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Patent Searching and Data


Title:
METHOD FOR PREPARING HYDROXYBENZOIC ANHYDRIDE
Document Type and Number:
WIPO Patent Application WO/2018/039845
Kind Code:
A1
Abstract:
Provided is a method for preparing hydroxybenzoic anhydride. Benzoic acid and acetic anhydride are put in a container, a reaction mixture is slowly distilled to obtain a pure hydroxybenzoic anhydride product, and a mother liquor with a melting point of 50ºC is concentrated in a water bath and recrystallized again, so that a pure product is obtained. The advantages lie in that the preparation method using benzoic anhydride is simple and easy to implement, convenient to operate, the raw materials are readily available, the equipment is common, the cycle is short and the purity is high.

Inventors:
SHEN JIANMEI (CN)
Application Number:
CN2016/097106
Publication Date:
March 08, 2018
Filing Date:
August 29, 2016
Export Citation:
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Assignee:
SHEN JIANMEI (CN)
International Classes:
C07C51/56; C07C63/06
Foreign References:
CN104130121A2014-11-05
CN1249737A2000-04-05
CN1222131A1999-07-07
Other References:
ZHANG GUANLI ET AL.: "The synthesis of 4-cyan-o-phthalic anhydride", NEW CHEMICAL MATERIALS, vol. 7, no. 30, 31 July 2002 (2002-07-31), pages 34 - 35
Attorney, Agent or Firm:
BEIJING YIGE INTELLECTUAL PROPERTY AGENT LTD (GENERAL PARTNERSHIP) (CN)
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