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A kind of synthetic method of azo disperse dye

A technology of disperse dyes and synthesis methods, which is applied in the field of azo disperse dye synthesis to achieve environmental benefits and economic benefits, reduce the amount of acid used, and reduce the pressure of wastewater treatment

Active Publication Date: 2015-11-18
HANGZHOU JIHUA JIANGDONG CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention only improves the efficiency of dye wastewater treatment, but does not fundamentally solve the problem of acid wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Under the condition of 90~95°C, add N-cyanoethyl-N-benzoyloxyethylaniline material (containing about 4.5 kmol) by adding CNF100kg, 10 # OP147.5kg, keep stirring for 30min. Quickly add ice and cool down to 50°C, the material precipitates, turn on the high-speed shear homogeneous emulsification pump to disperse the material, disperse for 8 hours, and make the coupling components into a uniform suspension for use.

[0025] Add 2000kg of water into a 5000L dissolving pot, then slowly add 867kg of 98% sulfuric acid, control the temperature not to exceed 70°C, add 683.1kg (4.95kmol) of p-nitroaniline, and use the residual heat to dissolve it. Add 6,000g of ice water to a 50,000L coupling pot, add the above-mentioned dissolved p-nitroaniline in a trickle, control the temperature at 0~5°C, and quickly pour in a solution of 375.7kg (5.445mol) of sodium nitrite dissolved in 880L of water. Use starch potassium iodide test paper to ensure that the sodium nitrate is always excessi...

Embodiment 2

[0029] At 90~95°C, add NNO11kg to the prepared N,N-dicyanoethylaniline material (containing about 4.5kmol of N,N-dicyanoethylaniline) weighing about 1100kg, and keep stirring for 30min. Quickly add ice and cool down to 0°C, the material precipitates, turn on the high-speed shear homogeneous emulsification pump to disperse the material, disperse for 4 hours, and make the coupling components into a uniform suspension for use.

[0030] Add 2137.6kg of 98% sulfuric acid into the ortho-chlorine beating pot, stir, jacket cooling, add 737.4kg (4.275kmol) of ortho-chlorine ortho-chlorine at a temperature below 60°C. After the addition, adjust the temperature to 65±2°C to completely dissolve the o-chlorine, and keep it at this temperature for 2 hours. Add 10,000kg of ice water to a 50,000L coupling pot, add the above-mentioned dissolved o-chlorine in a trickle, control the temperature below 0°C, and stir for 1 hour after adding. Slowly add a solution of 321.5kg (4.660kmol) of sodium n...

Embodiment 3

[0033] At 90~95°C, add MF60kg, Tween- 8060kg, keep stirring for 30min. Quickly add ice and cool down to 30°C, the material precipitates, turn on the high-speed shear homogeneous emulsification pump to disperse the material, disperse for 1 hour, and make the coupling components into a uniform suspension for use.

[0034] Add 2000kg of water into a 5000L dissolving pot, then slowly add 812kg of 98% sulfuric acid, control the temperature not to exceed 70°C, add 639.6kg (4.635kmol) of p-nitroaniline, and use the residual heat to dissolve it. Add 5600g of ice water to a 50,000L coupling pot, add the above-mentioned dissolved p-nitroaniline in a trickle, control the temperature at 0~5°C, and quickly pour in a solution of 351.8kg (5.10mol) of sodium nitrite dissolved in 820L of water. Use starch potassium iodide test paper to ensure that the sodium nitrate is always excessive, and keep it at 5-10°C for 1 hour for later use.

[0035] Add 33kg of sulfamic acid to the diazonium salt abo...

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PUM

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Abstract

The invention belongs to the chemical field of dyes, and solves a problem that much acid wastewater is produced in a production process of disperse azo dyes. The invention discloses a synthetic method for disperse azo dyes, and the synthetic method comprises the following steps of: separating out coupling components, dispersing coupling components, carrying out diazotization and coupling reaction; dosage of acid can be greatly reduced in a production process; under the condition of ensuring dye quality, so that not only is production cost lowered, but also wastewater treatment pressure is relieved, and therefore, unification of environmental benefits and economic benefits is realized better.

Description

technical field [0001] The invention belongs to the field of dye chemical industry, and more specifically relates to a new technology for the synthesis of azo disperse dyes. Background technique [0002] With the rapid development of the dye industry, the discharge of dye industry wastewater has also increased sharply. At the same time, with the improvement of environmental protection requirements, the pressure of wastewater treatment is increasing day by day. More than 60% of the dyes in the dye industry have an azo structure, and coupling is a necessary step for the synthesis of such dyes. Most of them are synthesized under acidic conditions, especially for difficult-to-dissolve coupling components. Normal coupling can only be carried out after a large amount of acid is dissolved or under high coupling acidity, which not only increases the production cost, but also increases the waste acid in the coupling mother liquor. The amount of waste acid is high, and it is difficul...

Claims

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Application Information

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IPC IPC(8): C09B29/085C07C255/26C07C253/30
CPCC09B29/0003C09B29/0811C09B29/0813C09B29/0816C09B29/0817
Inventor 冯国仁孙岩峰陈美芬简卫
Owner HANGZHOU JIHUA JIANGDONG CHEMICAL CO LTD
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