Process for catalytic cracking of heavy hydrocarbon feed to ligh

Details Process for catalytic cracking of heavy hydrocarbon feed to ligh Process for catalytic cracking of heavy hydrocarbon feed to ligh

1988-12-30

1990-05-29

Mc Farlane, Anthony

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208135, 502 67, 585407, 585739, C10G 1105, C10G 35095, C07C 212, C07C 522

Patent

active

049293370

ABSTRACT:
A catalytic cracking catalyst mixture and process are disclosed. The mixture comprises (a) a cracking catalyst containing a matrix and a large pore molecular sieve and (b) separate additive catalysts comprising at least one of a shape selective paraffin cracking/isomerization zeolite and a shape selective aliphatic aromatization zeolite. An exemplary catalyst mixture comprises Dealuminized zeolite Y, optionally containing rare earth elements in an alumina-rich matrix, an additive catalyst of HZSM-5 in a matrix, and an additional additive catalyst of gallium ZSM-5 in a matrix. The alumina-rich matrix of the cracking catalyst acts as a sodium and metals sink. The large pore molecular sieve catalyst cracks large hydrocarbons to lighter paraffins and olefins. The shape selective paraffin cracking/isomerization component cracks/isomerizes the paraffins produced by the large pore molecular sieve. The shape selective aliphatic aromatization catalyst converts light paraffins and olefins into aromatics. A single shape selective zeolite, e.g., ZSM-5 with a controlled amount of an aromatization component such as gallium, may promote both paraffin cracking/isomerization and aromatization. The additive catalylsts have physical properties, e.g., size, shape, density and attrition resistance which are substantially the same as the cracking catalyst.

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