Pretreatment method for efficiently saccharifying straws

A pretreatment and straw technology, applied in the direction of biofuel, fermentation, etc., can solve the problems of long pretreatment process and high energy consumption, and achieve the effect of simplifying the treatment process, reducing energy consumption and avoiding decomposition loss

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Pretreatment method for efficiently saccharifying straws

Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] 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, react for 10 minutes, then lower the temperature to 120 °C, react for another 10 minutes, and 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%. After the filter residue was washed with water, cellulase solution and buffer solution were added to make the solid-liquid ratio 1:10, the pH value was adjusted to 5.0, and hydrolysis was carried out at 50° C. for 72 hours. The dosage of cellulase was 20 FPU / gram of cell...

Embodiment 2

[0021] 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 ℃, reacted for 5 minutes, then lowered the temperature to 110°C, reacted for another 30 minutes, and lowered 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%. After the filter residue was washed with water, cellulase solution and buffer solution were added to make the solid-liquid ratio 1:10, the pH value was adjusted to 5.0, and hydrolysis was carried out at 50° C. for 72 hours. The dosage of cellulase was 20 FPU / gram of ...

Embodiment 3

[0023] 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, react for another 5 minutes, and 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%. After the filter residue was washed with water, cellulase solution and buffer solution were added to make the solid-liquid ratio 1:10, the pH value was adjusted to 5.0, and hydrolysis was carried out at 50° C. for 72 hours. The dosage of cellulase was 20 FPU / gram of c...

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Abstract

The invention discloses a pretreatment method for efficiently saccharifying straws, which comprises the following steps: firstly, carrying out acidification reaction on raw material serum comprising straw particles, a peroxide, inorganic salt and an inorganic acid at the temperature of 150-180 DEG C for 1-15min; then, cooling to 100-130 DEG C to continue to react for 1-30min; and finally, cooling to terminate the reaction, and separating a solid-liquid product, wherein a liquid product is hydrolysis sugar liquid, and a solid is an enzymolysis raw material. The pretreatment method for efficiently saccharifying the straws has a simple operation flow, short treatment time, low energy consumption, high straw use ratio and a good saccharifying effect.

Description

technical field [0001] The invention relates to a pretreatment method for high-efficiency saccharification of straw, in particular to a pretreatment method for improving high-efficiency 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 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 hemicellulose compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/02C12P7/10
CPCY02E50/16Y02E50/10
Inventor 王鑫黎元生佟明友
Owner CHINA PETROLEUM & CHEM CORP
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