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Method for preparing reduced dye dispersant from papermaking black liquid

A dye dispersant and papermaking black liquor technology, applied in chemical instruments and methods, lignin derivatives, organic chemistry, etc., to achieve good dispersion and heat resistance, mild reaction conditions, and improved hydrophilicity

Inactive Publication Date: 2016-12-14
安徽融创化工科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some disadvantages of using lignin as a dye dispersant, such as lignin's dyeing of fibers and its heat resistance stability

Method used

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  • Method for preparing reduced dye dispersant from papermaking black liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing a vat dye dispersant using papermaking black liquor includes the following steps:

[0018] 1) After deodorizing treatment, 62 parts of papermaking black liquor are added to the reaction kettle, heated to 85℃, and 35 parts of concentrated sulfuric acid are slowly added while stirring, stirring, sulfonation reaction 40min, heat preservation 1h, obtain sulfonated papermaking black liquid;

[0019] 2) Cooling the reaction system in step 1) to 75°C, adding lye to adjust the pH to 11, stirring, adding 22 parts of formaldehyde and 8 parts of phenol dropwise to carry out condensation reaction, the reaction time is 3h;

[0020] 3) Add 7 parts of 2-naphthalenesulfonic acid formaldehyde polymer sodium salt to the step 2) reaction system, stir evenly, raise the temperature to 85° C., keep the temperature for 1 hour, then lower the temperature, and spray dry to obtain the product.

Embodiment 2

[0022] A method for preparing a vat dye dispersant using papermaking black liquor includes the following steps:

[0023] 1) After 60 parts of papermaking black liquor is deodorized, add it to the reactor, heat to 80℃, slowly add 40 parts of concentrated sulfuric acid while stirring, stir, sulfonate reaction for 30min, keep for 1h, get sulfonated papermaking black liquid;

[0024] 2) Cooling the reaction system in step 1) to 70°C, adding lye to adjust the pH to 10, stirring, adding 20 parts of formaldehyde and 12 parts of phenol dropwise to perform condensation reaction, the reaction time is 2h;

[0025] 3) Add 10 parts of 2-naphthalenesulfonic acid formaldehyde polymer sodium salt to the step 2) reaction system, stir evenly, raise the temperature to 80° C., keep the temperature for 1 hour, then lower the temperature, and spray dry to obtain the product.

Embodiment 3

[0027] A method for preparing a vat dye dispersant using papermaking black liquor includes the following steps:

[0028] 1) After deodorizing treatment, 70 parts of paper-making black liquor are added to the reactor, heated to 90℃, and 30 parts of concentrated sulfuric acid are slowly added while stirring, stirring, sulfonation reaction is 40 minutes, and the temperature is kept for 1 hour to obtain sulfonated paper-making black. liquid;

[0029] 2) Cool the reaction system in step 1) to 75°C, add lye to adjust the pH to 11, stir, add 30 parts of formaldehyde and 12 parts of phenol dropwise to carry out the condensation reaction, the reaction time is 3h;

[0030] 3) Add 5 parts of 2-naphthalenesulfonic acid formaldehyde polymer sodium salt to the step 2) reaction system, stir evenly, raise the temperature to 85° C., keep the temperature for 1 hour, then lower the temperature, and spray dry to obtain the product.

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Abstract

The invention discloses a method for preparing reduced dye dispersant from papermaking black liquid. The method includes the following steps that 1, after being pretreated, the papermaking black liquid is added into a reaction still, the papermaking black liquid is heated to 80-90 DEG C, concentrated sulfuric acid is slowly added under stirring for a sulfonation reaction for 30-40 min, and heat preservation is carried out for 1 h; 2, the reaction system in the step 1 is cooled to 70-75 DEG C, the pH value is adjusted, stirring is carried out, formaldehyde and phenol are added dropwise, and a condensation reaction is carried out for 2-3 h; 3, 2-naphthalene sulfonic acid-formaldehyde polymer sodium salt is added into the reaction system in the step 2, stirring is carried out, the temperature is raised to 80-85 DEG C, cooling is carried out after heat preservation is carried out for 1 h, spray drying is carried out, and the product is obtained. The prepared dispersant has good dispersion performance and heat resistance, the preparation reaction conditions are mild, the method is simple and easy to operate, the papermaking black liquid is effectively utilized, pollution of waste emission to environment is avoided, and remarkable social benefits and economic benefits are achieved.

Description

Technical field [0001] The invention relates to the technical field of vat dye dispersants, in particular to a method for preparing vat dye dispersants using papermaking black liquor. Background technique [0002] Vat dye is a kind of water-insoluble dye, and it is inseparable from dispersant in post-processing dyeing or printing. Most of the powdery or granular vat dyes sold on the market contain 30% to 70% or even more dispersant. The quality of the dispersant directly affects the quality of the dye and the entire dyeing process. Modified lignin dispersant is one of the dye dispersants commonly used in domestic and foreign markets. However, the use of lignin as a dye dispersant has some disadvantages, such as the dyeing of lignin to fibers and its heat resistance stability. The lignin needs to be modified to improve its performance. [0003] The papermaking industry widely adopts the alkaline papermaking process, which produces a large amount of papermaking wastewater, commonl...

Claims

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Application Information

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IPC IPC(8): C08H7/00
CPCC08H6/00C07G1/00
Inventor 王洪卫徐卉香李振蒋大为高鸿宇郭元
Owner 安徽融创化工科技股份有限公司