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Method for preparing energy-efficient H-acid

A high-efficiency, energy-saving, and effective technology, which is applied in the preparation of sulfonic acid, sulfonate, organic chemistry, etc., can solve the problems of large discharge of three wastes, low production capacity, and long process routes, so as to reduce economic costs and improve production efficiency Effect

Inactive Publication Date: 2016-06-22
JIANGSU JIHUA CHEMICAL CO LTD
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  • Claims
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Problems solved by technology

The production process is mainly intermittent operation, the process route is long, the production capacity is low, and the yield is low, and the discharge of three wastes is large

Method used

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  • Method for preparing energy-efficient H-acid
  • Method for preparing energy-efficient H-acid
  • Method for preparing energy-efficient H-acid

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Embodiment Construction

[0028] The technical solution of the present invention will be described in detail below in conjunction with the embodiments.

[0029] A kind of preparation method of the H-acid with high efficiency and energy-saving effect of the embodiment of the present invention comprises the following process:

[0030] Step 10) performing sulfonation treatment to obtain sulfonated compounds;

[0031] Step 20) Nitrate the sulfonated compound obtained in step 10) to obtain the nitrated compound;

[0032] Step 30) performing denitrification treatment on the nitrated compound obtained in step 20) to obtain the denitrified compound;

[0033] Step 40) extracting the denitrated substance obtained in step 30) to obtain dilute sulfuric acid and an extraction mixture, and performing back extraction on the extraction mixture to obtain a nitro-T acid solution;

[0034] Step 50) performing reduction treatment on the nitro-T acid solution obtained in step 40) to obtain an amino-T acid solution;

[0...

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Abstract

The invention discloses a method for preparing energy-efficient H-acid. The method comprises the steps of conducting sulfonation on liquid naphthalene to obtain a sulfonated substance, conducting nitration on the sulfonated substance to obtain a nitrated substance, conducting denitration on the nitrated substance to obtain a denitrated substance, conducting extraction on the denitrated substance to obtain dilute sulphuric acid and an extraction mixture, conducting reextraction on the extraction mixture to obtain nitro T-acid solution, conducting reduction on the nitro T-acid solution to obtain amino T-acid solution, conducting concentration on the amino T-acid solution and caustic soda liquid to obtain concentrated amino T-acid solution and caustic soda, conducting alkali fusion and dilution on the concentrated amino T-acid solution and caustic soda to obtain a diluted alkali fusion substance, conducting separation and filtration on the diluted alkali fusion substance to obtain H-acid filter cakes, and conducting drying on the H-acid filter cakes to obtain H-acid. By the adoption of the method, continuous production of H-acid can be achieved, and economic cost is low.

Description

technical field [0001] The invention relates to the field of preparation of dye raw materials, in particular to a preparation method of H-acid with high efficiency and energy saving effect. Background technique [0002] H-acid is an important raw material in the dye industry, mainly used in the production of reactive dyes, direct dyes, acid dyes, and can also be used in the production of color-changing acid and other products. The chemical name of H-acid is: 1-amino-8-naphthol-3,6-disulfonic acid. The chemical structural formula of H-acid is: [0003] [0004] Molecular formula of H-acid: C 10 h 9 NO 7 S 2 , relative molecular mass: 319.3. The dry product of H-acid is white to gray crystalline powder. Slightly soluble in cold water, easily soluble in hot water, soluble in alkaline solutions such as soda ash or caustic soda, it reacts with ferric chloride to turn brownish red purple, and dissolves in alkaline solution to turn dark green. [0005] H-acid manufacturi...

Claims

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Application Information

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IPC IPC(8): C07C303/22C07C309/50C07C303/06C07C309/35C07C309/40C07C303/32C07C309/47
CPCC07C303/06C07C303/22C07C303/32C07C309/35C07C309/40C07C309/47C07C309/50
Inventor 陈小勇陈九亦
Owner JIANGSU JIHUA CHEMICAL CO LTD
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