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Lignocellulosic feedstock pretreatment method without prepreg

A lignocellulose and pretreatment technology, which is applied in the directions of biofuel, waste fuel, fermentation, etc., can solve the problems of increasing the operation complexity of the pretreatment process, the fixed investment cost, and the increase of the pretreatment processing cost of lignocellulose raw materials. The effect of simplifying operational complexity, reducing time, and reducing costs

Inactive Publication Date: 2015-07-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the long-term presoaking operation greatly increases the operational complexity and fixed investment cost of the pretreatment process, thereby greatly increasing the pretreatment processing cost of lignocellulosic raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1400g of dry straw after dedusting and crushing and 700g of dilute sulfuric acid solution of 5% mass fraction were placed in a plastic box, and fully mixed evenly, and then pre-soaked at room temperature for 30 minutes. Put the uniformly mixed dilute acid and straw into the pretreatment reactor equipped with a ribbon-type stirring paddle for high-temperature pretreatment reaction. The reaction conditions are 185 ° C, the stirring speed is 50 rpm, and the temperature rises to 185 ° C. After that, keep it for 3 minutes. Take out the material from the reactor and carry out the enzymatic hydrolysis test. The solid content of the enzymatic hydrolysis test is 5%, the temperature is 50°C, the stirring speed is 150 rpm, the amount of cellulase is 15FPU / g DM, the glucose concentration is measured after 72 hours, and the cellulose is calculated. Conversion rate, the conversion rate of cellulose under this condition is 82%.

Embodiment 2

[0024] Put 1400g of dry straw after dedusting and crushing and 700g of dilute sulfuric acid solution with 5% mass fraction in a plastic box, and fully mix them evenly, and pre-soak at room temperature for 12 hours after mixing. Add the uniformly mixed dilute acid and straw into the pretreatment reactor equipped with a ribbon-type stirring paddle for high-temperature pretreatment reaction. The reaction conditions are 185°C, the stirring speed is 50 rpm, and the temperature rises to 185°C and then reserved for 3 minutes. , take out the material from the reactor, and carry out the enzymatic hydrolysis test, the solid content of the enzymatic hydrolysis test is 5%, the temperature is 50 ° C, the stirring speed is 150 rpm, the amount of cellulase is 15 FPU / g DM, the glucose concentration is measured after 72 hours, and the fiber is calculated. The conversion rate of cellulose was 87% under this condition.

Embodiment 3

[0026] Put 1400g of dry straw after dedusting and crushing and 700g of dilute sulfuric acid solution with 5% mass fraction in a plastic box, and fully mix them evenly, and pre-soak at room temperature for 24 hours after mixing. Put the uniformly mixed dilute acid and straw into the pretreatment reactor equipped with a ribbon-type stirring paddle, and the stirring speed is 50 rpm, and carry out high-temperature pretreatment reaction. , take out the material from the reactor, and carry out the enzymatic hydrolysis test, the solid content of the enzymatic hydrolysis test is 5%, the temperature is 50 ° C, the stirring speed is 150 rpm, the amount of cellulase is 15 FPU / g DM, the glucose concentration is measured after 72 hours, and the fiber is calculated. The conversion rate of cellulose was 84% ​​under this condition.

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Abstract

The present invention relates to a lignocellulosic feedstock pretreatment method without prepreg. The method comprises the specific steps of: (1) pretreating the lignocellulosic feedstock by dedusting and crushing; (2) preparing acid, alkali and salt solution or an organic solvent; (3) adding the materials obtained in the step (1) and the ) chemical solution or solvent obtained in step (2) into a pretreatment reactor for pretreatment; and (4) conducting subsequent processing steps such as enzymatic hydrolysis or simultaneous saccharification and fermentation on the pretreated lignocellulosic feedstock obtained in the step (3). The invention has the advantage that the pretreatment without prepreg, in the premise of ensuring the pretreatment effect, simplifies the operation complexity of the pretreatment process, greatly shortens the time for pretreatment and improves the operational efficiency of pretreatment; at the same time, the method save the invest for fixed equipment such as prepreg reactor, and dramatically reduces the cost of lignocellulose pretreatment and final biorefinery production process of bio-based chemicals.

Description

【Technical field】 [0001] The invention relates to the technical field of lignocellulose raw material treatment, in particular to a lignocellulose raw material pretreatment method without pre-soaking. 【Background technique】 [0002] The main process of lignocellulose bioprocessing to produce liquid biofuels or bio-based chemicals includes lignocellulose pretreatment, pretreatment, enzymatic saccharification, fermentation production, and product separation. The pretreatment process refers to destroying the structure of lignocellulose by physical, chemical, physicochemical or biological methods, so as to effectively improve the conversion efficiency of cellulose and hemicellulose in lignocellulose in the subsequent saccharification and fermentation process. Therefore, the pretreatment process is one of the most critical technologies for the production of chemicals in lignocellulosic biorefinery. [0003] Dilute acid pretreatment is one of the most mainstream pretreatment metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02C12P7/10C12P5/02
CPCY02E50/10Y02E50/30
Inventor 鲍杰何燕青张建
Owner EAST CHINA UNIV OF SCI & TECH
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