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Method for directly producing water soluble aniline black

A water-soluble nigrosine, direct technology, applied in the direction of benzene azine dyes, organic chemistry, etc., can solve the problems of high energy consumption, long production process cycle, large waste of heat energy, etc., to reduce waste water discharge and improve labor production efficiency , the effect of saving energy and labor resources

Inactive Publication Date: 2010-09-01
严纪一
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process has a long cycle and high energy consumption. It takes 2.5 tons of standard coal to produce one ton of water-soluble nigrosine, which results in a large waste of heat energy.

Method used

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  • Method for directly producing water soluble aniline black
  • Method for directly producing water soluble aniline black
  • Method for directly producing water soluble aniline black

Examples

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Embodiment Construction

[0029] The invention discloses a method for directly producing water-soluble nigrosine, the specific steps of which are:

[0030] Step 1, aniline and nitrobenzene are condensed under the catalysis of ferric chloride;

[0031] Step 2, naturally cooling the condensed mixture to normal temperature;

[0032] Step 3, pulverizing the naturally cooled mixture and directly putting it into sulfuric acid for sulfonation reaction;

[0033] Step 4, the sulfonated mixture is placed in cold water for isolation;

[0034] Step 5, performing solid-liquid separation and washing with water on the separated mixture, and then performing dehydration treatment;

[0035] Step 6, neutralizing the dehydrated mixture with sodium hydroxide or sodium carbonate;

[0036] Step 7, drying the neutralized mixture to obtain granular water-soluble nigrosine.

[0037] On the basis of above-mentioned technical scheme, also comprise the following steps:

[0038] Step 8, pulverizing the granular water-soluble n...

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Abstract

The invention discloses a method for directly producing water soluble aniline black, and relates to the preparation of an azine acid dye. The method particularly comprises the following steps of: 1, performing condensation reaction on aniline and nitrobenzene in the presence of iron trichloride serving as a catalyst; 2, naturally cooling the condensed mixture to normal temperature; 3, crushing the naturally cooled mixture and directly putting the crushed mixture into sulfuric acid for sulfonation reaction; 4, placing the sulfonated mixture in cold water for separation; 5, performing solid-liquid separation and washing on the separated mixture and then performing dehydration; 6, neutralizing the dehydrated mixture with sodium hydroxide or sodium carbonate; and 7, drying the neutralized mixture so as to obtain the granular water soluble aniline black. The method for directly producing the water soluble aniline black of the invention simplifies the processing steps, shortens the process period, saves a large amount of energy sources and labor resources, reduces the waste water discharge and greatly improves the labor efficiency and production efficiency.

Description

technical field [0001] The invention relates to the preparation of azine acid dyes, in particular to a method for directly producing water-soluble nigrosine. Background technique [0002] The molecular formula of water-soluble nigrosine in azine acid dyes (index number: [CI] ACID BLACK 2 (52420)) is C 36 h 26 o 6 N 5 S 2 N a (see figure 1 ), the alias names of water-soluble nigrosine are: acid particle element, acid particle element NBL, acid skin element NL, acid particle element blue, acid black 2; English names are: Acid nigrosine, C.I.Acid black 2, calco nigrosine o 2p , ci 50420, ci acid black 2, lurazol deep blue eb, nigrosin, nigrosine b, nigrosine wl water soluble, nigrosine wsb; usually granular or powdery; widely used in wool dyeing (in a strong acid bath, pH mastered Below 3.5, add sodium starch as a retarding agent to improve level dyeing), high-grade ink, silk dyeing (in the scouring solution, add acetic acid or sulfuric acid to get gray black), leather b...

Claims

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Application Information

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IPC IPC(8): C07D241/46C09B17/02
Inventor 严纪一
Owner 严纪一
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