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Method for hydrolyzing cellulose through cooperation between freezing pretreatment and straw carbon-based solid acid

A carbon-based solid acid, freezing pretreatment technology, applied in chemical instruments and methods, sugar production, chemical/physical processes, etc. The effect of low energy consumption and increased contact area

Inactive Publication Date: 2020-02-14
ENERGY & ENVIRONMENT RES INST OF HEILONGJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of low efficiency of solid acid catalyzed cellulose hydrolysis, the present invention provides a method for freezing pretreatment in cooperation with straw carbon-based solid acid to hydrolyze cellulose

Method used

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  • Method for hydrolyzing cellulose through cooperation between freezing pretreatment and straw carbon-based solid acid
  • Method for hydrolyzing cellulose through cooperation between freezing pretreatment and straw carbon-based solid acid

Examples

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Effect test

Embodiment 1

[0034] A method for freezing pretreatment in conjunction with straw carbon-based solid acid hydrolysis of cellulose, the steps are as follows:

[0035] Step 1. Freezing pretreatment and regeneration:

[0036] Mix the cellulose and sodium hydroxide solution evenly according to a certain mass-volume ratio, place it in the environment of -18 ~ -30 ℃ and freeze it for 24 hours, then take it out and thaw it naturally at room temperature, and stir;

[0037] Prepare a hydrochloric acid solution equal to the molar volume of the sodium hydroxide solution, mix the obtained thawed solution with the hydrochloric acid solution, make the mixed solution neutral, and generate white flocs in the mixed solution, which is regenerated cellulose;

[0038] Step 2, preparing straw carbon-based solid acid:

[0039] The straw is dried, pulverized, and sieved to obtain straw powder, and the straw powder is carbonized under the protection of nitrogen to obtain a black powder, and the black powder is gr...

Embodiment 2

[0043] A method for freezing pretreatment in conjunction with straw carbon-based solid acid hydrolysis of cellulose, the steps are as follows:

[0044] Step 1. Freezing pretreatment and regeneration:

[0045] According to the mass volume ratio of 0.01~0.08g: 1mL, mix the cellulose with the sodium hydroxide solution with a mass concentration of 1~9% evenly, place it in the environment of -18~-30℃ and freeze it for 24 hours, then take it out to the room temperature environment thaw, stir;

[0046] Prepare a hydrochloric acid solution equal to the molar volume of the sodium hydroxide solution, mix the obtained thawed solution with the hydrochloric acid solution, and stir rapidly to make the mixed solution neutral, and white flocs are formed in the mixed solution, which is regenerated cellulose ;

[0047] Step 2, preparing straw carbon-based solid acid:

[0048] The straw is dried, pulverized, and sieved to obtain straw powder, and the straw powder is carbonized under the prote...

Embodiment 3

[0052] A method for freezing pretreatment in conjunction with straw carbon-based solid acid hydrolysis of cellulose, the steps are as follows:

[0053] Step 1. Freezing pretreatment and regeneration:

[0054] According to the mass volume ratio of 0.01~0.08g: 1mL, mix the cellulose with the sodium hydroxide solution with a mass concentration of 1~9% evenly, place it in the environment of -18~-30℃ and freeze it for 24 hours, then take it out to the room temperature environment thaw, stir;

[0055] Prepare a hydrochloric acid solution equal to the molar volume of the sodium hydroxide solution, mix the obtained thawed solution with the hydrochloric acid solution, and stir rapidly to make the mixed solution neutral, and white flocs are formed in the mixed solution, which is regenerated cellulose ;

[0056] Step 2, preparing straw carbon-based solid acid:

[0057] The crop straw is dried, crushed, and passed through a 100-mesh sieve to obtain straw powder. The straw powder is place...

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Abstract

The invention relates to a method for hydrolyzing cellulose through cooperation between freezing pretreatment and straw carbon-based solid acid, belonging to the technical field of cellulose hydrolysis methods. The invention aims to solve the problem of low hydrolysis efficiency of cellulose catalyzed by solid acid. The method for hydrolyzing cellulose through cooperation between freezing pretreatment and straw carbon-based solid acid comprises the following steps: performing freezing pretreatment on cellulose in an environment with a temperature of -18 to -30 DEG C, performing regeneration through hydrochloric acid to obtain regenerated cellulose with low crystallinity, hydrolyzing the regenerated cellulose by using straw carbon-based solid acid obtained by carbonizing and sulfonating crop straws as a catalyst, and efficiently converting the cellulose into reducing sugar. According to the invention, the crystallinity of the cellulose obtained through pretreatment is reduced, a contactarea of the cellulose and the catalyst can be effectively increased, and the straw carbon-based solid acid prepared through the method is high in surface acid content and high in catalytic activity and can remarkably improve the hydrolysis efficiency of the cellulose. When the method is applied to northern cold regions, pretreatment cost can be further reduced.

Description

technical field [0001] The invention belongs to the technical field of cellulose hydrolysis methods, and in particular relates to a method for hydrolyzing cellulose with freezing pretreatment and straw carbon-based solid acid. Background technique [0002] With the increasing shortage of conventional energy sources, biomass energy has received extensive attention. Plants produce hundreds of millions of tons of cellulose through photosynthesis every year, and cellulose is composed of countless glucose units linked by glycosidic bonds and hydrogen bonds. Under certain conditions, cellulose can be converted into sugar substances through hydrolysis, and use this as a platform to further produce liquid fuels and a series of high value-added basic platform compounds through chemical conversion or biocatalysis, such as fuel ethanol , 5-hydroxymethylfurfural, levulinic acid, polyols, etc. Therefore, the conversion from cellulose to sugar is the key link in our exploitation of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/02C13K5/00C13K7/00C13K11/00B01J27/02
CPCC13K1/02C13K5/00C13K7/00C13K11/00B01J27/02
Inventor 陆佳刘伟王欣周闯苏小红范超王玉鹏秦国辉孙丽
Owner ENERGY & ENVIRONMENT RES INST OF HEILONGJIANG PROVINCE
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