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A kind of method preparing ferrous sulfate

A technology of ferrous sulfate and concentrated sulfuric acid, which is applied in the direction of ferric sulfate, can solve the problems of high toxicity of chlorinated benzene, flammability hazards, and high environmental protection pressure, and achieve the goal of less process water consumption, improved extraction and separation efficiency, and reduced consumption Effect

Active Publication Date: 2021-04-09
SHAOXING JIANG HUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process is: the amount of water added is insufficient and the precipitation of nitrates is not complete. Adding a large amount of water will generate a large amount of dilute sulfuric acid.
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
However, it uses a large amount of chlorinated benzene as a raw material, but chlorinated benzene is highly toxic, and when the explosive is mixed with air, it will be explosive and flammable when it is heated. Conducive to industrial production, high pressure on environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a) Add 300 kg of process water into the water analysis kettle, start stirring, slowly put in 1000 kg of nitrated nitrated products, and stir at room temperature for 5 hours;

[0025] b) 1300 kg of water analysis kettle material enters the slot of the screw distributor from the outer pipe inlet of the CA226 decanter, and enters the conical end through the extraction area in the opposite flow direction to the extractant, and is used as the waste sulfuric acid solution from the decanter 400 kg of dichloromethane enters the distributor from the inlet of the inner pipe, and passes through the extraction zone in the opposite flow direction to that of the water analysis tank material to the end of the reversing drum equipped with a variable control disc and enters the separation rotor. In the tympanic chamber, leave it as an extract with the help of a porous disc, and discharge it with the pressure of a centripetal pump to obtain a nitric acid solution; test results: the acid c...

Embodiment 2

[0028] a) Add 400 kg of process water into the water analysis kettle, start stirring, slowly put in 1000 kg of nitrated nitrated products, and stir at room temperature for 5 hours;

[0029] b) 1,400 kg of water analysis kettle material enters the slot of the screw distributor from the outer pipe inlet of the CA290 decanter, and enters the conical end through the extraction area in the opposite flow direction to the extractant, as the waste sulfuric acid solution from the decanter 450 kg of dichloromethane enters the distributor from the inlet of the inner pipe, and passes through the extraction area in the opposite flow direction to that of the water analysis tank material to reach the end of the reversing drum equipped with variable control discs and enters the separation rotor. In the tympanic chamber, leave it as an extract with the help of a porous disc, and discharge it with the pressure of a centripetal pump to obtain a nitrochloride solution. The test result: the acid co...

Embodiment 3

[0032] a) Add 200 kg of process water to the water analysis kettle, start stirring, slowly put in 1000 kg of nitrated nitrated products, and stir at room temperature for 5 hours;

[0033] b) 1200 kg of water analysis kettle material enters the slot of the screw distributor through the inlet of the outer pipe of the CA226 decanter, and enters the conical end through the extraction area in the opposite flow direction to the extraction agent, as the waste sulfuric acid solution from the decanter 400 kg of dichloromethane enters the distributor from the inlet of the inner pipe, and passes through the extraction zone in the opposite flow direction to that of the water analysis tank material to reach the end of the reversing drum equipped with variable control discs and enters the separation rotor. In the tympanic chamber, leave it as an extract with the help of a porous disc, and use the pressure of the centripetal pump to discharge the nitric acid solution. The test result: the aci...

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PUM

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Abstract

The invention relates to a method for preparing ferrous sulfate, which uses low toxicity and nonflammable methylene chloride instead of highly toxic, flammable and explosive organic reagents such as chlorinated benzene as an extraction agent, and uses a decanter for extraction, which can effectively Improve the efficiency of extraction and separation, reduce the amount of extractant, remove the organic impurities in the acid through extraction, reduce the impurity content in the acid, so that the obtained sulfuric acid solution can be directly used to prepare ferrous sulfate, and the prepared ferrous sulfate product The quality has reached GB10631‑89 industrial superior product.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing ferrous sulfate. Background technique [0002] As we all know, 2-cyano-4-nitroaniline is a very important intermediate of disperse dyes. However, due to the complex steps of the traditional synthesis process of 2-cyano-4-nitroaniline, there are many by-products and the yield is low. , low purity, unable to meet the requirements of this field for the annual output of 2-cyano-4-nitroaniline, also unable to meet increasingly stringent quality requirements and environmental protection requirements. In the production of 2-cyano-4-nitroaniline, after the nitrate 2-cyano-4-nitrochlorobenzene is formed, it must be separated from sulfuric acid containing a small amount of nitric acid. The traditional process is to use the different solubility of nitrates in water and concentrated sulfuric acid, add sulfuric acid containing nitrates to water for analysis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/14
CPCC01G49/14
Inventor 李江华
Owner SHAOXING JIANG HUA CHEM
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