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Method for catalytically decomposing wood fiber raw material

A technology for lignocellulosic raw materials and catalytic decomposition, which is used in fiber raw material processing, raw material separation, textile and papermaking, etc., can solve the problems of difficult by-product processing, large environmental pollution, and single product structure, and achieves lower separation costs and pollution. , the effect of improving the extraction rate

Pending Publication Date: 2019-06-28
GUANGZHOU YINNOVATOR BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional method uses water to cook lignocellulosic raw materials, and the obtained product is generally cellulose, which has the disadvantages of single product structure, difficult by-product treatment, and large environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Mix acetic acid and lignocellulosic raw materials according to the mass ratio of 20:1, and then pretreat at 120°C for 0.5h; after pretreatment, add SO 4 2- / Fe 2 o 3 Solid acid catalyst, added in an amount of 1 wt% of the lignocellulosic raw material, cooking at 130°C for 2 hours, and filtering after cooking;

[0045] (2) Use acetic acid and water to alternately wash the solid-phase mixture obtained in step (1) for 6 times, sieve the cleaned mixture, select a combination of sieves with multiple apertures to sieve, so that the solid acid catalyst is retained in the The sieve with a pore size of 3mm realizes the separation of cellulose and solid acid catalyst; the separated solid acid catalyst is washed with distilled water, dried and recovered at 100°C, and reused;

[0046] (3) Evaporating and concentrating the cooking liquid obtained from the separation in step (1), the concentration temperature is 90°C, under negative pressure, the concentration ratio is 8 times...

Embodiment 2

[0049] (1) Mix ethanol and lignocellulosic raw material according to the mass ratio of 25:1, then pretreat at 105°C for 3 hours; after pretreatment, add solid acid catalyst B to the resulting mixture 2 o 3 / ZrO 2 , the addition amount is 0.2wt% of the lignocellulosic raw material, then cooking at 110°C for 5h, and filtering after cooking;

[0050] (2) Use steam at 120°C to treat the solid-phase mixture separated in step (1) for 20 minutes, then wash it with water for 8 times, sieve the cleaned mixture, and select a combination of sieves with various apertures for sieving to make the solid The acid catalyst is trapped on the sieve with a pore size of 5mm, which realizes the separation of cellulose and solid acid catalyst; the separated solid acid catalyst is washed with distilled water, dried and recovered at 80°C, and reused;

[0051] (3) Evaporating and concentrating the cooking liquid separated in step (1), the concentration temperature is 100°C, and the concentration is 1...

Embodiment 3

[0054] (1) According to the mass ratio of 30:1, ethyl acetate is mixed with lignocellulosic raw materials, and then pretreated at 120°C for 2.5h; after the pretreatment is completed, ZSM-5 zeolite solid acid catalyst is added to the resulting mixture , the addition amount is 4wt% of the lignocellulosic raw material, cooking at 140°C for 3 hours, and filtering after cooking;

[0055] (2) Use ethyl acetate and water to alternately wash the solid phase mixture obtained in step (1) for 10 times, sieve the cleaned mixture, select a combination of screens with various apertures to sieve, and make the solid acid catalyst Retained on a screen with a pore size of 8mm, the separation of cellulose and solid acid catalyst is realized; the separated solid acid catalyst is washed with distilled water, dried and recovered at 120°C, and reused;

[0056] (3) Evaporating and concentrating the cooking liquid obtained in step (1), the concentration temperature is 120°C, and the concentration is 1...

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Abstract

The invention relates to a method for catalytically decomposing a wood fiber raw material. The method comprises the following steps: preprocessing the wood fiber raw material by virtue of an organic solvent, after the preprocessing is finished, adding a solid acid catalyst, cooking, and carrying out solid-liquid separation; washing a separated solid-phase mixture, and sieving, so as to obtain cellulose and the solid acid catalyst; and concentrating separated cooking liquid, and recycling the organic solvent, so as to obtain a mixture of sugar and lignin. According to the method, the organic solvent is taken as a solution for separating the wood fiber raw material and is combined with the solid acid catalyst for catalytic reaction, and three products including sugar liquid, lignin and cellulose are obtained through controlling the process conditions, so that the efficient extraction of valuable components in the wood fiber raw material is realized, and the recycling rate of the valuablecomponents can reach over 92%. Meanwhile, the corrosion resistance requirement of the separation equipment is reduced, and the solid acid catalyst and the organic solvent can be repeatedly used, so that the production cost is lowered, the environmental pollution is reduced, and the method has good application prospects.

Description

technical field [0001] The invention relates to the field of decomposition and recovery of biological raw materials, in particular to a method for catalytically decomposing lignocellulosic raw materials. Background technique [0002] Lignocellulosic raw materials mainly contain cellulose, hemicellulose, and lignin. In the separation of traditional lignocellulosic raw materials, the product is single, and the product is usually cellulose. Other components of lignocellulosic raw materials are often regarded as by-products. It is difficult to recycle and the economic benefit is not high. [0003] In the separation of lignocellulosic raw materials in traditional industries, inorganic acids such as hydrochloric acid and sulfuric acid are mostly used as catalysts, so the separation liquid often contains liquid strong acids. Since the separation liquid contains liquid strong acid, it is easy to corrode the cooking equipment, which increases the anti-corrosion requirements of the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08B37/14D21C5/00
CPCC08B37/00C08B37/14D21B1/30D21C3/20D21C5/00
Inventor 张睿哲刘运思闵渝陈文健
Owner GUANGZHOU YINNOVATOR BIOTECH CO LTD
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