Chevron Research Company

Hazel C Olbrich

Dennis John O'Rear

John A Zakarian

A highly efficient process for producing olefins using intermediate pore size zeolites is disclosed. The use of a specific range of silica:alumina mole ratios (175:1 to about 300:1) at pressure over 30 psia has been found to decrease catalyst deactivation rates for these intermediate pore size catalysts.

Process for preparing olefins at high pressure

A desulfurizing and dewaxing process which can be performed in a single reaction vessel is disclosed. The desired lowering of oil partial pressure for dewaxing zone is accomplished by adding diluent gas to the HDS-zone effluent, thus obviating the need for other means to maintain differing oil partial pressures between serial catalyst zones.

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Rodeo, CA, United States of America

Hazel C Olbrich