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Active red dye preparation method

A technology of reactive red dye and sulfonated para-ester, which is applied in the field of preparation of reactive red dye, can solve the problems of low dye content, increased waste water, unfavorable environment, etc., to reduce salt content, reduce waste water volume, and improve environmental protection sexual effect

Active Publication Date: 2016-04-27
ZHEJIANG JINGGUANG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In this synthesis method, a large amount of hydrochloric acid is added in the diazotization process, and a large amount of alkali needs to be added for neutralization in the subsequent coupling process, resulting in a low dye strength in the final synthesis, which reduces the dyeing effect; and it will lead to waste water in the printing and dyeing process increase, adversely affecting the environment

Method used

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Examples

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Effect test

Embodiment 1

[0035] (1) Put 2000kg of fuming sulfuric acid (containing 25% sulfur trioxide) in a 3000L sulfonation pot, and put 840kg of p-hydroxyethyl sulfone acetanilide into the sulfonation pot evenly in about 3 hours under stirring conditions, and feed During the process, keep the temperature ≤35°C. After the feeding is completed, use steam to slowly raise the temperature to about 80°C, use the heat of reaction to raise the temperature to 110°C, keep the temperature for reaction, and then raise the temperature to 130°C for reaction.

[0036] (2) After the reaction, use cold water to cool down to below 60°C, and then add water dropwise into the pot. The temperature is controlled not to exceed 60°C during the dropwise addition, and it takes about 3 hours. After adding water, raise the temperature to 98±1°C, and keep the temperature for 10 hours. , cooled to 25°C.

[0037] (3) Add 1000kg of bottom water to the dilution pot, start stirring, put in 1500kg of crushed ice, then put the sulfo...

Embodiment 2

[0044] (1) Put 2000kg of fuming sulfuric acid (containing 25% sulfur trioxide) in a 3000L sulfonation pot, and put 840kg of p-hydroxyethyl sulfone acetanilide into the sulfonation pot evenly in about 3 hours under stirring conditions, and feed During the process, keep the temperature ≤35°C. After the feeding is completed, use steam to slowly raise the temperature to about 80°C, use the heat of reaction to raise the temperature to 110°C, keep the temperature for reaction, and then raise the temperature to 130°C for reaction.

[0045] (2) After the reaction, use cold water to cool down to below 60°C, and then add water dropwise into the pot. The temperature is controlled not to exceed 60°C during the dropwise addition, and it takes about 3 hours. After adding water, raise the temperature to 98±1°C, and keep the temperature for 10 hours. , cooled to 25°C.

[0046] (3) Add 1000kg of bottom water to the dilution pot, start stirring, put in 1500kg of crushed ice, then put the sulfo...

Embodiment 3

[0053] (1) Put 2000kg of fuming sulfuric acid (containing 25% sulfur trioxide) in a 3000L sulfonation pot, and put 840kg of p-hydroxyethyl sulfone acetanilide into the sulfonation pot evenly in about 3 hours under stirring conditions, and feed Keep the temperature ≤35°C during the process. After the feeding is completed, use steam to slowly raise the temperature to about 80°C, use the heat of reaction to raise the temperature to 110°C, keep the temperature for reaction, and then raise the temperature to 130°C for reaction.

[0054] (2) After the reaction, use cold water to cool down to below 60°C, and then add water dropwise into the pot. The temperature is controlled not to exceed 60°C during the dropwise addition, and it takes about 3 hours. After adding water, raise the temperature to 98±1°C, and keep the temperature for 10 hours. , cooled to 25°C.

[0055] (3) Add 1000kg of bottom water to the dilution pot, start stirring, put in 1500kg of crushed ice, then put the sulfon...

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Abstract

The present invention discloses an active red dye preparation method comprising the following steps: (1) a sulfonated para-ester is obtained by successive sulfonation, hydrolysis, dilution and salting-out of p-hydroxyethyl sulfone acetanilide as a starting material; (2) the acid number of the sulfonated para-ester is detected, according to the detected acid number, hydrochloric acid is added, and after the reaction is completed, a sulfonated para-ester diazonium salt is obtained; (3) a first-coupling fluid is obtained by first coupling of the sulfonated para-ester diazonium salt obtained by the step (2) and a J acid; and (4) an active red dye is obtained by secondary coupling of the first-coupling fluid obtained by the step (3) and a cresidine para-ester diazonium salt and processing. According to the method, on the basis of the acid number of the prepared sulfonated para-ester diazonium salt, the addition amount of the hydrochloric acid is determined, and the obtained active red dye has better strength.

Description

technical field [0001] The invention belongs to the field of reactive dyes, and in particular relates to a preparation method of reactive red dyes. Background technique [0002] Reactive dyes, also known as reactive dyes. It is a class of dyes that chemically react with fibers during dyeing. Such dye molecules contain groups that can chemically react with fibers. When dyeing, the dyes react with the fibers and form covalent bonds between them to form a whole, which improves the fastness to washing and rubbing. Reactive dyes are a new class of dyes. In 1956, the UK first produced reactive dyes of the Procion brand. Reactive dye molecules include two main components, the parent dye and the active group, and the group that can react with the fiber is called the active group. [0003] Reactive red dye is one of the most important reactive dyes, which can be used to dye fabrics red, or mixed with other colors to form more complex dyes. [0004] The Chinese patent application...

Claims

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Application Information

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IPC IPC(8): C09B62/513
CPCC09B62/513
Inventor 王国林朱友强
Owner ZHEJIANG JINGGUANG IND
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