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Lignin sand-fixation agent

A sand-fixing agent and lignin technology, applied in the directions of organic fertilizers, fertilizer mixtures, chemical instruments and methods, etc., can solve the problems of forest vegetation reduction, threats to sustainable social development, desertification and other issues

Inactive Publication Date: 2003-10-01
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, today's world is still facing the ecological problems of decreasing forest vegetation, desertification and desertification, which pose a serious threat to the sustainable development of society.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] a. evaporating and concentrating the cooking waste liquid (also called black liquor) proposed in the pulping of wheat straw (or other plant fiber raw materials) by the alkaline method (caustic soda method, kraft method) to obtain a raw material liquid with a solid content ≥ 8%;

[0009] b. Add formaldehyde (or acetaldehyde) to the raw material liquid, and control the molar mass ratio of formaldehyde (or acetaldehyde) to lignin to be 0.5-2.5;

[0010] c. React for 1-10 hours at a temperature of 50-160°C until the formaldehyde is completely reacted;

[0011] d. add urea in the reactant, control the molar mass ratio of formaldehyde (or acetaldehyde) and urea to be 2.0~10.0;

[0012] e. Reacting for 1 to 10 hours at a temperature of 50 to 160°C and adding 0.05 to 1.0% of hexamethylenetetramine or borax or alcohols as a crosslinking agent;

[0013] f. Concentrate and spray dry the reactants by evaporation

[0014] You can get dark or light brown powdery lignin sand-fixing ...

Embodiment 2

[0016] a. Evaporating and concentrating the cooking waste liquid (also known as red liquid) from wood (or other grass plant fiber raw materials) sulfite method (acidic, neutral and alkaline) pulping to obtain a solid content of ≥8 % raw material liquid;

[0017] b. Add formaldehyde (or acetaldehyde) to the raw material liquid, and control the molar mass ratio of formaldehyde (or acetaldehyde) to lignin to be 0.5-2.5;

[0018] c. reacting at a temperature of 70-120°C for 1-5 hours until the aldehydes are completely reacted;

[0019] d. add urea in the reactant, control the molar mass ratio of formaldehyde (or acetaldehyde) and urea to be 2.0~10.0;

[0020] e. Reacting for 1 to 5 hours at a temperature of 70 to 120°C and adding 0.05 to 1.0% of hexamethylenetetramine or borax or alcohols as a crosslinking agent;

[0021] f. Concentrate and spray dry the reactants by evaporation

[0022] A light brown powdery lignin sand-fixing agent product can be obtained.

[0023] The main ...

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PUM

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Abstract

A sand-fixation lignin chemical is prepared from the waste digestion liquid generated in chemical pulping step through reaction on aldehyde compound, adding less cross-linking agent and condensating reaction on urea. It is applied by spraying it on ground surface for preserving water, improving soil and increasing the survival rate of vegetation.

Description

1. Technical field [0001] The invention belongs to the technical field of papermaking pulping and cooking waste liquid treatment and utilization in the chemical industry. 2. Background technology [0002] When using wood, wheat straw, straw, reed, bagasse, bamboo, miscanthus and other plant fiber raw materials to make paper, no matter what chemical pulping method is used, a large amount of cooking waste liquid will be produced. In these cooking effluents, there are inorganic chemicals and a large amount of lignin and sugar compounds separated from the raw materials. In order to reduce production costs and reduce environmental pollution, pulping companies must use special processes and equipment to deal with these waste cooking liquids. Inorganic chemicals extracted from waste liquid can be recycled, and how to use the large amount of lignin and sugar produced more reasonably and effectively has always been a research topic in the modern pulp and paper industry. [0003] On...

Claims

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Application Information

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IPC IPC(8): C09K17/32
Inventor 李忠正
Owner NANJING FORESTRY UNIV
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