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AssigneeMobil Oil Corporation
InventorsQuang N. Le, Robert T. Thomson
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A process for naphtha cracking employing new synthetic catalyst of ultra-large pore crystalline material. The new crystalline material exhibits unusually large sorption capacity demonstrated by its benzene adsorption capacity of greater than about 15 grams benzene/100 grams at 50 torr and 25.degree. C., a hexagonal electron diffraction pattern that can be indexed with a d.sub.100 value greater than about 18 Angstrom Units and a hexagonal arrangement of uniformly sized pores with a maximum perpendicular cross section of at least about 13 Angstrom units. An improved cracking reaction is provided for catalytic conversion of hydrocarbon feedstock which comprises contacting the feedstock under catalytic conversion conditions with acid metallosilicate solid catalyst having the structure of MCM-41 with hexagonal honeycomb lattice structure consisting essentially of uniform pores in the range of about 20 to 100 Angstroms. The cracking reaction is very selective, especially when conducted at temperature of about 425.degree. to 650.degree. C.
A process for cracking paraffinic naphtha feedstock by contacting the feedstock with acid porous solid catalyst at elevated temperature under acid cracking conditions and low pressure, selective, partial cracking conditions effective to produce enhanced selectivity of at least 10 wt % C4-C5 isoalkene;
A process for catalytic cracking of naphtha range hydrocarbon feedstock which comprises contacting said feedstock for less than 10 seconds under low pressure partial cracking conditions effective for cracking less than 50 wt % of feedstock hydrocarbons and to produce at least 20 wt % selectivity to isomeric C4-C5 aliphatics containing C4-C5 tertiary alkene and at least 10 wt % C4-C5 isoalkane with acid metallosilicate solid catalyst having the structure of MCM-14 with hexagonal honeycomb lattice structure consisting essentially of uniform pores in the range of 20 to 100 Angstroms to produce branched C4-C5 hydrocarbons.
A process for upgrading paraffinic naphtha to high octane fuel comprising:
A process for upgrading paraffinic naphtha to high octane fuel by contacting a fresh virgin naphtha feedstock stream containing predominantly C7-C12 paraffins with acid MCM-41 cracking catalyst under low pressure, short contact time, selective, partial cracking conditions at pressure less than 175 kPa, reaction temperature of 425.degree. to 650.degree. C. and effective to produce at least 10 wt % selectivity to C4-C5 isoalkene.
A process for catalytic cracking of naphtha feedstock which comprises contacting feedstock containing at least 20 wt % C7-C12 alkanes under catalytic reaction conditions with inorganic, porous, non-layered crystalline phase catalyst material exhibiting, after calcination, an X-ray diffraction pattern with at least one peak at a d-spacing greater than 18 Angstrom units and having a benzene adsorption capacity greater than 15 grams of benzene per 100 grams of said material at 50 torr and 25.degree. C. said catalyst material having active Bronsted acid sites;
Dependencies are inferred from the claim text.