Hydrocarbon conversion process for selectively making middle dis

Details Hydrocarbon conversion process for selectively making middle dis Hydrocarbon conversion process for selectively making middle dis

1988-05-23

1989-09-26

McFarlane, Anthony

Mineral oils: processes and products

Chemical conversion of hydrocarbons

208111, 208120, 585467, 585481, 585739, 507 79, C10G 1105, C10G 4716, C07C 522

Patent

active

048698032

ABSTRACT:
A hydrocarbon conversion catalyst useful for converting hydrocarbon feeds to midbarrel products is prepared by calcining a crystalline aluminosilicate zeolite having cracking activity in the presence of added steam at a water vapor partial pressure greater than about 2.0 p.s.i.a. under conditions such that the unit cell size of the zeolite is reduced to a value between about 24.32 and about 25.45 Angstroms while the water vapor sorptive capacity of the zeolite is decreased to a value between about 5 and about 15 weight percent of the zeolite at 25.degree. C. and a p/p.degree. value of 0.10. The moderately steam calcined zeolite is mixed with a porous, inorganic refractory oxide component and the resultant mixture is extruded to form particles which are broken into extrudates normally ranging in length between 1/16 and 1/2 inch. The extruded particles are then calcined in the presence of added steam at a water vapor partial pressure greater than about 2.0 p.s.i.a. The calcination of the extrudates is carried out in the presence of sufficient added steam for a sufficient amount of time at a sufficient temperature to convert the moderately steam calcined zeolite in the extrudates into an ultrahydrophobic zeolite having a unit cell size between about 24.20 and about 24.32 Angstroms and a sorptive capacity for water vapor less than about 5 weight percent of the zeolite at 25.degree. C. and a p/p.degree. value of 0.10.

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