Method for preparing modified kraft pulp sodium lignosulphonate

A technology of sodium lignosulfonate and kraft pulp, which is applied in the directions of lignin derivatives, chemical instruments and methods, organic chemistry, etc., can solve the problems of unstable quality, large molecular weight distribution range of lignin, poor thermal stability, etc. Achieve the effect of process science, high economic value and environmental protection advantages, and easy operation

Active Publication Date: 2009-06-03
ZHEJIANG JIEFA TECH
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Problems solved by technology

[0005] The present invention mainly solves the technical problems of unstable quality caused by excessive lignin molecular weight distribution range and poor heat resistance stability in the prior art.

Method used

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  • Method for preparing modified kraft pulp sodium lignosulphonate
  • Method for preparing modified kraft pulp sodium lignosulphonate
  • Method for preparing modified kraft pulp sodium lignosulphonate

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Embodiment 1

[0028] A preparation method of modified kraft pulp sodium lignosulfonate, comprising the following specific steps:

[0029] a: Acid analysis: Introduce purified CO rich in kraft pulp black liquor at 70°C to 80°C 2 After 8 hours of exhaust gas from the flue, macromolecular-level crude lignin can be obtained;

[0030] b: Desalting: washing the macromolecular grade crude lignin obtained in step a with hot water to remove inorganic salts in the crude lignin to obtain macromolecular grade refined lignin.

[0031] c: Sulfonation condensation reaction: Dissolve refined lignin in 40% sodium hydroxide lye, and then add sodium sulfite at a weight ratio of 1:1.0 between refined lignin and sodium sulfite at a temperature of 170°C. React for 8 hours, then add formaldehyde and continue to react for 10 hours to obtain a modified kraft pulp sodium lignosulfonate solution; the weight ratio of the amount of formaldehyde to refined lignin is 0.5:1.

[0032] d: Removal of tall oil: the modified...

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Abstract

The invention relates to a method for preparing modified kraft pulp sodium lignosulphonate. Craft pulp black liquor in paper mill is used as raw material, and CO2 enriched in flue exhaust gas is used as an acid-extracting agent to obtain macromolecular raw lignin by acid extraction. Then the raw lignin is washed in water for removing salt to obtain refined lignin. Finally, the refined lignin is made into the modified kraft pulp sodium lignosulphonate by sulphonation condensation reaction. The preparation method has the characteristics of scientific technology, simple operation, etc. The thermal stability of a product is more than 150 DEG C; the content of inorganic salt is not more than 2 percent; and side product talloel does not exist. In addition, the raw material is the waste liquor of the paper mill, the flue exhaust gas has series pollution and damage effect towards the environment, and the technical proposal produces the macromolecular modified kraft pulp sodium lignosulphonate by the process modification of harmful and exhaust liquor and exhaust gas, so that the invention has high economic value and environmental protection value.

Description

(1) Technical field [0001] The invention relates to a preparation method of modified kraft pulp lignosulfonate sodium. (2) Background technology [0002] The main component of the lignin dispersant is sodium lignosulfonate, which is formed by introducing a sulfonic acid group on the α-carbon atom of the lignin molecule. Its structural formula is as follows: [0003] [0004] The raw material is pulp waste liquor from the paper industry, and acid lignin and alkali lignin are obtained due to different pulping methods. The former is obtained from sulfite waste liquor, and the latter is obtained from kraft pulp black liquor. . At present, there are researches on these two kinds of lignin at home and abroad, and there are already products. Domestic acid lignin dispersants such as M-9 represented by Kaishantun, because of a large amount of reducing sugar and inorganic salts, make the product have extremely poor heat resistance stability, only about 110 ° C ~ 130 ° C, can only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G1/00C08H7/00
Inventor 邵国标
Owner ZHEJIANG JIEFA TECH
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