Process for preparing multicomponent liquid glucose and lignose while effectively hydrolyzing lignocellulosic biomass

A technology for lignocellulosic and sugar hydrolysis, applied in the field of bioengineering, can solve the problems of low solvent recovery rate, inability to remove lignin, immature technology, etc., achieve extensive economic and social benefits, promote sustainable development, The effect of reducing environmental pollution

Inactive Publication Date: 2008-10-15
NANJING UNIV OF TECH
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Problems solved by technology

However, concentrated sulfuric acid and concentrated hydrochloric acid are highly corrosive, require high equipment materials, and are seriously poisonous to the environment. Separation, recovery and re-concentration greatly increase the complexity and cost of the process.
(2) Dilute acid hydrolysis method generally adopts dilute sulfuric acid, dilute hydrochloric acid and dilute nitric acid (such as Chinese patents 200710029054.0, 02145150.8), which need to be hydrolyzed for a long time at high temperature (100-220 ° C), and dilute acid hydrolysis often only acts on half Cellulose can’t hydrolyze cellulose, nor can it remove lignin. The yield of hydrolyzed sugar is generally lower than 50%, accompanied by the degradation of monosaccharides. There are many by-products, which are harmful to fermentation. Various detoxification methods and processes are required. complex
(3) Organic acid hydrolysis generally adopts organic strong acids with low boiling points such as trifluoroacetic acid and trifluoromethanesulfonic acid (such as Chinese patent 200710037882.9), which can degrade hemicellulose into oligosaccharides and monosaccharides, and recover organic strong acids by distillation , but the hydrolysis time is longer (1-12 hours), the fluorine-containing organic strong acid is highly toxic, and the residues of trifluoroacetic acid and trifluoromethanesulfonic acid are very harmful to fermentation
The pretreatment means of present patent report comprises the following methods: (1) steam explosion method, process biomass raw material with high-pressure saturated steam (as U.S. Patent US4070232), then suddenly reduce pressure, make raw material burst and degrade, cause hemicellulose to degrade, make The solubility of cellulose is increased, but this method has less lignin dissolution, involves high-pressure equipment, and has high investment costs
(2) Dilute acid pretreatment method, dilute acid can directly hydrolyze hemicellulose to make the raw material porous, which is beneficial to increa...

Method used

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  • Process for preparing multicomponent liquid glucose and lignose while effectively hydrolyzing lignocellulosic biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Get the dry corn stalks, grind them to 40 mesh through mechanical grinding, get 5g corn stalk powder (24.7% of cellulose content, 20.1% of hemicellulose, 15.6% of lignin), add 85% phosphoric acid, the solid-liquid content is 12.5% ​​(w / v), the reaction solution was stirred and hydrolyzed at 50°C for 60 minutes, cooled to 30°C, added 50mL propyl acetate (10%w / v) and stirred for 10min, filtered, and the filter cake was washed with propyl acetate (10%w / v) v) Washing 3 times, merging the washing liquid and the filtrate, separating the layers, distilling the organic phase under reduced pressure to reclaim the extractant, the recovery rate of propyl acetate is 92%, and the lignin solid is precipitated, and centrifuged to obtain 0.73g of lignin ( Purity 96%), lignin removal rate 89.8%.

[0029] Use hot water to wash the cellulose solid, combine the washing liquid with the water phase after oil-water separation, add calcium carbonate to the solution for reaction, filter and se...

Embodiment 2

[0033] Get the dried corncob, grind it to 60 orders through mechanical grinding, get 5g corncob powder (29.8% of cellulose content, 32.4% of hemicellulose, 18.3% of lignin), add 80% phosphoric acid, solid-liquid content is 20% ( w / v), the reaction solution was stirred and hydrolyzed at 60°C for 30 minutes, cooled to 20°C, added ethyl acetate (20% w / v) and stirred and extracted for 30 minutes, filtered, the filter cake was washed 3 times with ethyl acetate, and combined The filtrate was separated and the organic phase was distilled under reduced pressure. The recovery rate of ethyl acetate was 95%. The precipitated lignin solid was filtered and dried to obtain 0.94 g of lignin (purity 95%), and the lignin removal rate was 97.4%.

[0034] Wash the cellulose solid with hot water, combine the washing liquid with the water phase separated from water and oil, add calcium carbonate to the solution for reaction, filter and separate the calcium phosphate precipitate from the hemicellul...

Embodiment 3

[0038] Get dry bagasse, through mechanical crushing to 20 orders, get 5g bagasse particles (cellulose content 38.2%, hemicellulose 22.5%, lignin 19.8%), add 50% phosphoric acid, solid-liquid content is 25% (w / v), the reaction solution was stirred and hydrolyzed at 40°C for 40 minutes, cooled to 30°C, added ethyl formate (30% w / v) and stirred and extracted for 20 minutes, filtered, the filter cake was washed twice with ethyl formate, and combined The filtrate was separated and the organic phase was distilled under reduced pressure. The recovery rate of ethyl formate was 85%. The precipitated lignin solid was centrifuged and dried to obtain 1.02 g of lignin (purity 93%), and the lignin removal rate was 96%.

[0039] Wash the cellulose solid with hot water, combine the washing liquid with the water phase after water and oil separation, add calcium hydroxide to the solution for reaction, filter and separate the calcium phosphate precipitate from the hemicellulose hydrolyzed sugar...

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Abstract

The invention discloses a method for efficiently hydrolyzing lignocellulosic biomass and synchronously preparing multi-component liquid glucose and lignin. The method comprises the steps that: the lignocellulosic biomass through physical crushing is added with phosphoric acid to perform acid hydrolysis; then organic solvent is added to extract the lignin, the layering and the phase separation are performed, then the lignin is extracted out while the organic solvent is reclaimed under the condition of pressure reduction and distillation; phosphoric acid can be reclaimed through steps such as neutralization, filtration, acidification and so on, hemicellulose hydrolyzed liquid glucose is obtained at the same time; and the remained cellulose undergoes the zymohydrolysis to prepare cellulosic hydrolyzed liquid glucose. The method can separate lignin, hemicellulose and cellulose, remarkably decreases the degree of crystallinity of the cellulose hydrolyzed by phosphoric acid, and remarkably improves the zymohydrolysis efficiency; and the prepared hydrolyzed liquid glucose does not contain fermentation inhibitors. The method has mild treatment conditions, simple process and less side reactions; the phosphoric acid and the organic solvent can both be reclaimed and circularly used; and the method is environment-friendly, and has broad social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of bioengineering, and relates to a method for efficiently hydrolyzing lignocellulosic biomass, which can simultaneously obtain cellulose hydrolyzate, hemicellulose hydrolyzate and lignin. Background technique [0002] Lignocellulosic biomass includes agricultural production waste and residues (such as crop straw, chaff, corncob, bran, bagasse, etc.), forest wood (softwood and hardwood) and forestry processing waste, grass, etc. The most abundant and cheapest renewable resource on earth. The main organic components of lignocellulosic raw materials include cellulose, hemicellulose and lignin. Among them, cellulose is mainly composed of glucose molecules linked by β-1,4 glycosidic bonds. Glucose can be produced by hydrolysis Hemicellulose is composed of polypentose, polyhexose and polyuronic acid, which can be hydrolyzed to produce xylose, arabinose, galactose, etc.; lignin is a natural polymer compound compo...

Claims

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Application Information

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IPC IPC(8): C13K1/02C07G1/00C08B37/14C12P19/00C12N9/42C01B17/96C08H7/00
Inventor 姜岷任晓乾雷丹吴昊李晖韦萍陈可泉
Owner NANJING UNIV OF TECH
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