A kind of preparation method of naphthol as

A chromophenol and process technology, applied in the preparation field of chromophenol AS, can solve the problems of poor dispersibility of the reaction system, incomplete reaction, long condensation time, etc., and achieve the effects of improving yield and quality, thorough reaction and good product quality.

Active Publication Date: 2016-06-15
JINING SUNSHINE CHEM
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Problems solved by technology

[0003] The purpose of the present invention is to solve technical problems such as low yield and poor quality caused by long condensation time, poor dispersion of the reaction system, and incomplete reaction in the preparation process of naphthol AS products, and to provide a relatively complete naphthol AS preparation method

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  • A kind of preparation method of naphthol as
  • A kind of preparation method of naphthol as

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Embodiment Construction

[0021] The technical solution of the present invention is further illustrated below through specific examples.

[0022] Specific embodiments of the present invention: since the naphthol AS is condensed in an anhydrous state of an organic solvent, it is necessary to ensure that there is no water in the reaction system before it can be operated, that is, to ensure that chlorobenzene, amino, 2-hydroxyl-3- Naphthoic acid cannot be damp and wet, and aniline cannot be water-containing and discolored; wear labor protection supplies and conduct detailed inspections on equipment and other aspects, and follow-up operations can only be performed after confirming that there is no problem.

[0023] 1) First check that there is no water in the suspension pot, open the solvent feed valve and add 5000L of chlorobenzene and 2000L of o-chlorotoluene that has been screened;

[0024] 2) Turn on and stir to mix evenly, then add 1200kg of 2-hydroxy-3-naphthoic acid and 12kg of screened oil-soluble ...

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Abstract

The invention relates to a preparation method of naphthol AS. The method comprises a condensation process, an alkali cooking process, a filtration process, a drying process and a tail gas recycling process, wherein the condensation process comprises the following steps: 1) adding chlorobenzene and an organic solvent into a suspension pot; 2) after stirring and mixing, adding 2-hydroxy-3-naphthoic acid and an oil soluble ionic dispersant, stirring and adding aniline into the suspension pot; 3) filling materials in the suspension pot into a condensation reaction kettle and dropwise adding mixed liquid of phosphorus trichloride; 4) after the completion of dropwise adding of the mixed liquid of the phosphorus trichloride, heating with steam to obtain condensation materials. The preparation method of the naphthol AS provided by the invention has the benefits that a produced naphthol AS product has good quality and high yield; as the oil soluble ionic dispersant and the organic solvent are added in the condensation process, the dispersion of particles in suspension liquid is more uniform, and the coagulation phenomena cannot occur, so that the condensation process reaction is complete, the time of the condensation process is shortened, and the economic benefit is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of naphthol AS. Background technique [0002] Naphthol AS is an important dye intermediate, mainly used in the production of organic pigments and dyeing and printing of cotton fibers, viscose fibers and some synthetic fibers; it is 2-hydroxy-3-naphthoic acid and aniline in In chlorobenzene solution, phosphorus trichloride is used as a catalyst to carry out condensation reaction. The finished product is usually beige or reddish, with a content of about 98%, which can meet the requirements of various quality standards. Quality, especially the appearance of the product is high, so the products made by direct condensation often cannot meet the requirements of domestic users and foreign trade exports, and also affect its application and sales, so improve the appearance of the product, increase the content, and produce high-quality High-quali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C235/66C07C231/02C01B7/07B01D53/18
Inventor 白林海付晓梅王慧
Owner JINING SUNSHINE CHEM
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