Process and catalyst for the dewaxing of shale oil
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United States of America Patent
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Sep 19, 1989
Issued Date -
N/A
app pub date -
Jul 21, 1988
filing date -
Jun 18, 1985
priority date (Note) -
Expired
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Abstract
The pour point and/or cloud point of the lube fractions comprising a waxy hydrocarbon feedstock containing straight and branched chain paraffins is reduced by contacting the feedstock in a dewaxing zone, preferably in the presence of added hydrogen, with a dewaxing catalyst comprising (1) an intermediate pore crystalline molecular sieve having a pore size between about 5.0 Angstroms and about 7.0 Angstroms and (2) a large pore crystalline molecular sieve having a pore size above about 7.0 Angstroms and typically selected from the group consisting of silicoaluminophosphates, ferrosilicates, aluminophosphates and Y zeolites. A hydrocarbon fraction of reduced paraffin content is recovered from the effluent of the dewaxing zone. Preferred intermediate pore crystalline molecular sieves are silicalite and a ZSM-5 type zeolite. Preferred large power crystalline molecular sieves are silicoaluminophosphates such as SAPO-5 and ammonium exchanged and steamed Y zeolites.
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