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Acid and alkali combination pretreatment method of straw efficient saccharification

A pretreatment and straw technology, applied in the production of sugar, sugar production, lactose production, etc., can solve the problems of long pretreatment process and large energy consumption, and achieve the goal of improving efficiency, reducing decomposition loss and improving enzymatic hydrolysis efficiency. Effect

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method reduces the amount of inorganic metal salt used, the straw must be soaked for a long time, at least six hours, before the acidification reaction, so the pretreatment process is long, and continuous heating is required during the soaking process, which consumes energy. Big

Method used

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  • Acid and alkali combination pretreatment method of straw efficient saccharification

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Experimental program
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Effect test

Embodiment 1

[0025] Mix crushed and sieved corn stalk particles (4-10 mesh), mass fraction 0.5% sulfuric acid, mass fraction 0.003% ferric chloride, mass fraction 0.05% hydrogen peroxide, wherein the mass concentration of straw particles is 10%, and heat up to 160 °C for 10 minutes, then lower the temperature to 120 °C for another 10 minutes, then lower the temperature to terminate the reaction. After the reaction mixture is cooled, it is extruded and filtered, and the filtrate is neutralized and filtered to obtain a hemicellulose sugar hydrolyzate. The mass concentration of the hemicellulose sugar (xylose+galactose+arabinose) liquid is 2.21%. The conversion rate of hemicellulose into monosaccharide was 88.4%. The filter residue was mixed with a mass fraction of 0.4% NaOH solution and soaked for 24 hours, wherein the solid concentration of the filter residue was 15%. After the end, the mixture was quickly squeezed and filtered, and the filter residue was washed with water and then added wi...

Embodiment 2

[0029] Mix crushed and sieved corn stalk particles (4-10 mesh), mass fraction 0.2% sulfuric acid, mass fraction 0.025% ferric chloride, mass fraction 0.2% hydrogen peroxide, wherein the mass concentration of straw particles is 15%, and heat up to 170 °C, react for 5 minutes, then lower the temperature to 110 °C, and proceed for another 30 minutes, then lower the temperature to terminate the reaction. After the reaction mixture is cooled, it is extruded and filtered, and the filtrate is neutralized and filtered to obtain a hemicellulose sugar hydrolyzate. The mass concentration of the hemicellulose sugar (xylose+galactose+arabinose) liquid is 1.90%. The conversion rate of hemicellulose into monosaccharide was 76.0%. Mix the filter residue with a mass fraction of 1% NaOH solution and soak for 15 hours, wherein the solid concentration of the filter residue is 20%. After the end, quickly squeeze and filter the above mixture. After the filter residue is washed with water, add cellu...

Embodiment 3

[0031]Mix crushed and sieved corn stalk particles (4-10 mesh), mass fraction 0.9% sulfuric acid, mass fraction 0.025% ferric chloride, mass fraction 0.05% hydrogen peroxide, wherein the mass concentration of straw particles is 10%, and heat up to 160 °C, react for 10 minutes, then lower the temperature to 130 °C, and proceed for another 5 minutes, then lower the temperature to terminate the reaction. After the reaction mixture is cooled, it is extruded and filtered, and the filtrate is neutralized and filtered to obtain a hemicellulose sugar hydrolyzate, and the mass concentration of the hemicellulose sugar (xylose+galactose+arabinose) liquid is 2.08%. The conversion rate of hemicellulose into monosaccharide was 83.2%. The filter residue was mixed with a mass fraction of 1% NaOH solution and soaked for 4 hours, wherein the solid concentration of the filter residue was 10%, and the above-mentioned mixture was squeezed and filtered quickly after the end, and the filter residue w...

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Abstract

The invention discloses an acid and alkali combination pretreatment method of straw efficient saccharification, which comprises the following steps that: firstly, raw material slurry consisting of straw particles, inorganic metal salt, inorganic acid and peroxide takes reaction for 1 to 50 minutes at 100 DEG C to 200 DEG C, then, the temperature is reduced, the reaction stops, finally, solid and liquid products are separated, the liquid product is hydrolytic liquid glucose, the solid product is soaked for 1 to 30 hours by alkali solution with the mass concentration being 0.1 percent to 1.5 percent, and solids obtained through solid and liquid separation after the soaking are used as enzymolysis raw materials. The acid and alkali combination pretreatment method is used, the operation flow process is simple, the treatment time is short, the energy consumption is low, the straw utilization rate is high, and the cellulase enzymolysis effect is good.

Description

technical field [0001] The invention relates to an acid-base combined pretreatment method for efficient saccharification of straw, in particular to a pretreatment method for improving efficient saccharification of cellulose and hemicellulose in straw. Background technique [0002] The main chemical components of straw are cellulose, hemicellulose, and lignin, and the total weight of the above three substances is basically kept at about 70%. Degrading cellulose and hemicellulose into sugars mainly glucose and xylose and converting them into liquid fuels and chemical raw materials is one of the ideal ways to efficiently utilize straw. [0003] Enzymatic hydrolysis is one of the effective means of straw saccharification, mainly using cellulase to convert cellulose in straw into usable glucose. The important factors affecting the saccharification efficiency, saccharification speed and hydrolyzed sugar composition in the enzymatic saccharification process are the lignin and hemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00C13K5/00C12P19/14
Inventor 王鑫黎元生佟明友
Owner CHINA PETROLEUM & CHEM CORP
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