Synthesis process of isatoic anhydride

A synthesis process, the technology of isatoic anhydride, applied in the field of synthesis of isatoic anhydride, can solve the problems of low yield and purity of isatoic anhydride, increase of production cost, etc.
CN104402840AActive Publication Date: 2015-03-11甘肃西部鑫宇化学有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
甘肃西部鑫宇化学有限公司
Publication Date
2015-03-11

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Abstract

The invention provides a synthesis process of isatoic anhydride. The synthesis process comprises the following steps: a) heating phthalic anhydride until phthalic anhydride is molten and mixing the molten phthalic anhydride with urea, and cooling to 10-20 DEG C after a reaction; b) mixing reaction products obtained after cooling with liquid alkali, cooling to minus 5- 0 DEG C to carry out a first reaction, mixing reaction products with pypocholoride, mixing reaction products with hydrochloric acid after a second reaction, and carrying out a third reaction to obtain isatoic anhydride. During the synthesis process of isatoic anhydride, reaction temperature is controlled strictly. Thus, generation of by-products is avoided, and yield of isatoic anhydride is raised. Meanwhile, by one kettle way for synthesis of isatoic anhydride, industrial operations are minimized, the discharging link is reduced, and yield is raised. It shows through experimental results that yield of isatoic anhydride reaches more than 94% and purity reaches more than 99%.
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Description

technical field

[0001] The invention relates to the technical field of fine chemical production technology, in particular to a synthesis technology of isatoic anhydride. Background technique

[0002] Isatoic anhydride (C 8 h 5 NO 3 ) is an important chemical intermediate, which can react with both electrophile and nucleophile. Isatoic anhydride and its homologues and derivatives are widely used in the synthesis of agricultural chemicals, dyes, pigments, fragrances, flavors, medicines, ultraviolet absorbers, foaming agents, flame retardants, preservatives, bleaching agents, fungicides and Sanitary disinfectants and other fine chemical products.

[0003] The traditional synthesis process of isatoic anhydride is to use phthalic anhydride and urea raw materials, and the phthalimide prepared by the reaction of phthalic anhydride and urea is discharged and then dried, and then the dry phthalimide is used as raw material, and its dissolved Afterwards, it is oxidized with sodiu...

Claims

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