Title:
METHOD OF OBTAINING PURE DICARBOXYLIC ACID* ITS ANHYDRIDE AND*OR ESTER
Document Type and Number:
Japanese Patent JPS55141432
Kind Code:
A
Abstract:
Process for isolating pure dicarboxylic acids, anhydrides and/or esters (27) from crude products (12) containing these compounds by subjecting these with gases or gas mixtures (1) which are in the supercritical state at temperatures above the critical temperature and pressures below the critical pressure of the gas or gas mixture used to an extraction (11) using the following gases or gaseous compounds not only individually but also in the form of mixtures with one another as extractants: CO2, N2O, fluoro/chlorocarbons, NH3, SO2, CH3Cl, C2H4, C2H6 and CH3OH. The process is particularly suitable for purifying the products of the air oxidation of hydrocarbons for the production of fumaric acid, maleic acid, phthalic anhydride, adipic acid, dimethyl adipate, terephthalic acid and dimethyl terephthalate.
Inventors:
FUUBERUTO KOENEN
ERUNSUTO KURIIGERU
GERUHARUTO PUROISAA
KAARU SHIYUMITO
MARUCHIN SHIYURUTSU
RORUFU BUETSUTSUERU
ERUNSUTO KURIIGERU
GERUHARUTO PUROISAA
KAARU SHIYUMITO
MARUCHIN SHIYURUTSU
RORUFU BUETSUTSUERU
Application Number:
JP3480680A
Publication Date:
November 05, 1980
Filing Date:
March 21, 1980
Export Citation:
Assignee:
KRUPP KOPPERS GMBH
International Classes:
C07C51/00; C07C51/42; C07C51/43; C07C51/573; C07C55/02; C07C57/13; C07C63/15; C07C67/00; C07C69/82; C07D307/60; C07D307/89; C07C69/34; (IPC1-7): C07C51/48; C07C51/573; C07C55/02; C07C57/13; C07C63/15; C07C67/58; C07C69/34; C07C69/593; C07C69/82; C07D307/60; C07D307/77
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