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

C - Chemistry, Metallurgy

07

D

260/364.8

C07D 493/04 (2006.01) C07C 51/265 (2006.01)

Patent

CA 1221099

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

483294

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