SEPARATION OF P-HYDROXYBENZOIC ACID ALKALI SALT

PURPOSE:To easily separate the subject compound in high purity without generating emulsion by reacting a phenol alkali with carbon dioxide and washing the reaction product with a specific oxygen-containing compound other than carboxylic acid. CONSTITUTION:A p-hydroxybenzoic acid alkali salt useful a...

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Bibliographic Details
Main Authors IJIRI MAKIKO, SUZUKI TOSHINOBU, MATSUURA AKINORI, SAIMA HITOSHI
Format Patent
LanguageEnglish
Published 09.05.1991
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:PURPOSE:To easily separate the subject compound in high purity without generating emulsion by reacting a phenol alkali with carbon dioxide and washing the reaction product with a specific oxygen-containing compound other than carboxylic acid. CONSTITUTION:A p-hydroxybenzoic acid alkali salt useful as an intermediate for liquid crystal resin or pharmaceuticals is produced by the Kolbe-Schmitt reaction of a phenol alkali or a mixture containing the compound and carbon dioxide. The reaction product is washed with >=0.1 pts.wt., preferably 1-100 pts.wt. (based on 1 pt.wt. of the reaction product) of a <=10C oxygen-containing compound other than carboxylic acid (e.g. acetone) to remove the reaction medium and by-produced salicylic acids and phenols at the same time from the reaction product without using a liquid-liquid separation process liable to generate an emulsion. The objective compound can be easily separated by this process in high purity.
Bibliography:Application Number: JP19890248805