CN101942530A - Method for pretreating straw pentose hydrolyzate for fermentation - Google Patents
Method for pretreating straw pentose hydrolyzate for fermentation Download PDFInfo
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- CN101942530A CN101942530A CN2009100881018A CN200910088101A CN101942530A CN 101942530 A CN101942530 A CN 101942530A CN 2009100881018 A CN2009100881018 A CN 2009100881018A CN 200910088101 A CN200910088101 A CN 200910088101A CN 101942530 A CN101942530 A CN 101942530A
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- 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
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Abstract
The invention relates to a method for pretreating straw pentose hydrolyzate for fermentation. The method mainly comprises the following steps of: decompressing, distilling and separating pentose liquid to obtain furfural in the pentose liquid; and then separating weak acid and strong acid in the furfural through electroosmosis and ion exchange. The method has the advantage of separating to obtain a product with a high added value while improving the fermentability of the pentose liquid.
Description
Technical field
The invention belongs to field of fermentation engineering, particularly fermentation stalk five-carbon sugar hydrolyzed solution pretreatment process.
Background technology
The stalk of farm crop is a kind of important lignocellulose resource.The output of annual China stalk reaches more than 700,000,000 tons.Regrettably up to the present, these resources are not but well utilized.The main component of stalk comprises Mierocrystalline cellulose, hemicellulose and xylogen.With these component appropriate separation, and the research that is made full use of just actively carrying out at present (Willke, et al, Applied Microbiology and Biotechnology, 2004.66:131-142).
In the structural unit of stalk hemicellulose, the highest with five-carbon sugar unit content.Therefore, as previously mentioned, the main component in its hydrolyzed solution is based on five-carbon sugar.In the monose of occurring in nature, the amount of five-carbon sugar (comprising the five-carbon sugar unit) is only second to glucose.If can be, will open up abundant and the resource that can regenerated of reserves to fermentation industry them as the carbon source of microbial fermentation.A lot of researchs have been carried out in these aspects, such as five-carbon sugar zymamsis, lactic fermentation and acetone butanol fermentation or the like (Willke, et al, Applied Microbiology and Biotechnology, 2004.66:131-142).
In general, the method for special degraded five-carbon sugar mainly contains two kinds from lignocellulose.Comprise acid hydrolysis and through suitable pretreated enzymic hydrolysis (Palmqvist, et al, Bioresource Technology, 2000.74:p.25-33.).No matter which kind of method when producing five-carbon sugar liquid, all can produce some by products simultaneously.Such as furfural and some weak acid, acid hydrolysis process also can be introduced a large amount of strong acid ions in addition.These by products are disadvantageous often to fermentation.Common method is to carry out detoxification by proper method in the document, such as neutralization, and extraction, enzyme processing, charcoal absorption or the like (Frazer, et al, Biomass, 1989.18:31-42; Palmqvist, et al, Bioresource Technology, 2000.74:17-24).These methods can effectively improve the fermentability of five-carbon sugar liquid greatly.But weak point is that these methods are only paid close attention to removes these materials, and does not make full use of these resources.
Summary of the invention
The present invention developed a kind of with five-carbon sugar liquid through underpressure distillation separates with ion exchange treatment wherein furfural and sour method, when improving the liquid glucose fermentability, obtain high value-added product (comprising furfural, acetate and formic acid), and reclaim the sulfuric acid that hydrolysis is used.
Concrete steps are as follows:
1. will be the five-carbon sugar liquid of feedstock production is thrown vacuum distillation apparatus into pump heating kettle with the lignocellulose, keep 70～99 ℃ of temperature and vacuum tightness 0.02～0.05MPa, in vacuum still, carry out underpressure distillation, and obtain chaff aldehyde by condenser condenses and enter the furfural receiving tank.Distilled chaff aldehyde is through dehydration and the refining furfural product that obtains.
2. in by commercially available DSAV type electrodialysis unit, separate liquid glucose and acid ion through the five-carbon sugar liquid that takes off furfural.Separation condition: 20～30 ℃ of temperature, current density 800～1200A/m
2
3. the isolated acid solution of electrodialysis enters ion exchange column, uses the different acid groups in the weak base anion-exchange resin separation acid solution.Follow the difference of resin effect power to obtain sulfuric acid, formic acid and acetate respectively by different acid ions.
Description of drawings
Fig. 1 is a process flow sheet of the present invention, wherein: 1 heating kettle; 2 vacuum stills; 3 condensers; 4 furfural receiving tanks; 5 electrodialysis units; 6 reception tanks; 7 elutriant storage tanks; 8 ion exchange columns
Embodiment
Air-dry wheat straw is mixed 115 ℃ of hydrolysis 2 hours, the five-carbon sugar liquid of system with 0.5% sulfuric acid through 1: 7 solid-to-liquid ratio.The five-carbon sugar liquid that makes is introduced in the heating kettle of furfural distillation tower, 99 ℃ of holding temperatures, and vacuum tightness 0.02MPa underpressure distillation obtains chaff aldehyde, and chaff aldehyde obtains the furfural product by rectifying and dehydration.The acid ion of the five-carbon sugar liquid of underpressure distillation in passing through the electrodialysis unit separating liquid, separation condition: 30 ℃ of temperature, current density 800A/m
2Obtain sulfuric acid, formic acid and acetate by the ion exchange method separation and purification at last.The five-carbon sugar liquid of handling is as the fermention medium of Chemicals such as ethanol, acetone-butanol.
Air-dry straw is mixed 125 ℃ of hydrolysis 5 hours, the five-carbon sugar liquid of system with 0.3% sulfuric acid through 1: 7 solid-to-liquid ratio.The five-carbon sugar liquid that makes is introduced in the heating kettle of furfural distillation tower, 70 ℃ of holding temperatures, and vacuum tightness 0.05MPa underpressure distillation obtains chaff aldehyde, and chaff aldehyde obtains the furfural product by rectifying and dehydration.The acid ion of the five-carbon sugar liquid of underpressure distillation in passing through the electrodialysis unit separating liquid, separation condition: 20 ℃ of temperature, current density 1200A/m
2Obtain sulfuric acid, formic acid and acetate by the ion exchange method separation and purification at last.The five-carbon sugar liquid of handling is as the fermention medium of Chemicals such as ethanol, acetone-butanol.
Air-dry corn stalk is mixed 130 ℃ of hydrolysis 3 hours, the five-carbon sugar liquid of system with 0.5% sulfuric acid through 1: 6 solid-to-liquid ratio.The five-carbon sugar liquid that makes is introduced in the heating kettle of furfural distillation tower, 85 ℃ of holding temperatures, and vacuum tightness 0.04MPa underpressure distillation obtains chaff aldehyde, and chaff aldehyde obtains the furfural product by rectifying and dehydration.The acid ion of the five-carbon sugar liquid of underpressure distillation in passing through the electrodialysis unit separating liquid, separation condition: 30 ℃ of temperature, current density 800A/m
2Obtain sulfuric acid, formic acid and acetate by the ion exchange method separation and purification at last.The five-carbon sugar liquid of handling is as the fermention medium of Chemicals such as ethanol, acetone-butanol.
Claims (5)
1. fermentation is characterized in that comprising following steps with stalk five-carbon sugar hydrolyzed solution pretreatment process,
1) with stalk five-carbon sugar hydrolyzed solution by the furfural distillation tower of gac is housed, and obtain the furfural product by underpressure distillation and dehydration;
2) behind the five-carbon sugar hydrolyzed solution process furfural distillation tower, by electrodialysis unit separation acid ion wherein;
3) electrodialysis separates the acid solution obtain and isolates formic acid, acetate and sulfuric acid by ion exchange method.
2. method according to claim 1 is characterized in that, the liquid glucose that used five-carbon sugar liquid obtains for the stalk dilute acid hydrolysis.
3. according to claim 1, the described method of step 1) is characterized in that using underpressure distillation, 70～99 ℃ of temperature, vacuum tightness 0.02～0.05MPa.
4. according to claim 1, step 2) described method, it is characterized in that using the acid ion in the electrodialysis unit separating liquid, separation condition is: 20～30 ℃ of temperature, current density 800～1200A/m
2
5. according to claim 1, the described method of step 3) is characterized by and uses weak base anion-exchange resin as separating medium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100881018A CN101942530B (en) | 2009-07-06 | 2009-07-06 | Method for pretreating straw pentose hydrolyzate for fermentation |
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| CN2009100881018A CN101942530B (en) | 2009-07-06 | 2009-07-06 | Method for pretreating straw pentose hydrolyzate for fermentation |
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| CN101942530A true CN101942530A (en) | 2011-01-12 |
| CN101942530B CN101942530B (en) | 2013-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350369A (en) * | 2015-12-08 | 2016-02-24 | 中国科学院青岛生物能源与过程研究所 | Preparation process of lignocellulose pulping pre-hydrolysis liquid having efficient fermentation capability |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI117633B (en) * | 2000-12-29 | 2006-12-29 | Chempolis Oy | Recovery and manufacture of chemicals in mass production |
| CN1304584C (en) * | 2004-07-09 | 2007-03-14 | 哈尔滨工业大学 | Method for preparing lactic acid and feedstuff concurrent with crop straw fermentation |
| CN101235392A (en) * | 2008-01-16 | 2008-08-06 | 柏晓东 | Cellulose fuel ethanol and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105350369A (en) * | 2015-12-08 | 2016-02-24 | 中国科学院青岛生物能源与过程研究所 | Preparation process of lignocellulose pulping pre-hydrolysis liquid having efficient fermentation capability |
| CN105350369B (en) * | 2015-12-08 | 2017-06-06 | 中国科学院青岛生物能源与过程研究所 | The preparation technology of the lignocellulosic slurrying pre-hydrolyzed solution with high-efficiency fermenting ability |
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Effective date of registration: 20110324 Address after: 100190 Beijing, Zhongguancun, north of No. two, No. 1, No. Applicant after: Institute of Process Engineering, Chinese Academy of Sciences Co-applicant after: Songyuan Laihe Chemicals Co., Ltd. Address before: 100190 Beijing, Zhongguancun, north of No. two, No. 1, No. Applicant before: Institute of Process Engineering, Chinese Academy of Sciences Co-applicant before: Hongkong Laihe Biotechnology Co., Ltd. |
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Owner name: LAIHE ROCKLEY BIO-CHEMICALS CO., LTD. Free format text: FORMER OWNER: SONGYUAN LAIHE CHEMICALS CO., LTD. Effective date: 20140528 |
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