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New technology for recycling sulfuric acid in production of 2-cyano-4-nitroaniline

A technology of nitroaniline and a new process, which is applied in the new process field of sulfuric acid recycling, can solve the problems of high energy consumption of sulfuric acid and low concentration of waste acid, and achieve the effect of reducing the cost of acid concentration

Active Publication Date: 2016-08-17
河北嘉泰化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process is: the concentration of waste acid obtained after water analysis is low, and the energy consumption of sulfuric acid concentrated to a concentration of more than 75% is too large

Method used

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  • New technology for recycling sulfuric acid in production of 2-cyano-4-nitroaniline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Major equipment:

[0024] serial number

device name

Specification

material

use

1.

Water analysis kettle

10000L

enamel

dilute with water

2.

Extraction and phase separation tank

10000L

enamel

Extraction with benzene chloride

2.

Acid Concentrator

10000L

enamel

dilute acid concentration

[0025] The amount and quality of extraction raw materials

[0026] process

Material name

Weight (Kg)

Water analysis

process water

4000

extraction

Extractant: Chlorinated benzene

5500

[0027] Add 4,000 kg of process water into the water analysis kettle, start stirring, slowly put in the nitrated nitrated product, and control the temperature at 30-35°C. Add 5,500 kilograms of chlorinated benzene after discharging the material, stir for half an hour and let it stand for half an hour to obtain dilute sulfuric acid by separation.

[0028] Test res...

Embodiment 2

[0034] Major equipment:

[0035] serial number

device name

Specification

material

use

1.

Water analysis kettle

10000L

enamel

dilute with water

2.

Extraction and phase separation tank

10000L

enamel

Extraction with benzene chloride

2.

Acid Concentrator

10000L

enamel

dilute acid concentration

[0036] The amount and quality of extraction raw materials

[0037] process

Material name

Weight (Kg)

Water analysis

process water

4000

extraction

Extractant: Chlorinated benzene

5500

[0038] Add 4,000 kg of process water into the water analysis tank, start stirring, slowly put in the nitrated nitrated product, and control the temperature at 40-45°C. Add 5,500 kilograms of chlorinated benzene after discharging the material, stir for half an hour and let it stand for half an hour to obtain dilute sulfuric acid by separation.

[0039] Test resul...

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PUM

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Abstract

The invention belongs to the field of chemical industry, and relates to a new technology for recycling sulfuric acid in a technology of using concentrated sulfuric acid and concentrated nitric acid to nitrify o-chlorobenzonitrile so as to generate 2-cyano-4-nitro chlorobenzene. An extraction technology is used for extracting a product and nitration by-product impurities from waste acid of nitration, so that pure waste acid is obtained; dilute sulfuric acid is concentrated to 75% or more by using concentration equipment; therefore, the defects that the traditional technology is high in energy consumption, high in pollution and the like are overcome; the technology is free from generation of waste acid, thus being very environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a new process for recycling sulfuric acid in the production of 2-cyano-4-nitroaniline. Background technique [0002] In the production of 2-cyano-4-nitroaniline, the traditional process is to nitrate o-chlorobenzonitrile with concentrated sulfuric acid and concentrated nitric acid to generate 2-cyano-4-nitrochlorobenzene, and add a large amount of water to precipitate nitrates. Then wash with water, add an organic solvent to dissolve the nitrate, and then use the ammonolysis reaction to obtain the product 2-cyano-4-nitroaniline. The disadvantage of this process is that the concentration of waste acid obtained after water analysis is low, and the energy consumption of sulfuric acid concentrated to a concentration of more than 75% is too large. Contents of the invention [0003] The purpose of the present invention is to provide a new technology for recycling sulfuri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/30C07C253/34C07C255/50
CPCC07C253/30C07C253/34C07C255/50
Inventor 万茂光房永法雷明远陈泽海孟铎
Owner 河北嘉泰化工科技有限公司
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