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Method for producing sulfonated lignin

The technology of lignosulfonate and normal pressure is applied in the field of lignosulfonate production from black liquor, which can solve the problems of low price, high cost and high operating cost, and achieve high surface activity, dispersion performance and high dispersion stability. Good, good grinding effect

Inactive Publication Date: 2003-08-06
邓州市老廷实业有限公司
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  • Abstract
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Problems solved by technology

The alkali recovery method has problems such as large investment, high cost, high operating cost, and incomplete sewage treatment.
Alkali lignin produced by drying into powder is not only cheap, but also has a single sales market

Method used

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Embodiment Construction

[0015] Taking the production of sodium lignosulfonate as an example below, the production method at normal temperature and pressure of the present invention is illustrated, comprising the steps:

[0016] ①The raw pulp from the steamed ball is extracted from the black liquor through three times of extrusion equipment.

[0017] ② Send the black liquor into a four-body three-effect evaporator for evaporation and concentration; make its concentration reach 32-37%, preferably 35%;

[0018] 3. Carry out sulfonation reaction at normal temperature and pressure, at first add formaldehyde, wherein the amount of adding formaldehyde accounts for 4~6% of black liquor solid weight, is preferably 5%, heats 55~65 ℃, reacts 80~100 minutes;

[0019] 4. Then add sodium sulfite or calcium sulfite, wherein the amount of sodium sulfite or calcium sulfite added accounts for 14-16% of the black liquor round weight, preferably 15%, heating at 95-100°C, and reacting for 80-100 minutes.

[0020] ⑤Send ...

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Abstract

The method for producing sulfonated lignin from black liquor in straw pulp paper making process includes the following steps: taking black liquor from virgin pulp of rotary spherical digester, feeding the black liquor into evaporator to make evaporation and concentration; then make sulfonation reaction at normal temp. and normal pressure, firstly, adding formaldehyde, then adding sulfite and heating to more reaction, feeding the above-mentioned material into drying tower, drying to obtain the powder. Said product contains lots of active gene of sulfonic group and hydroxyl group, so that it has good solubility, high surface activity and dispersion property, mainly is used in disperse dyes, reduction dyes and dispersion and filling of water coal slurry.

Description

technical field [0001] The invention relates to a method for producing lignosulfonate, in particular to a method for producing lignosulfonate from straw pulp papermaking black liquor at normal temperature and pressure. Background technique [0002] Alkali pulping black liquor treatment, one is alkali recovery method, and the other is drying into powder method to produce alkali lignin. The alkali recovery method has problems such as large investment, high cost, high operating cost, and incomplete sewage treatment. Alkali lignin produced by drying into powder is not only cheap, but also has a single sales market. In the chemical industry, the general sulfonation reaction is carried out under high temperature and high pressure. Its reaction conditions are relatively high, and the reaction vessel must be able to withstand a certain reaction pressure. Generally, the internal pressure of the pressure cooker is 2.5kg / cm 2 , the outer pot pressure is 6.0kg / cm 2 , to ensure that t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 马廷云全国林马冠
Owner 邓州市老廷实业有限公司
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