Method for the manufacture of pyromellitic acid dianhydride

Details Method for the manufacture of pyromellitic acid dianhydride Method for the manufacture of pyromellitic acid dianhydride

1985-03-28

1986-07-01

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30791

Patent

active

045981574

ABSTRACT:
A method of separating pyromellitic acid dianhydride from the reaction gas obtained from the gas phase oxidation of 1,2,4,5-tetraalkylbenzene with an oxygen bearing gas in a closed gas circulatory system, comprising, (a) desublimating pyromellitic acid dianhydride by contacting the product gas obtained from said gas phase oxidation reaction with a cold, oxygen bearing gas, (b) catalytically burning the byproducts in the waste gas obtained from the desublimation step, and (c) recirculating a proportionate amount of the byproduct free waste gas to the oxidation reactor for the gas phase oxidation reaction.

REFERENCES:
patent: 4119645 (1978-10-01), Auroy et al.
patent: 4252772 (1981-02-01), Way
patent: 4435581 (1984-03-01), Miserlis

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