Method for purifying industrial lignin

A technology of industrial lignin and purification method, which is applied in the field of industrial lignin purification, and can solve problems such as high cost, ineffective removal of solubility, complicated operation, etc.

Inactive Publication Date: 2010-09-29
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current industrial lignin purification method mainly uses benzene-ethanol mixture to extract hemicellulose and oligosaccharides. Sugar, inorganic substances, etc. cannot be effectively removed, and a large amount of organic solvents are used, which is costly and complicated to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for purifying industrial lignin, comprising the following steps:

[0017] In the first step, silica gel of 80-100 mesh is selected, and the silica gel is weighed and filled in a chromatographic column according to the mass ratio of silica gel and industrial lignin sample to be purified as 1:100, and the silica gel is an industrial-grade or above product;

[0018] In the second step, the industrial lignin to be purified is dissolved in 5 times of water to make an industrial lignin solution, and the industrial lignin is a lignin product extracted from the waste liquid of the pulp and paper industry;

[0019] The third step is to pour the industrial lignin solution evenly on the top layer of silica gel in the chromatographic column filled in the first step. After the industrial lignin solution completely penetrates into the silica gel, put a layer of silica gel on the top of the silica gel and add deionized water. For elution, the elution solution is received sepa...

Embodiment 2

[0023] A method for purifying industrial lignin, comprising the following steps:

[0024] In the first step, silica gel of 100-200 mesh is selected, and the silica gel is weighed and filled in a chromatographic column according to the mass ratio of silica gel and industrial lignin sample to be purified as 1:80, and the silica gel is an industrial grade or above product;

[0025] In the second step, the industrial lignin to be purified is dissolved in 5 times of water to make an industrial lignin solution, and the industrial lignin is a lignin product extracted from the waste liquid of the pulp and paper industry;

[0026] The third step is to pour the industrial lignin solution evenly on the top layer of silica gel in the chromatographic column filled in the first step. After the industrial lignin solution completely penetrates into the silica gel, put a layer of silica gel on the top of the silica gel and add deionized water. For elution, the elution solution is received sepa...

Embodiment 3

[0030] A method for purifying industrial lignin, comprising the following steps:

[0031] In the first step, silica gel of 100-200 mesh is selected, and the silica gel is weighed and filled in a chromatographic column according to the mass ratio of silica gel and industrial lignin sample to be purified as 1:80, and the silica gel is an industrial grade or above product;

[0032] In the second step, the industrial lignin to be purified is dissolved in 5 times of water to make an industrial lignin solution, and the industrial lignin is a lignin product extracted from the waste liquid of the pulp and paper industry;

[0033] The third step is to pour the industrial lignin solution evenly on the top layer of silica gel in the chromatographic column filled in the first step. After the industrial lignin solution completely penetrates into the silica gel, put a layer of silica gel on the top of the silica gel and add deionized water. For elution, the elution solution is received sepa...

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PUM

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Abstract

The invention relates to a method for purifying industrial lignin, comprising the following steps: weighting and filling silica gel in a chromatography column; dissolving the industrial lignin to be purified in water; spraying the solution of the industrial lignin onto the top layer of the silica gel in the chromatography column; placing a layer of silica gel on the top of the silica gel after the solution of the industrial lignin is soaked in the silica gel; adding deionized water to elute; holding brown eluting solution in a second container and holding light-colored part of the eluting solution in a first container according to the color distribution; adding acid solution to a silica gel column, and eluting the silica gel in the silica gel column unit the silica gel turning white; holding eluting acid solution in a third container; drying the brown eluting solution in the second container by distillation to obtain the purified industrial lignin product; drying the light-colored part of the eluting solution in the first container by distillation to obtain inorganic salt; and drying the eluting acid solution in the third container by distillation to obtain hemicellulose and oligosaccharide. The method for purifying industrial lignin has the advantages of low cost and less pollution and can be used in the field of the purification of the industrial lignin.

Description

technical field [0001] The invention relates to the technical field of purification of lignin products, in particular to a method for purification of industrial lignin. Background technique [0002] Lignin is a natural polymer product second only to cellulose in production. It is estimated that 150 billion tons of lignin can be produced by plant growth in the world every year. The main source of industrial lignin is the by-products of papermaking - alkali lignin and lignosulfonate, but the utilization rate of this by-product is very low at present, and some enterprises use it directly as fuel, resulting in a great waste of resources. Alkali lignin and lignosulfonate have hydrophilic groups such as phenolic hydroxyl group, sulfonic acid group, carboxyl group and hydrophobic groups such as benzene ring, methoxyl group, propyl group, etc., and have certain surface activity, so industrial lignin is It is a very potential green chemical raw material, and it has been used in surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G1/00
Inventor 陈刚汤颖张洁
Owner XI'AN PETROLEUM UNIVERSITY
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