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Method for cooperatively producing white carbon black and inorganic salt with acid wastewater

A technology for acidic wastewater and inorganic salts, applied in chemical instruments and methods, inorganic chemistry, multi-stage water treatment, etc., can solve the problems of high cost of acidic wastewater treatment, difficulty in realizing resource reuse, etc., to solve the problem of acidic wastewater, The effect of reducing the pressure of wastewater post-treatment and high utilization of raw materials

Active Publication Date: 2016-05-04
JIANGSU SHENGJI CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for using acid wastewater to co-produce white carbon black and inorganic salts, which solves the problems of high cost of acid wastewater treatment and difficulty in resource reuse in the prior art

Method used

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  • Method for cooperatively producing white carbon black and inorganic salt with acid wastewater
  • Method for cooperatively producing white carbon black and inorganic salt with acid wastewater
  • Method for cooperatively producing white carbon black and inorganic salt with acid wastewater

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Embodiment 1

[0056] Sodium m-nitrobenzenesulfonate is a commonly used dye intermediate. Its precursor, m-nitrobenzenesulfonic acid, is usually prepared by adding nitrobenzene dropwise into sulfuric acid for sulfonation reaction. The reaction equation is usually as follows:

[0057]

[0058] After the sulfonation reaction is finished, a large amount of waste sulfuric acid will be produced.

[0059] A kind of method of present embodiment utilizes sulfonated waste acid to co-produce white carbon black and inorganic salt (its flow chart is as follows figure 1 ),include:

[0060] After diluting the above-mentioned sulfonated waste acid (sampling analysis: sulfuric acid content is 30%, chromaticity is 50 times, TOC value is 1200mg / l), take 1000kg and put it in the neutralization tank, start stirring, add hydrogen peroxide 2kg, Oxidation at ℃ for 1 hour, then add 3kg of activated carbon, decolorize by adsorption at 40-42℃ for 1 hour, then filter to remove the activated carbon residue, recover...

Embodiment 2

[0062] In the production process of dye intermediates, the reaction equation of the sulfonation reaction of Turbine's acid is as follows:

[0063]

[0064] After the sulfonation reaction is finished, a large amount of waste sulfuric acid will be produced.

[0065] A kind of method of present embodiment utilizes sulfonated waste acid to co-produce white carbon black and inorganic salt (its flow chart is as follows figure 2 ),include:

[0066] After diluting the above-mentioned sulfonated waste acid (sampling analysis: sulfuric acid content is 35%, chroma is 30 times, TOC value is 1300mg / l), take 1000kg and put it into the neutralization tank, start stirring, take 450kg of sodium silicate and put it into the dissolving Add 1000kg of water into the pot, heat and dissolve with 0.6Mpa, 165°C steam, remove the alkali residue by filtering with an underflow filter press after dissolving, and recover the sodium silicate solution for use; then add sulfonated waste to the sodium sil...

Embodiment 3

[0069] In the production process of dye intermediates, the reaction equation of amino oil esterification reaction is as follows:

[0070]

[0071] This reaction is used to prepare the meta-ester, and a large amount of waste sulfuric acid is produced after the reaction is completed.

[0072] A method of utilizing esterification waste acid to co-produce white carbon black and inorganic salts in this embodiment includes:

[0073] After diluting the above-mentioned esterification waste acid (sampling analysis: sulfuric acid content is 25%, chromaticity 20 times, TOC value 2000mg / l), get 1000kg and put in the neutralization kettle, start stirring, add chlorine dioxide 3kg, in 30 Oxidize at ℃ for 0.5 hours, then add 5kg of activated carbon, decolorize by adsorption at 30℃ for 1 hour, then filter to remove the activated carbon residue, recover the waste esterified acid after removing impurities, and put it into the dissolution pot , add 1000kg of water, use 0.6Mpa, 165 ℃ steam he...

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Abstract

The invention discloses a method for cooperatively producing white carbon black and inorganic salt with acid wastewater. The method includes the steps that the acid wastewater is purified and then added into a sodium silicate solution for a neutralization reaction, filtration is carried out after the reaction is completed, filtration residues are dried to obtain white carbon black, and filtration liquor is concentrated and dried to obtain inorganic salt; or, the acid wastewater is added into a sodium silicate solution for a neutralization reaction, filtration is carried out after the reaction is completed, filtration residues are dried to obtain white carbon black, and filtration liquor is concentrated and dried after being purified to obtain inorganic salt, wherein the acid wastewater is at least one of sulfonation waste acid, esterification waste acid, acidic coupling waste acid, mixed acid nitration waste acid, acidic hydrolysis waste acid and bromination waste acid. In this way, the treatment cost of the acid wastewater is reduced, beneficial reuse of the acid wastewater is achieved, and white carbon black and inorganic salt obtained in the production are high in content and can be directly used. Prepared white carbon black and inorganic salt completely meet industrial product use requirements, and zero discharge of the acid wastewater is achieved in the dye production process.

Description

technical field [0001] The invention relates to a treatment technology for acidic waste water produced in the production process of dye monomers or dye intermediates, in particular to a method for co-producing white carbon black and inorganic salts by using acidic waste water. Background technique [0002] The substituents of dye monomers and dye intermediates contain amino groups, sulfonic acid groups, nitro groups, halogen groups, etc., and the industrial production of these groups requires the use of a large amount of acids (such as sulfuric acid, nitric acid, chlorosulfonic acid, etc.) ), resulting in a large amount of acidic wastewater that is difficult to use directly. At present, most production enterprises first use lime or calcium carbide slag to neutralize and precipitate acid wastewater to treat acid wastewater, and then filter out the precipitated sludge containing calcium sulfate. [0003] However, because some toxic and harmful substances are contained in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01B33/12
CPCC01B33/128C02F1/001C02F1/281C02F1/283C02F1/66C02F1/72C02F1/722C02F1/76C02F1/78C02F9/00C02F2301/08C02F2305/026
Inventor 华新珍
Owner JIANGSU SHENGJI CHEM