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Method for preparing water-soluble lignin

A technology of water-soluble lignin and lignocellulose, applied in the field of renewable resources, can solve the problems of limited application, poor solubility, low economic benefits, etc.

Inactive Publication Date: 2018-11-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although sulfonate lignin is widely and maturely used in industry, its general efficiency is not high, and its economic benefits are low, and its deeper utilization is limited due to the sulfur element contained in its molecule.
Although alkali lignin has a good solubility in alkaline solution, its solubility in acid or neutral is poor, which greatly limits its industrial application.

Method used

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  • Method for preparing water-soluble lignin
  • Method for preparing water-soluble lignin

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preparation example Construction

[0018] In view of the extensiveness of lignocellulose resources and the current situation that the water solubility of lignin limits its application, the application provides a method for preparing water-soluble lignin, including:

[0019] React lignocellulose powder with ethylenediamine in a closed container, dry and then wash and extract with water to obtain water-soluble lignin;

[0020] The ratio of the lignocellulose powder to the ethylenediamine is 1g:(0.4-1)ml; the reaction temperature is 50-180°C, and the reaction time is 0.5-4h.

[0021] This application uses ethylenediamine to treat lignin in lignocellulose, the connection between the treated lignin and hemicellulose is broken, and a certain amount of amino groups are introduced at the same time, so the treated lignin is acid-soluble and water-soluble Sexual enhancement.

[0022] Specifically, the lignocellulose is not particularly limited in this application, and may be lignocellulose well known to those skilled in...

Embodiment 1

[0032] Take 1.0g of straw powder, add 0.6ml of ethylenediamine, react at 120°C for 1h, dry at 60°C, wash once with 50ml of water and then dry. Measure the volume of washing liquid and the concentration of soluble lignin as shown in Table 1.

[0033] The concentration data table of the water-soluble lignin prepared in the present embodiment of table 1

[0034] frequency

[0035] The present invention detects that the soluble lignin content in the washing liquid is 0.126g, and the final lignin conversion rate is 62.9%.

Embodiment 2

[0037] Take 1.0g of straw powder, add 1.0ml of ethylenediamine, react at 100°C for 0.5h, dry at 105°C, wash with 15ml of water three times and then dry, measure the volume of washing liquid and the concentration of water-soluble lignin as shown in Table 2 Show,

[0038] The concentration data sheet of the water-soluble lignin prepared in the present embodiment of table 2

[0039] frequency

[0040] The present invention detects that the soluble lignin content in the washing liquid is 0.106g, and the final lignin conversion rate is 53.1%.

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Abstract

The invention provides a method for preparing water-soluble lignin. The method comprises the following steps: reacting lignocellulose powder with ethylenediamine in a closed reactor; drying, washing with water, and extracting to obtain water-soluble lignin, wherein the ratio of the lignocellulose to ethylenediamine is 1g to (0.4-1)ml, the reacting temperature is 50-180 DEG C, and the reacting timeis 0.5-4 hours. According to the method, the lignocellulose is treated with ethylenediamine by utilizing the specific raw material proportion, reacting temperature and reacting time, and the water-soluble lignin is obtained.

Description

technical field [0001] The invention relates to the technical field of renewable resources, in particular to a method for preparing water-soluble lignin. Background technique [0002] As a large agricultural country, China produces up to 700 million tons of agricultural and forestry waste every year, most of which are agricultural straw, which contains a large amount of lignocellulose resources. With the improvement of comprehensive agricultural productivity, the total output of crop straw in China will also show a growing trend in general. However, the current use of agricultural straw in my country is mainly returning to the field, burning or making fertilizer and feed. The overall economic benefits of these treatment methods are not high, and sometimes cause serious environmental pollution. Therefore, lignocellulose needs to be pretreated to effectively utilize lignocellulose and reduce environmental pollution. [0003] At present, the relatively mature research techno...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 元英进李文超李炳志徐涛朱家庆
Owner TIANJIN UNIV
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