CONTINUOUS PRODUCTION OF OXALIC ACID ARYL ESTER

PROBLEM TO BE SOLVED: To provide an industrially suitable process for the continuous production of an aryl oxalate. SOLUTION: Raw materials (a dialkyl oxalate, an aromatic hydroxy compound and a catalyst; or an alkyl aryl oxalate and a catalyst) are continuously supplied in liquid phase into the 1st...

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Main Authors DOI TAKASHI, FUJIZU SATORU, NISHIHIRA KEIGO, TANAKA HIDEJI, HARADA KATSUMASA, NIIDA SADAO, II HIROFUMI, SUGISE RIYOUJI
Format Patent
LanguageEnglish
Published 16.06.1998
Edition6
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:PROBLEM TO BE SOLVED: To provide an industrially suitable process for the continuous production of an aryl oxalate. SOLUTION: Raw materials (a dialkyl oxalate, an aromatic hydroxy compound and a catalyst; or an alkyl aryl oxalate and a catalyst) are continuously supplied in liquid phase into the 1st reaction zone of a reactor having plural reaction zones in the liquid phase part, the reaction liquid is successively transferred from the 1st reaction zone to the subsequent reaction zone, the reaction liquid containing the objective compound is continuously extracted from the final reaction zone and, at the same time, the evaporated fraction containing by-product (aliphatic alcohol and/or dialkyl oxalate) is continuously extracted in gaseous state from the top of the reactor to perform the transesterification reaction and/or the disproportionation reaction.
Bibliography:Application Number: JP19960319214