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Preparation process of benzidine yellow

A preparation process, a technology of benzidine yellow, applied in the direction of disazo dyes, etc., can solve the problems of affecting the color concentration of pigments, uneven pigment hue, unstable product crystal form, etc., and achieve uniform color concentration and stable crystal form. Effect

Inactive Publication Date: 2013-11-13
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 preparing diazo liquid first, and then reacting with other additives to prepare pigments. The control parameters in the existing diazo liquid production process are not ideal, the hue of the obtained pigment is not uniform, and the crystal form of the product It will also be unstable, which will affect the color concentration of the pigment and affect the overall quality of the pigment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 1250L of water and 95KG of diacetanilide in the coupling barrel, and the concentration of diacetanilide is 100%. And add 2.5KG of additives, stir and beat for 70 minutes, add 200KG of 80% sodium acetate solution and 20 fillers, the fillers are inorganic fillers. Add ice cubes to reduce the overall temperature of the feed liquid to 17°C; the ice cubes are broken ice cubes. Adding concentration is 33% hydrochloric acid 13KG, makes the pH adjustment of feed liquid to 7;

[0019] Add 80KG of 100% diazo solution from the bottom of the coupling tank into the coupling tank. The diazo solution is dichloride, and the dichloride is 3-3-dichlorobenzidine hydrochloride. Stir and control the temperature of the feed solution at 9°C , and control the pH at 4.0;

[0020] In order to avoid excessive diazo solution, in the later stage of adding diazo solution, apply the wet ring test method to detect the material liquid in the coupling tank;

[0021] After completing the reaction,...

Embodiment 2

[0025] Add 1150L of water and 110KG of diacetanilide in the coupling barrel, and the concentration of diacetanilide is 98.5%. And add 3.5KG of additives, stir and beat for 60 minutes, add 1800KG of 65% sodium acetate solution and 18 fillers, the fillers are inorganic fillers. Add ice cubes to reduce the overall temperature of the feed liquid to 16°C; the ice cubes are broken ice cubes. Adding concentration is 10KG of hydrochloric acid of 32%, the pH of feed liquid is adjusted to 6;

[0026] Add 60KG100% diazo solution from the bottom of the coupling tank into the coupling tank. The diazo solution is dichloro, and the dichloro is 3-3-dichlorobenzidine hydrochloride. Stir and control the temperature of the feed liquid at 7°C, and Control the pH at 3.5;

[0027] In order to avoid excessive diazo solution, in the later stage of adding diazo solution, apply the wet ring test method to detect the material liquid in the coupling tank;

[0028] After completing the reaction, stop a...

Embodiment 3

[0032] Add 1190L of water and 100KG of diacetanilide in the coupling barrel, the concentration of diacetanilide is 99%. And add 2.9 KG of additives, stir and beat for 65 minutes, add 180-200KG of 76% sodium acetate solution and 15 fillers, the fillers are inorganic fillers. Add ice cubes to reduce the overall temperature of the feed liquid to 16°C; the ice cubes are broken ice cubes. Adding concentration is 12KG of hydrochloric acid of 32%, the pH of feed liquid is adjusted to 6.5;

[0033] Add 75KG100% diazo solution from the bottom of the coupling tank into the coupling tank. The diazo solution is dichloro, and the dichloro is 3-3-dichlorobenzidine hydrochloride. Stir and control the temperature of the feed liquid at 10°C, and Control the pH at 3.7;

[0034] In order to avoid excessive diazo solution, in the later stage of adding diazo solution, apply the wet ring test method to detect the material liquid in the coupling tank;

[0035] After completing the reaction, stop ...

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PUM

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Abstract

The invention discloses a preparation process of benzidine yellow, which is characterized by comprising the following steps of: adding 1150-1250L of water, 95-110 KG of acetoacetanilide and 2.5-3.5 KG of an assistant into a coupling barrel, mixing and beating the obtained mixture for 60-70 min, adding 180-200 KG of 56-100% sodium acetate and 15-30% filler into the coupling barrel, and adding ice blocks into the coupling barrel so as to cool the obtained object to 15-17 DEG C; adding 10-13 KG of a hydrochloric acid with the concentration of 30-33%, and adjusting the pH of the obtained mixture to be 6-7; adding 60-80 KG of 100% diazo fluid into the coupling barrel, controlling the temperature at 7-12 DEG C, and controlling the pH at 3.5-4.0; in the later period of adding the diazo liquid, carrying out detection by using a ring lubricating test method; and after the reaction is completed, stopping adding the diazo liquid, heating the liquid material to 90-120 DEG C by using steam, and carrying out heat preservation for 25-35 min. A pigment prepared according to the preparation process of the benzidine yellow is uniform in color strength and more stable in crystal form.

Description

technical field [0001] The invention relates to a preparation process of a pigment, in particular to a preparation process of benzidine yellow. 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 preparing diazo liquid first, and then reacting with other additives to prepare pigments. The control parameters in the existing diazo liquid production process are not ideal, the hue of the obtained pigment is not uniform, and the crystal form of the product It will also be unstable, thereby...

Claims

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Application Information

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IPC IPC(8): C09B35/10
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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