Process for isomerising xylenes

Details Process for isomerising xylenes Process for isomerising xylenes

C - Chemistry, Metallurgy

07

C

260/689.5

C07C 15/08 (2006.01) B01J 29/40 (2006.01) C07C 4/12 (2006.01) C07C 4/18 (2006.01) C07C 5/27 (2006.01) C10G 59/02 (2006.01) C10G 63/04 (2006.01)

Patent

CA 1147353

-32- PROCESS FOR ISOMERISING XYLENES ABSTRACT Isomerization of xylenes admixed with other alkyl aromatics of at least eight carbon atoms, particularly ethylbenzene, is conducted at essentially atmospheric pressure at 800-1000°F. with a zeolite such as zeolite ZSM-5 the acid activity of which has been reduced. The operating conditions prescribed, in combination with the reduction of activity of the zeolite, permit replacement by a catalyst containing a zeolite such as ZSM-5 of amorphous silica-alumina catalyst widely used in existing isomerization plants, with great increase in the effectiveness of such plants' operation. Substantially the sole by-products resulting from operation in accordance with the invention are benzene and toluene.

352418

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