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Dissolution method of lignocellulose

A technology of lignocellulose and solution, which is applied in the field of lignocellulose processing and application, to achieve the effects of increasing accessibility, improving dissolution efficiency, and reducing costs

Active Publication Date: 2016-03-23
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, NMMO is only used to dissolve pure cellulose, and it is relatively seldom used to dissolve lignocellulose containing lignin.

Method used

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  • Dissolution method of lignocellulose
  • Dissolution method of lignocellulose
  • Dissolution method of lignocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 20 g of dry poplar bleached pulp to 160 g of glycerol, place it in an oil bath at 120°C for 2 hours, and transfer it to a screw press for extrusion and swelling. The obtained sample is ready for use;

[0031] Take 3.34g of the sample containing glycerol in the impregnating solution (glycerol content is 90.01%), add it to 30g of N-methylmorpholine-N-oxide monohydrate solution, place it in a water bath at 85°C and stir it mechanically for 1 hour at a speed of 400r / min, a lignocellulose solution with a concentration of 1% can be obtained. In the obtained lignocellulose solution, the lignocellulose content is 1%, the glycerol content is 9.02%, the N-methylmorpholine-N-oxide content is 78.01%, and the rest is water.

[0032] Take 10 g of the sample containing the impregnating solution and use centrifugal washing method to wash away the glycerol contained in the sample, and dry it for later use.

[0033] Take 0.30g of an absolute dry sample that does not contain glycerol...

Embodiment 2

[0035] Add 20 g of absolute dry poplar pulp with a lignin content of 3.03% to 160 g of glycerol, place it in an oil bath at 120° C. for mechanical stirring for 2 hours, transport it to a screw press for extrusion and swelling, and obtain a sample for later use;

[0036]Take 4.30 g of the sample containing glycerol in the impregnating solution (glycerol content is 92.00%), add it to 30 g of N-methylmorpholine-N-oxide monohydrate solution, place it in a water bath at 85° C. and stir it mechanically for 2 hours at a speed of 400r / min, a lignocellulose solution with a concentration of 1% can be obtained. In the obtained lignocellulose solution, the lignocellulose content is 1%, the glycerol content is 11.53%, the N-methylmorpholine-N-oxide content is 75.83%, and the rest is water.

[0037] Take 10 g of the sample containing the impregnating solution and use centrifugal washing method to wash away the glycerol contained in the sample, and dry it for later use.

[0038] Take 0.30 g...

Embodiment 3

[0040] 20g of dry poplar pulp with a lignin content of 6.89% was added to 160g of glycerol, placed in a 120°C oil bath for mechanical stirring for 2 hours, and then transported to a screw press for extrusion and swelling, and the obtained sample was set aside;

[0041] Take 3.25g of the sample containing glycerol in the impregnating liquid (glycerol content is 89.78%), add it to 30g of N-methylmorpholine-N-oxide monohydrate solution, place it in a water bath at 85°C and stir it mechanically for 3 hours at a speed of 400r / min, a lignocellulose solution with a concentration of 1% can be obtained. In the obtained lignocellulose solution, the lignocellulose content is 1%, the glycerol content is 8.78%, the N-methylmorpholine-N-oxide content is 78.23%, and the rest is water.

[0042] Take 1 g of the sample containing the impregnation solution and use centrifugal washing to wash away the glycerol contained in the sample, and dry it for later use.

[0043] Take 0.30g of an absolute ...

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Abstract

The invention relates to a dissolution method of lignocellulose with different lignin contents, belongs to the fields of lignocellulose processing and application and aims at providing a lignocellulose dissolution process which is simple, convenient and low in production cost. The method comprises the steps of adding the dried lignocellulose to a polyalcohol solution, conducting heating and stirring for 2-3 hours, then conducting mechanical pretreatment, obtaining a sample containing glycerine or a dry sample from which glycerine is washed away, mixing the sample with an N-methylmorpholine-N-oxide-hydration solution, conducting stirring and dissolution at the temperature of 85 DEG C, and obtaining a lignocellulose solution. The stable and homogeneous lignocellulose solution can be obtained no matter whether the glycerine is contained in a finished product obtained through dissolution or not. According to the dissolution method of the lignocellulose, through process improvement, N-methylmorpholine-oxide which only dissolves pure cellulose is applied to dissolution of a lignocellulose raw material containing lignin, and the scope of traditional pure cellulose dissolution is broken through. By means of the dissolution method, activation pretreatment is conducted on the lignocellulose, the crystal form of the lignocellulose raw material is not destroyed, meanwhile, production cost is lowered, and the process method is simplified.

Description

technical field [0001] The invention belongs to the field of lignocellulose processing and application, and mainly relates to a method for dissolving lignocellulose. Background technique [0002] Lignocellulosic biomass in nature, such as wood and grass, is composed of about 50% cellulose, 25% hemicellulose and 20% lignin, and is an extremely abundant renewable resource on the earth. Lignocellulose is widely used in textiles, papermaking, medicine, environmental protection, building materials and petrochemical industries. The production of biomass energy from lignocellulose through dissolution, fractionation, saccharification, fermentation and other processes and the preparation of biomass materials through dissolution, separation, regeneration and other processes have become research hotspots in recent years. Since natural wood and grass only contain 50% cellulose, artificial separation of cellulose is not only complicated but also expensive, so it is difficult to achieve ...

Claims

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Application Information

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IPC IPC(8): C08J3/11C08L1/02C08L5/14C08L97/00
CPCC08J3/11C08J2301/02C08L1/02C08L5/14C08L97/005
Inventor 王志国张莉莉周小凡陆海龙徐军飞范一民
Owner NANJING FORESTRY UNIV
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