Production process for pyromellitic dianhydride

Details Production process for pyromellitic dianhydride Production process for pyromellitic dianhydride

1999-03-16

2000-11-28

Dentz, Bernard

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D49304

Patent

active

061537675

ABSTRACT:
Provided is a process for producing pyromellitic dianhydride by feeding 1,2,4,5-tetraalkylbenzene to a fixed bed multitubular type reactor charged with a catalyst layer to carry out catalytic vapor phase oxidation. This process is characterized by dividing the catalyst layer into at least two layers to charge a layer at an outlet side of reaction gas and a layer at an inlet side of raw material mixed gas with the following catalyst A and catalyst B respectively or dividing the catalyst layer into at least three layers to charge a layer at an outlet side of reaction gas, an intermediate layer and a layer at an inlet side of raw material mixed gas with the following catalyst A, catalyst B and catalyst C respectively:

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Derwent Publications Ltd., London, GB; AN 1974-67211V, Aug. 27, 1974 Section CH, Week 197438 (Abstract).

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