Manufacture of lower aromatic compounds

Details Manufacture of lower aromatic compounds Manufacture of lower aromatic compounds

1974-08-26

1976-03-23

Levine, Herbert

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Reforming

208 64, 208 92, 208135, 260676R, 260672R, C10G 3506, C07C 358

Patent

active

039459136

ABSTRACT:
Certain acidic heterogeneous catalysts produce large yields of benzene, toluene and xylene from alkyl aromatics of at least nine carbon atoms by a mechanism different from the classical disproportionation reaction characteristic of acid catalysts. These catalysts are characterized by a zeolite of the ZSM-5 type or zeolite ZSM-12 or zeolite ZSM-21. The reaction has the unique function of providing aliphatic by-products of higher molecular weight than is to be expected by splitting side chains from benzene rings. Typically, aromatic mixtures so derived from such charge stocks have unusually low content of ethyl benzene, thus greatly simplifying separation of xylene isomers.

REFERENCES:
patent: 3304340 (1967-02-01), Noll
patent: 3759821 (1973-09-01), Brennan et al.
patent: 3761389 (1973-09-01), Rollman
patent: 3790471 (1974-02-01), Argauer et al.
patent: 3856872 (1974-12-01), Morrison
patent: 3862254 (1975-01-01), Eisenlohr et al.
patent: 3873439 (1975-03-01), Pollitzer

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