What is H acid?

2010-12-02View Original

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This post was last edited by Litaotao1314 on 2010-12-3 09:54. What is H acid? What are the chemical properties? Production process? The raw material for H acid is 65 93 100 acid

Reply #22010-12-03

H-acid is 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid. It is an important intermediate in the production of azo dyes. H-acid products are generally in paste or powder form. It is prepared by heating the disodium salt of Koch’s acid (1-naphthylamine-3,6,8-trisulfonic acid) with a concentrated solution of caustic soda in an autoclave at about 180–190°C to melt it, then dissolving the melt in water and subsequently precipitating it through acidification.

Reply #32014-07-22

I have a question regarding the corrosion issues caused by H acid

Reply #42014-08-12

There are several chemical formulas for H acid; which one is actually H acid, or are they all H acid? 　

Reply #52016-05-09

Sodium 1-amino-8-naphthol-3,6-disulfonate

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What is H acid?

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