Addition of shape selective zeolites to catalytic cracking units

Details Addition of shape selective zeolites to catalytic cracking units Addition of shape selective zeolites to catalytic cracking units

1988-12-12

1990-05-22

McFarlane, Anthony

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208152, 208153, 502 67, 502 71, C10G 1105, C10G 1118

Patent

active

049275232

ABSTRACT:
Shape selective zeolites, such as ZSM-5, are added to the equilibrium catalyst in a catalytic cracking unit in large amounts. Sufficient fresh zeolite is added to result in an unacceptable increase in production of wet gas (C.sub.3 /C.sub.4) by the catalytic cracking unit, if operated at normal charge rates and operating conditions. To compensate, conditions in the catalytic cracking unit are adjusted, such as by reducing feed rate, catalyst/oil ratio, or cracking reaction temperature, to reduce the production of "light ends" to an amount which can be tolerated by the catalytic cracking unit. Within a few days to a few weeks, excessive production of wet gas will diminish so that unit operation may be returned to normal. Resumption of normal cracking operations using a catalyst inventory containing a relatively large amount of shape selective zeolite additive results in significant increases in the octane number of the catalytically cracked gasoline.

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