is purified by means of cation and anion exchangers and adsorbent resins.
- WO 01/21271 A1 discloses a method of recovering pectin, arabinose and salts from vegetable material using a cation exchange resin, which is preferably in the form of a multivalent metal.
- Biomass-derived raw materials used for the recovery of mannose are typically complex multicomponent mixtures. Separation of mannose with sufficient purity from these complex mixtures has presented a problem.
- One of the problems associated with the above-described known processes is that they provide mannose as a mixture with other closely-related sugars or that they do not provide mannose with a sufficient degree of purity.
- the production of mannose from mannans and other mannose deriva- tives is technically very cumbersome.
- mannose with high purity can be effec- tively recovered from biomass-derived carbohydrate-containing solutions using a novel chromatographic separation method.
- a mannose fraction having a purity of 45 to 80% or more can be obtained.
- the mannose fraction obtained from the chromatographic separation can then be further purified by crystallization.
- the crystal- lization provides a crystalline mannose product having a purity of up to 99% or more.
- various other sugars, such as xylose and arabinose can be recovered as by-products, depending on the composition of the starting biomass-derived raw material.
- the invention is based on the idea of purifying the mannose- containing carbohydrate mixture chromatographically using at least two separation resins, one of which is Ba 2+ -based resin. With the method of the invention, a mannose product with high purity can be obtained.
- SAC refers to a strongly acid cation exchange resin.
- DS refers to a dry substance content measured by Karl Fischer titration, expressed as % by weight.
- RDS refers to a refractometric dry substance content, expressed as % by weight.
- Figure 1 is a graphical presentation of the concentration profile of the mannose-arabinose separation with Na + form SAC resin (separation A) of Example 1.
- Figure 2 is a graphical presentation of the concentration profile of the mannose separation with Ba 2+ form SAC resin (separation C.1 ) of Example 1.
- Figure 3 is a graphical presentation of the concentration profile of the repeated mannose separation with Ba 2+ form SAC resin (separation C.2) of Example 1.
- Figure 4 is a graphical presentation of the concentration profile of the mannose separation with Ca 2+ form SAC resin (separation C.3) of Example 1.
- Figure 5 is a graphical presentation of the concentration profile of the arabinose separation with Ca 2+ form SAC resin (separation E.1 ) of Example 1.
- Figure 6 is a graphical presentation of the concentration profile of the repeated arabinose separation with Ca 2+ form SAC resin (separation E.2) of Example 1.
- Figure 7 is a process scheme describing one embodiment of the invention for recovering mannose and xylose. The process also includes separation of arabinose as a pre-treatment step.
- the invention relates to a method of recovering mannose from a so- lution containing the same.
- the method of the invention is characterized in that said mixture is subjected to a chromatographic separation process using at least one chromatographic separation resin bed which is at least partly in a Ba 2+ form and at least one chromatographic separation resin bed which is in other than Ba 2+ form and recovering at least one mannose fraction.
- the chromatographic separation process of the invention typically comprises at least two chromatographic separation steps, whereby at least one of these steps is carried out with a chromatographic separation resin bed which is at least partly in a Ba 2+ form and at least one of these steps is carried out with a chromatographic separation resin bed which is in other than Ba 2+ form.
- One embodiment of the invention is typically carried out by feeding a solution containing mannose into a first chromatographic column including a chromatographic separation resin bed which is at least partly in a Ba 2+ form, eluting said column with an eluant, recovering a first mannose fraction, and then feeding said first mannose fraction into a second chromatographic column including a chromatographic separation resin bed in other than Ba 2+ form, eluting said column with an eluant, and recovering a second mannose fraction.
- said chromatographic separation process comprises two separation steps with a chromatographic separation resin bed which is at least partly in a Ba 2+ form and one separation step with a chromatographic separation resin bed in other than Ba 2+ form.
- This embodiment of the invention is typically carried out by feeding a solution containing mannose into a first chromatographic column including a chromatographic separation resin bed which is at least partly in a Ba 2+ form, eluting said column with an eluant, recovering a first mannose fraction, feeding said first mannose fraction into a second chromatographic column including a chromatographic separation resin bed which is at least partly in a Ba 2+ form, eluting said column with an eluant, recovering a second mannose fraction, and then feeding said second mannose fraction into a third chromatographic col- umn including a chromatographic separation resin bed in other than Ba 2+ form, eluting said column with an eluant, and recovering a third mannose fraction.
- some other separation may be carried out before the Ba 2+ separation. In the same way, some other separation may be carried out between the Ba 2+ separations.
- Fur- thermore between two ion exchange operations, equilibration of the ions or the ion composition is typically carried out, for example by ion exchange.
- said resin (resin bed) which is at least partly in a Ba 2+ form is substantially in a Ba 2+ form.
- said resin bed which is at least partly in a Ba 2+ form may even contain other ions, such as H + , alkali metal cations, such as Na + and K + , and alkaline earth metal cations, such as Ca 2+ and Mg 2+ .
- Said resin which is at least partly in a Ba 2+ form refers to a cation exchange resin.
- Said resin (resin bed) in other than Ba 2+ form refers to a resin, which is in the form of a cation other than Ba 2+ .
- Said resin is typically a cation exchange resin, where the cation is in the hydrogen form (H + ), in NH + form or in the form of a metal selected from alkaline metals and alkaline earth metals, such as Na + , K + , Mg 2+ and Ca 2+ .
- An especially preferred metal is Ca 2+ .
- the chromatographic separation for obtaining mannose in accordance with the present invention is typically carried out with a strongly acid cation exchange resin.
- a preferred resin is a cross-linked styrene- divinylbenzene based resin.
- a suitable cross-linking degree of the resin is 1 to 20% by weight, preferably 3 to 8% by weight.
- the average particle size of the resin is normally 10 to 2000 ⁇ m, preferably 100 to 400 ⁇ m. Zeolite-based molecular sieves can also be used.
- the eluant used in the chromatographic separation according to the present invention is either water, a solvent, e.g. an alcohol, or a mixture thereof.
- a preferred eluant is water.
- the elution is preferably carried out at a temperature from 10 to 95°C, more preferably from 30 to 95 °C, most preferably from 55 to 85°C.
- the chromatographic separation method of the invention provides a mannose fraction where mannose is in a solution form.
- the mannose product obtained from the chromatographic separation has a typical purity of 45 to 80% mannose on RDS.
- recycle fractions of the chromatographic separation can also be used.
- the chromatographic separation method of the invention may fur- ther comprise one of more purification steps selected from membrane filtration, ion exchange, evaporation, filtration and derivatization. These purification steps may be carried out before, after or between said chromatographic separation step/steps.
- Ion exchange is typically carried out to purify the mannose- containing solution from SO - ions, for example.
- a mannose derivative is formed, whereafter mannose is regenerated from the derivative thus obtained.
- One example of useful mannose derivatives is N-phenyl-D-mannopyranosylamine.
- the mannose solution obtained from the chromatographic separation can be further purified by crystallization to obtain a crystalline mannose product.
- the crystallization is typically carried out using a solvent selected from water, alcohol and a mixture of water and alcohol. In a preferred embodiment of the invention, the crystallization is carried out with a mixture of ethanol and water.
- the crystallization is carried out by evaporating the mannose solu- tion or mannose syrup obtained from the chromatographic separation to an appropriate dry substance content (e.g. to RDS of about 85%).
- the boiling syrup may be seeded with mannose seed crystals.
- the seeds, if used, are suspended in a crystallization solvent, which may be either water, a solvent , e.g. an alcohol, or a mixture thereof.
- a typical crystallization solvent is ethanol.
- the crystallization solvent is added.
- the crystallization mass may then be allowed to stand for a period of time, preferably for 3 to 6 days, typically at room temperature, whereafter the crystals are filtered off.
- the filtration cake is washed with the crystallization solvent.
- Mannose crystals with a high purity are obtained.
- the crystallization provides crystalline mannose having a purity of over 90%, preferably over 95% and most preferably over 99% on RDS.
- the method of the invention may also comprise separation of other sugars, such as xylose, rhamnose and arabinose, depending on the composition of the starting mannose-containing solution.
- separation of other sug- ars is typically carried out before the separation of mannose.
- the method of the invention may thus comprise separation of xylose as a pretreatment step.
- the recovery of xylose may be carried out by various methods, e.g. through precipitation crystallization.
- the xylose precipitation crystallization is preferably carried out im- mediately before the chromatographic separation of mannose.
- the solution containing mannose and some xylose is subjected to a crystallization step.
- the precipitation crystallization of xylose is typically carried out by evaporating the solution to a desired dry substance content, seeding the solution with xylose seed crystals, and then cooling the crystallization mass according to a desired cooling program.
- the crystallization mass is filtered to obtain a xylose cake and man- nose-containing crystallization run-off.
- Xylose is recovered from the crystallization cake and the run-off containing mannose is subjected to the chromatographic purification described above for obtaining mannose with high purity in accordance with the present invention.
- the method of the invention may also comprise separation of arabinose, preferably as a pretreatment step.
- the separation of arabinose may be carried out before the precipitation crystallization of xylose.
- Chromatographic separation is typically used for the recovery of arabinose.
- the chromatographic separation of arabinose is preferably carried out using a chroma- tographic separation resin bed in the form of a monovalent cation, which is selected from hydrogen, ammonium and alkali metal cations. Said monovalent cation is typically selected from H + , Na + , K + and NH 4 + .
- An arabinose fraction is recovered.
- the chromatographic separation resin is preferably a strongly acid cation exchange resin.
- the arabinose fraction may be subjected to further chromatographic purification.
- the chromatographic purification of the arabinose fraction typically comprises at least one step using a chromatographic separation resin bed in the form of an alkaline earth metal, preferably Ca 2+ .
- the arabinose fraction thus obtained may also be crystallized.
- the method of the invention may also comprise separation of rhamnose as a pretreatment step. The separation of rhamnose is typically carried out before the separation of arabinose.
- the method of the invention may also comprise separation of xylose as a pretreatment step.
- the separation of xy- lose it typically carried out before the separation of arabinose.
- the method of the invention may also include further purification steps, such as membrane filtration, e.g. ultrafiltration and nanofiltration, ion exchange, evaporation and filtration to remove e.g. lignosulphonates, acids (organic acids and inorganic acids) and salts.
- the starting solution containing mannose is typically a mixture containing carbohydrates, such as sugars.
- the solution may contain, in addition to mannose, e.g. xylose, galactose, glucose, rhamnose, arabinose and fructose.
- the mixture may also contain disaccharides and higher saccharides.
- the material containing a mixture of carbohydrates is typically derived from a biomass, typically mannose-containing vegetable material, such as softwood or hardwood, straw, corn husks, corn cops, corn fibers and sugar beet.
- the starting material is as a rule used in the form of a hydrolysate obtained e.g. by prehydrolysis, total hydrolysis, steam hydrolysis, enzymatic hydrolysis or acid hydrolysis.
- the biomass hydrolysate used for the recovery of mannose in ac- cordance with the present invention is typically a spent liquor obtained from a pulping process.
- the spent liquor is especially a spent sulphite pulping liquor, which may be obtained by acid, basic or neutral sulphite pulping. If the biomass hydrolysate, e.g. the spent liquor contains mannose in polymeric form, the polymeric mannose can be hydrolysed by acids or enzymes before the chromatographic separation steps.
- a typical spent liquor useful in the present invention is a mannose- containing spent liquor, which is preferably obtained from acid sulphite pulping.
- the spent liquor may be obtained directly from sulphite pulping. It may also be a concentrated sulphite pulping liquor or a side-relief obtained from sulphite cooking. It may also be a mannose-containing fraction chromatographically obtained from a sulphite pulping liquor.
- the liquor to be treated may also be any other liquor obtained from the digestion or hydrolysis of biomass, typically a hydrolysate obtained from acid hydrolysis of lignocellulosic material.
- a hydrolysate may be obtained from lignocellulosic material for example by treatment with an inorganic acid, such as hydrochloric acid, sulphuric acid or sulphur dioxide, or by treatment with an organic acid, such as formic acid or acetic acid.
- a spent liquor obtained from solvent-based pulping, such as phenol-based pulping and ethanol-based pulping may also be used.
- the starting solution containing mannose may be e.g. a spent sulphite pulping liquor recovered after the separation of rhamnose.
- the starting solution may also be a spent sulphite pulping liquor recovered after the separation of xylose.
- the mannose product obtained in accordance with the present in- vention typically comprises D-mannose.
- DS refers to the dry substance content measured by Karl Fischer ti- tration, expressed as % by weight, unless otherwise indicated. The contents (expressed in % on DS) of various components of the fractions obtained from the chromatographic and other separations have been measured using the HPLC method.
- Example 1 A process scheme describing the multistep separation process of
- the starting liquor used in the first step of the process was a mannose-containing side stream separated from Ca 2+ based sulphite spent liquor after the recovery of xylose and rhamnose. Birch had been used as raw mate- rial for the sulphite pulping.
- the mannose-containing side stream recovered after the separation of rhamnose was subjected to chromatographic separation to obtain a mannose fraction and an arabinose fraction (chromatographic separation A).
- the mannose fraction was subjected to separation B (xylose precipitation crystalli- zation) to obtain a xylose cake and a crystallization run-off containing mannose.
- the mannose-containing run-off from the crystallization of xylose was subjected to three successive chromatographic separations (C.1), (C.2) and (C.3).
- the mannose fraction from the last chromatographic separation was subjected to mannose crystallization.
- the arabinose fraction from separation (A) was subjected to two successive chromatographic separations (E.1) and (E.2) for recovering purified arabinose.
- the starting mannose-containing liquor obtained after the separation of rhamnose had the following composition:
- composition of the mannose and arabinose fractions collected from separation (A) are set forth in Table 1.
- the mannose yield was 38% for mannose purity of 19 % on DS and xylose purity of 43 % on DS.
- the mannose fraction obtained from separation (A) and having a xylose content of about 43 % on DS was subjected to precipitation crystallization to separate xylose.
- the precipitation crystallization of xylose was carried out in pilot scale with one crystallizer of about 200 liters.
- the feed liquor was evaporated to a final DS of 87.5%.
- the batch was seeded in a boiling pan with xylose seed crystals.
- the mass was cooled down from 60°C to 31 °C in 48 hours and then the mass was held at 31°C for 24 hours. No dilutions were made.
- the mass was dropped down to a mingler and then filtrated.
- Table 2 The results of the xylose precipitation crystallization are set forth in Table 2.
- Table 2 shows the contents of various components in the crystallization feed, cake and run-off in % on DS.
- the mannose fraction was collected with a mannose yield of 70% and the total purity of 49 % on DS was obtained.
- the composition of the mannose and xylose fractions is presented in Table 3.
- composition of the mannose and xylose fractions from the first separation with Ba -2+ form SAC resin in % on DS
- a second Ba 2+ form SAC resin separation was used to purify the mannose fraction obtained from the previous step (separation C.1).
- the same separation conditions were used as in separation (C.1 ) above.
- the mannose fraction obtained from the separation had a purity of 63 % on DS with a mannose yield of 68%.
- the compositions of the mannose and xylose fractions in % on DS are set forth in Table 4.
- the xylose fraction still contained 40% mannose.
- the mannose fraction obtained from separation (C.2) was subjected to a further chromatographic separation using Ca 2+ form SAC resin.
- the separation was done using the following separation conditions:
- composition of the mannose fraction in % on DS is set forth in
- Mannose fraction purity of 80 % on DS was obtained with a mannose yield of 70%.
- concentration profile of separation (C.3) is presented in Figure 4.
- the mass was cooled down from a temperature of 30°C to a temperature of 25°C. 800 g ethanol was added slowly to the mass.
- the crystals were filtrated with a pressure filter.
- the filtration gave a cake purity of 93.0% (including solvent ethanol as impurity) and a mother liquor purity of 52.5% (including solvent ethanol as impurity). This corresponds to a mannose yield of 41 %.
- the crystal size was in the range of 10 to 20 ⁇ m.
- the filtration cake was washed twice with ethanol.
- the crystals were centrifuged and dried at 40°C for 24 hours.
- the crystals had a crystal water content of 0.3% and a mannose content of 99.9%.
- the mass was cooled down from a temperature of 30°C to a temperature of 20°C. 300 g ethanol was added slowly to the mass.
- the crystals were centrifuged.
- the centri- fuging gave a cake purity of 96.0% (including solvent ethanol as impurity).
- the centrifuging result corresponds to a 50% mannose yield.
- the crystal size was in the range of 30 to 50 ⁇ m.
- the centrifuging cake was washed twice with ethanol.
- the crystals were centrifuged and dried at 40°C for 24 hours.
- the crystal water content was analyzed to be 0.2%, and the crystal mannose content to be 99.7%.
- the mass was cooled down from a temperature of 60°C to a temperature of 25°C. After 6 days from seeding, the centrifuging cake gave a purity of 99.5%. The centrifuging result corresponds to a mannose yield of 30%.
- the crystal size was in the range of 30 to 50 ⁇ m.
- the arabinose fraction obtained from separation (A) had a purity of
- compositions of the feed, xylose and arabinose fractions in % on DS are set forth in Table 6. Table 6.
- composition of the feed, xylose and arabinose fractions from the first separation with Ca 2+ resin Composition of the feed, xylose and arabinose fractions from the first separation with Ca 2+ resin
- the arabinose fraction obtained from separation (E.1 ) was sub- jected to a annootthheerr ppuurriiffiiccaattiioonn wwiitthh aa CCaa 22++ form resin.
- the separation was done using the following separation conditions:
- composition of the feed, xylose and arabinose fractions in % on DS is set forth in Table 7.
- the arabinose was collected with an 85% yield.
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- Organic Chemistry (AREA)
- Saccharide Compounds (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
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Abstract
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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CA2472246A CA2472246C (en) | 2001-12-31 | 2002-12-30 | Method for the recovery of sugars |
EP02788021A EP1468121B1 (en) | 2001-12-31 | 2002-12-30 | Method for the recovery of sugars |
AU2002352310A AU2002352310A1 (en) | 2001-12-31 | 2002-12-30 | Method for the recovery of sugars |
AT02788021T ATE532881T1 (en) | 2001-12-31 | 2002-12-30 | METHOD FOR OBTAINING SUGAR |
KR1020047010359A KR100943835B1 (en) | 2001-12-31 | 2002-12-30 | Method for the recovery of sugars |
JP2003556555A JP5212761B2 (en) | 2001-12-31 | 2002-12-30 | How to recover sugar |
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FI20012605 | 2001-12-31 | ||
FI20012605A FI114553B (en) | 2001-12-31 | 2001-12-31 | Method for recovering sugars |
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WO2003056038A1 true WO2003056038A1 (en) | 2003-07-10 |
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JP (2) | JP5212761B2 (en) |
KR (1) | KR100943835B1 (en) |
CN (1) | CN100390301C (en) |
AT (1) | ATE532881T1 (en) |
AU (1) | AU2002352310A1 (en) |
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DE102007034621A1 (en) | 2007-07-25 | 2009-01-29 | Lanxess Deutschland Gmbh | Polyolreinigung |
US9068206B1 (en) * | 2009-03-03 | 2015-06-30 | Poet Research, Inc. | System for treatment of biomass to facilitate the production of ethanol |
US10752878B2 (en) | 2010-06-26 | 2020-08-25 | Virdia, Inc. | Sugar mixtures and methods for production and use thereof |
US9963673B2 (en) | 2010-06-26 | 2018-05-08 | Virdia, Inc. | Sugar mixtures and methods for production and use thereof |
EP2585823A4 (en) * | 2010-06-28 | 2017-07-19 | Virdia, Inc. | Methods and systems for processing a sucrose crop and sugar mixtures |
US10760138B2 (en) | 2010-06-28 | 2020-09-01 | Virdia, Inc. | Methods and systems for processing a sucrose crop and sugar mixtures |
US10240217B2 (en) | 2010-09-02 | 2019-03-26 | Virdia, Inc. | Methods and systems for processing sugar mixtures and resultant compositions |
US10876178B2 (en) | 2011-04-07 | 2020-12-29 | Virdia, Inc. | Lignocellulosic conversion processes and products |
US11667981B2 (en) | 2011-04-07 | 2023-06-06 | Virdia, Llc | Lignocellulosic conversion processes and products |
US11965220B2 (en) | 2012-05-03 | 2024-04-23 | Virdia, Llc | Methods for treating lignocellulosic materials |
US9441280B2 (en) | 2013-09-05 | 2016-09-13 | Dow Global Technologies Llc | Chromatographic separation of sugars using blend of cation exchange resins |
WO2015034643A1 (en) * | 2013-09-05 | 2015-03-12 | Dow Global Technologies Llc | Chromatographic separation of sugars using blend of cation exchange resins |
US11078548B2 (en) | 2015-01-07 | 2021-08-03 | Virdia, Llc | Method for producing xylitol by fermentation |
US11091815B2 (en) | 2015-05-27 | 2021-08-17 | Virdia, Llc | Integrated methods for treating lignocellulosic material |
Also Published As
Publication number | Publication date |
---|---|
JP2013056946A (en) | 2013-03-28 |
JP5212761B2 (en) | 2013-06-19 |
AU2002352310A1 (en) | 2003-07-15 |
CA2472246A1 (en) | 2003-07-10 |
JP2005513161A (en) | 2005-05-12 |
KR100943835B1 (en) | 2010-02-24 |
FI114553B (en) | 2004-11-15 |
EP1468121B1 (en) | 2011-11-09 |
EP1468121A1 (en) | 2004-10-20 |
CA2472246C (en) | 2011-09-20 |
CN1617939A (en) | 2005-05-18 |
ATE532881T1 (en) | 2011-11-15 |
FI20012605A (en) | 2003-07-01 |
KR20040096515A (en) | 2004-11-16 |
FI20012605A0 (en) | 2001-12-31 |
CN100390301C (en) | 2008-05-28 |
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