System for industrial preparation of 2-amino-5-naphtol7-sulfoacid

Abstract

The invention discloses a system for industrial preparation of 2-amino-5-naphtol7-sulfoacid. The system comprises a first synthesis reaction still, a second synthesis reaction still, a hydrolyzation reaction still, a regulation reaction still, a dissolution reaction still, a suction filtration reaction still, a concentration reaction still, a third synthesis reaction still, an acidification reaction still, a centrifugation reaction still, a drying reaction still, a finished product storage tank, a sewage treatment system, a Tobias acid liquid storage tank, a sulfur trioxide gas storage bottle, a concentrated sulfuric acid liquid storage tank, a sodium hydroxide solid storage tank, a hydrochloric acid liquid storage tank and a pure water storage pool. The 2-amino-5-naphtol7-sulfoacid prepared through the system is high in purity, the purity is over 92.8%, the water content is lower than 1%, the crystallizing rate is smaller than 0.5%, and free acid is smaller than 5%.

Description

technical field [0001] The invention relates to a system for industrially preparing 2-amino-5-naphthol-7-sulfonic acid, which belongs to the field of chemical industry. Background technique [0002] J acid is an azo dye intermediate used in the production of wool, silk and cotton dyeing. Since the industrial production, along with the development of the dye industry, great progress has been made in J acid production technology, production scale and application range at home and abroad. The chemical name of J acid is 2-amino-5-naphthol-7-sulfonic acid. Its dry product is off-white powder. It has low solubility in water and is easily soluble in alkali to make corresponding salt. Its sodium salt solution has blue fluorescence . The chlorine-containing compound of J acid is a yellow needle-like crystal, soluble in water, and can be self-coupled into a purple dye in a sodium carbonate solution. This product is mainly used in the preparation of direct dyes, reactive dyes, etc. ...

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Problems solved by technology

[0003] At present, most of the traditional methods are used to prepare J acid in China. The product has many impurities and low yield, and discharges a large amount of high-concentration waste acid, which is difficult to treat and seriously pollutes the environment.

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