Preparation technique for diazo liquid of benzidine yellow G

A benzidine yellow and preparation technology, applied in the direction of disazo dyes, etc., can solve problems such as nitric oxide and nitrogen dioxide, unsatisfactory control parameter settings, and human hazards

Inactive Publication Date: 2013-11-06
瑞安宝源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of pigments generally includes firstly preparing diazonium liquid, and then reacting with other additives to prepare pigments. The control parameter setting in the existing diazo liquid production process is not ideal, and it is easy to produce toxic reaction between raw material dichloride and sodium nitrite. Gases such as nitric oxide and nitrogen dioxide can cause harm to people

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Dichloride beating: add 750KG of water to the diazo tank, then add 125KG of hydrochloric acid, the concentration of the hydrochloric acid is 30%, put 80KG of dichloride into the diazo tank, the dichloride is 3-3- Dichlorobenzidine hydrochloride, turn on the stirring button of the stirrer, stir and beating, the beating time is 2 hours, add ice cubes under the situation of stirring, and the ice cubes are broken ice cubes. Cool the feed liquid in the diazo tank to 0°C;

[0018] (2) Diazotization: Quickly add 39KG of sodium nitrite solution into the diazo tank within 2 minutes, the concentration of sodium nitrite is 40%, keep the temperature of the material liquid at 5°C while stirring, and keep the reaction The time is 40min,

[0019] Put in 1.5KG of activated carbon, stir for 10 minutes below 5°C, add water to make the total volume in the diazo tank reach 1050L, add 0.5KG of 9-fold diluted Taikoo oil, stir for 1 minute, and then stand still;

[0020] (3) Suction fil...

Embodiment 2

[0022] (1) Dichloride beating: add 700KG of water to the diazo tank, then add 110KG of hydrochloric acid, the concentration of the hydrochloric acid is 30%, put 70KG of dichloride into the diazo tank, the dichloride is 3-3- Dichlorobenzidine hydrochloride, turn on the stirring button of the stirrer, stir and beating, the beating time is 1 hour, add ice cubes under the situation of stirring, the ice cubes are ice cubes that have been broken. Cool the feed liquid in the diazo tank to 0°C;

[0023] (2) Diazotization: quickly add 38.4KG sodium nitrite solution into the diazo tank within 1min, the concentration of sodium nitrite is 40%, keep the temperature of the material liquid at 5°C while stirring, and keep the reaction The time is 80min,

[0024] Put in 1.4KG of activated carbon, stir at 5°C for 7 minutes, add water to make the total volume in the diazo tank reach 1120L, add 0.5KG of Taikoo oil diluted 10 times, stir for at least 1 minute, and then stand still;

[0025] (3) ...

Embodiment 3

[0027] (1) Dichloride beating: add 700KG of water to the diazo tank, then add 105KG of hydrochloric acid, the concentration of hydrochloric acid is 32%, put 70KG of dichloride into the diazo tank, the dichloride is 3-3-dichlorobis Aniline hydrochloride, turn on the stirring button of the stirrer, stir and beating, the beating time is 1.5 hours, add ice cubes under the situation of stirring, the ice cubes are broken ice cubes. Cool the feed liquid in the diazo tank to -3°C;

[0028] (2) Diazotization: quickly add 38.4KG of sodium nitrite solution into the diazonium tank within 0.5min, the concentration of sodium nitrite is 38%, keep the temperature of the material liquid at 3°C ​​while stirring, and keep the reaction The time is 40min,

[0029] Put in 1.2KG of activated carbon, stir at below 5°C for 5 minutes, add water to make the total volume in the diazo bucket reach 1090L, add 0.6KG of Taikoo oil diluted 11 times, stir for 5 minutes, and then stand still;

[0030] (3) Suc...

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PUM

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Abstract

The invention discloses a preparation technique for diazo liquid of benzidine yellow G. The preparation technique includes steps of: double chloride beating: 650-750 KG of water, 105-125 KG of 30-35% hydrochloric acid and 60-80 KG of double chloride are filled in a diazo barrel to be stirred and beat for at least 1h, and ice cubes are filled in the barrel to lead temperature of material liquid in the barrel to be cooled to be below 0 DEG C; diazotizing: 38.4-39 KG of 38-42% sodium nitrite is filled in the barrel and reacts fro 40-90 min at temperature below 5 DEG C, 0.9-1.5 KG of activated carbon is filled in the barrel to be stirred for 3-10 min, water is filled in the barrel to lead the total volume to reach 1050-1150 L, 0.3-0.7 KG of Turkey red oil is filled after all liquid in the barrel is diluted for 9-11 times and is stirred for at least 1 min, and the liquid is led to stand; suction filtration: diazo liquid is filtered through a cloth bag during suction filtration. The preparation technique can prevent double chloride from having homocoupling reactions, and the quantity of generated poisonous gases is small.

Description

technical field [0001] The invention relates to a preparation process of a pigment, in particular to a preparation process of a diazonium solution of benzidine yellow G. Background technique [0002] Along with the raising of living standard, pigment, paint are widely used in people's life, can be used for beautifying people's living environment. For better coating, in many places where pigments are used, in order to meet the requirements of high resolution, it is necessary to produce pigments with regular shape and good fluidity. At present, existing pigments are generally prepared by processes such as mixing, kneading, pulverizing, grading, and adding additives. The preparation of pigments generally includes firstly preparing diazonium liquid, and then reacting with other additives to prepare pigments. The control parameter setting in the existing diazo liquid production process is not ideal, and the reaction of raw materials dichloride and sodium nitrite is easy to produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C245/20C09B35/10
Inventor 张绍光林侯杰毛明学戴世全杨乾辉林昌同
Owner 瑞安宝源化工有限公司
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