Catalyst System And Process Using SSZ-91 And SSZ-95
AssigneeChevron U.S.A. Inc.
InventorsYihua ZHANG, Guan Dao LEI
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Abstract
An improved hydroisomerization catalyst system and process for making a base oil product using a combined catalyst system comprising SSZ-91 molecular sieve and SSZ-95 molecular sieve. The catalyst system and process generally involves the use of a catalyst comprising an SSZ-91 molecular sieve and a separate catalyst comprising an SSZ-95 molecular sieve to produce dewaxed base oil products by sequentially contacting the catalysts with a hydrocarbon feedstock. The catalyst system and process provide improved base oil yield along with other beneficial base oil properties.
Claims20
A hydroisomerization catalyst system, useful to make dewaxed products including base oils, comprising
- a first catalyst composition comprising an SSZ-91 molecular sieve;
- and
- a second catalyst composition comprising an SSZ-95 molecular sieve;
- wherein, the first catalyst and the second catalyst compositions are arranged such that a hydrocarbon
- feedstock may be sequentially contacted with either the first or the second catalyst composition
- to provide a first product followed by contacting the first product with the other catalyst
- composition to provide a second product.
Dependencies are inferred from the claim text.