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Method for preparing 2-amino-1-naphthalene sulfonic acid

A technology of naphthalenesulfonic acid and amino, which is applied in the field of preparation of 2-amino-1-naphthalenesulfonic acid, can solve problems such as ammoniated side reactions, and achieve the effects of high reaction efficiency, high purity, and high product yield

Inactive Publication Date: 2015-11-04
广州威杰生物科技股份有限公司
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AI Technical Summary

Problems solved by technology

Since the raw material 2-naphthol cannot be completely reacted in the production method, side reactions are prone to occur during ammoniation
At the same time, due to the partial hydrolysis of the sulfonic acid group in the tunic acid molecule, the industrial products contain a certain amount of highly toxic and carcinogenic 2-naphthylamine impurities.

Method used

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  • Method for preparing 2-amino-1-naphthalene sulfonic acid

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Embodiment Construction

[0012] Such as figure 1 Shown a kind of method for preparing 2-amino-1-naphthalenesulfonic acid, the method comprises raw material reaction tower 1, the first separation reaction tower 2, condensation reaction tower 3, subtemperature reaction tower 4, precipitation reaction tower 5, fractionation Reaction tower 6, first synthesis reaction tower 7, neutralization reaction tower 8, second separation reaction tower 9, distillation reaction tower 10, second synthesis reaction tower 11, acidification reaction tower 12, dehydration reaction tower 13, wastewater treatment method 14 , hydrogen chloride gas storage tank 15, hydrogen chloride liquid storage tank 16, ammonia gas storage tank 17, ammonium sulfate liquid storage tank 18, sodium sulfate liquid storage tank 19, 2-naphthol storage tank 20, finished product storage tank 21, xylene storage Tank 22; wherein, the gas outlet of the hydrogen chloride gas storage bottle 15 is connected to the gas inlet 1 of the raw material reaction...

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Abstract

The invention discloses a method for preparing 2-amino-1-naphthalene sulfonic acid. According to the method, by using dried hydrogen chloride gas, m-xylene and 2-naphthol as raw materials, the obtained purity is high in purity which is over 96.3%. The product is white to light pink powder, wherein the total amine value (based on dry product) is over 98.5%, the content of 2-naphthylamine is less than 0.01%, the content of water is lower than 1.0% and the content of isomers is less than 1%. The method is high in reaction efficiency and short in production period and has a good market prospect.

Description

technical field [0001] The invention relates to a method for preparing 2-amino-1-naphthalenesulfonic acid, which belongs to the field of chemical industry. Background technique [0002] The chemical name of Tuccinic acid is 2-amino-1-naphthalenesulfonic acid. The synthesis method of Tuo's acid is to use 2-naphthol as raw material, 2-naphthol is used as sulfonating agent in o-nitroethylbenzene solution with chlorosulfonic acid, and the sulfonation first generates 2-teaphenol-1-sulfonic acid. Alkaline neutralization and separation to obtain 2-naphthol-1-sodium sulfonate, and then ammonolysis with ammonia water in the presence of acidic bisulfite to obtain 2-naphthylamine-1-sodium sulfonate, which was acidified with hydrochloric acid, filtered and separated to obtain acid. Since the raw material 2-naphthol cannot be completely reacted in the production method, side reactions are prone to occur during ammoniation. At the same time, due to the partial hydrolysis of the sulfoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/47C07C303/22
Inventor 金双蕾
Owner 广州威杰生物科技股份有限公司
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