Method for high-efficiency hydrolyzing lignocellulose raw material in ionic liquid

A lignocellulosic raw material and ionic liquid technology, which is applied in fiber raw material processing, textile and papermaking, and bulk chemical production, can solve the problems of hydrolysis of lignocellulosic raw materials, cumbersome hydrolysis steps, and large amount of acid, etc., and achieve Low requirements for corrosion resistance, low cost, and few by-products

Active Publication Date: 2008-12-31
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

But there are also a series of defects: cumbersome hydrolysis steps, large amount of acid, serious pollution
H

Method used

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  • Method for high-efficiency hydrolyzing lignocellulose raw material in ionic liquid
  • Method for high-efficiency hydrolyzing lignocellulose raw material in ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Add 4 g of ionic liquid BMImCl into a 10 ml round bottom flask, heat to 100°C, slowly add 0.2 g of 40 mesh corn stalks under vigorous stirring, and stir until all soluble parts are completely dissolved. At this point, 0.03 g of water and 0.04 g of concentrated hydrochloric acid (36 wt%) were quickly added to the reaction system in sequence, and reacted at 100° C. for 30 minutes under normal pressure. After the reaction is finished, quench the reaction with cold water, adjust the pH value of the reaction solution to 7.0 with 0.5 mol / L NaOH, and measure the reducing sugar content of the obtained hydrolyzate by DNS method. The resulting reducing sugar yield and hydrolysis efficiency were 66% and 43%, respectively.

Embodiment 2～3

[0030] Other process conditions and experimental steps are the same as in Example 1, but using concentrated hydrochloric acid (36wt%) of different qualities as a catalyst, and quenching the reaction at different times, the results are shown in Table 1. The experimental results show that the increase of acid amount can accelerate the hydrolysis rate.

[0031] Table 1 Hydrolysis reaction results of corn stalks catalyzed by different qualities of hydrochloric acid

[0032] project

Embodiment 4～5

[0034] Other process conditions and experimental steps are the same as in Example 1, but the quality of water added is 0.1 gram and 0.2 gram respectively. The hydrolysis reaction was terminated at different times, and the results are shown in Table 2. The experimental results show that the increase of the amount of water as a reactant can lead to a significant decrease in the reaction rate, but the yield of reducing sugar is increased. This is because the increase in the amount of water in the reaction system leads to a decrease in acid concentration and milder reaction conditions, which slow down the degradation of reducing sugars.

[0035] Influence law of water content on hydrolysis result in table 2 reaction system

[0036] project

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Abstract

The invention relates to a method for hydrolyzing lignocellulose materials, in particular to a method for efficiently hydrolyzing the lignocellulosic materials in ionic liquid; and the ionic liquid is taken as a solvent, greater than or equal to 1mol equivalent of water serves as a reactant, and an inorganic acid or an organic acid from catalytic amount to chemometry is taken as a catalyst, the lignocellulose materials such as crop straws, pine powder are reacted under ordinary pressure and at a temperature of not above 100 DEG C for 2 minutes to 34 hours; after the reaction is finished, a hydrolysate is obtained by quenching action with cold water and neutralization with alkali, generating immediately; and the quantitative chemical analysis is conducted to the total reducing sugar in the hydrolysate, indicating that the yield of the reducing sugar can reach 81 percent maximally and the hydrolysis efficiency can reach 58 percent. Compared with the traditional method of hydrolysis, the method has advantaged of non pretreatment process, low acid consumption, mild reaction condition, high hydrolytic activity, fast reaction speed, low corrosion resistance requirements for a reactor, high yield of reducing sugar, and easy tracking of extent of reaction. The method opens a new way for solving the problem of full utilization of lignocellulose existing for a long time.

Description

technical field [0001] The invention relates to the hydrolysis of lignocellulose, specifically a method for efficiently hydrolyzing lignocellulosic raw materials in an ionic liquid, using an ionic liquid with good solubility for cellulose as a solvent, in the catalysis of an inorganic acid or an organic acid A method for simultaneously and efficiently hydrolyzing cellulose and hemicellulose to obtain soluble sugars. Background technique [0002] Lignocellulose resources exist in large quantities in nature, and are the most abundant and cheapest renewable resources that meet the requirements of sustainable development on the earth. If all the cellulose materials formed by photosynthesis on the earth are effectively used every year, the energy produced will far exceed the energy consumed by the whole world every year. However, so far, the utilization efficiency of human beings is very low, and the total amount of biomass produced in the world is about 2.9×10 21 joules of ene...

Claims

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Application Information

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IPC IPC(8): D21C5/00C08B1/00
CPCY02P20/54
Inventor 赵宗保李昌志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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