Alkylation catalyst recovery process

Details Alkylation catalyst recovery process Alkylation catalyst recovery process

C - Chemistry, Metallurgy

01

B

23/110, 252/126,

C01B 7/19 (2006.01) B01J 27/32 (2006.01) C01B 33/08 (2006.01)

Patent

CA 1063589

ABSTRACT OF THE DISCLOSURE A process for removal of fluoride compounds from spent alkylation catalyst containing fluorosulfonic acid and sulfuric acid wherein hydrogen fluoride and fluorosulfonic acid, in the presence of water, are removed by vacuum dis- tillation following which the remaining sulfuric acid rich fraction of the spent catalyst is reacted with a silica con- taining material to convert most of the remaining residual hydrogen fluoride to silicon fluoride which is volatilized from the mixture to thereby provide a sulfuric acid effluent free of substantial amounts of fluoride compounds. The hydrogen fluoride recovered is reacted with sulfur trioxide to form fresh fluorosulfonic acid which is combined with sulfuric acid to provide fresh alkylationa catalyst.

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