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Method for preparing 2-amino-5-naphthol-1,7-disulphonic acid

A technology of disulfonic acid and naphthalenesulfonic acid, which is applied in the preparation of sulfonic acid and organic chemistry, and can solve the problems of equipment corrosion, high consumption, and low purity

Inactive Publication Date: 2010-07-14
太仓市华联化工实业有限公司
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Problems solved by technology

But these two methods will consume a large amount of acid and alkali, and due to the use of a large amount of acid or alkali, the corrosion of equipment is serious
And adopt manganese dioxide and sodium bisulfite or sulfur dioxide to replace fuming sulfuric acid to carry out the preparation method of sulfonating J acid though solved the corrosion problem of equipment, but the content (amino value) of the product prepared by this method can only reach 40% , lower purity

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  • Method for preparing 2-amino-5-naphthol-1,7-disulphonic acid

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Embodiment Construction

[0012] The specific embodiment of the present invention is described below:

[0013] Preparation of 10% alkaline solution of J acid: 1340 kg of water, heated to 45°C, stirred, added 144 kg of J acid, after 30 minutes, added 86-87 kg of 30% sodium hydroxide solution, adjusted pH 6.5- 8. Make it all dissolve, and the dark solution is 10% alkaline solution of J acid.

[0014] Add 150 kilograms of manganese dioxide (75%) in the alkaline solution of 10% J acid that has been configured, stir and add 315 kilograms of sodium metabisulfite with the speed of 105 kilograms / hour after being heated to 45-50 ℃, and in After the addition was complete, the reaction was continued for 30 minutes, and then the reaction was stopped, filtered, and the filtrate was retained.

[0015] 560 kg of 30% hydrochloric acid was slowly added to the above filtrate, and the pH of the solution was 1-2 at this time. Then heat it to 60°C, blow in air to drive away the sulfur dioxide, after 3-4 hours, cool the s...

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Abstract

The present invention relates to 2-amino-5-naphthol-1, 7-disulfonic acid preparing process. The main material 7-amino-4-hydroxy-2-naphthalene sulfonic acid is first compounded into alkaline solution of 9-11 wt% concentration and pH 6-8, and then added with manganese dioxide and sodium pyrosulfite to produce sulfonation reaction at 40-55 deg.c temperature and pH 6.5-8 for 0.5-1 hr to produce 2-amino-5-naphthol-1, 7-disulfonic acid. Thus prepared 2-amino-5-naphthol-1, 7-disulfonic acid product has purity higher than 96 %.

Description

technical field [0001] The invention relates to a preparation method of 2-amino-5 naphthol-1,7-disulfonic acid. Background technique [0002] 2-Amino-5-naphthol-1,7-disulfonic acid (sulfonated J acid) is an intermediate for the manufacture of new dyes. Its structural formula is as follows: [0003] [0004] The preparation method of traditional sulfonated J acid is to carry out alkali fusion with 2-naphthylamine-1,5,7-trisulfonic acid and sodium hydroxide or use 7-amino-4-hydroxyl-2-naphthalenesulfonic acid (J acid ) and 65% oleum for sulfonation reaction. But these two kinds of methods all will consume a large amount of acid and alkali, and because use a large amount of acid or alkali, the corrosion of equipment is serious. And adopt manganese dioxide and sodium bisulfite or sulfur dioxide to replace fuming sulfuric acid to carry out the preparation method of sulfonating J acid though solved the corrosion problem of equipment, but the content (amino value) of the prod...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/50C07C303/02
Inventor 沈云汉
Owner 太仓市华联化工实业有限公司
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