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US 2024/0076565 A1Published application
Method for producing high quality base oils using multiple stage processing
AssigneeChevron U.S.A. Inc.
InventorsYihua ZHANG, Guan-Dao LEI
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Abstract
Described are processes to produce base oils with one more improved properties, e.g., lower aromatics, economically and/or efficiently. In some embodiments the processes comprise a step that reduces the amount of residual refractory sulfur compounds prior to or simultaneous with a hydrofinishing step which advantageously provides base oils with lower aromatics than comparable processes.
Claims20
A process for producing a low aromatic base oil comprising:
- contacting a first SSZ-91 isomerized stream comprising an amount of residual refractory sulfur compounds with a base metal catalyst comprising nickel under conditions to provide a second isomerized stream comprising a lesser amount of residual refractory sulfur compounds than the first isomerized stream;
- and
- contacting the second isomerized stream with a noble metal hydrofinishing catalyst under hydrofinishing conditions to provide a hydrofinished stream.
A process for producing a low aromatic base oil comprising:
- contacting a first isomerized stream comprising an amount of residual refractory sulfur compounds with a base metal catalyst comprising nickel under conditions to provide a second isomerized stream comprising a lesser amount of residual refractory sulfur compounds than the first isomerized stream wherein the conditions comprising a temperature of from about 130° F. to about 230° F.;
- and
- contacting the second isomerized stream with a noble metal hydrofinishing catalyst comprising a silica alumina support and a noble metal selected from palladium, platinum, or a combination thereof wherein the noble metal content is from about 0.1 to about 1.0 wt. % under hydrofinishing conditions to provide a hydrofinished stream wherein the hydrofinishing conditions comprise a pressure in the range from about 15 to about 3000 psig and a of from about 350° F. to about 500° F.;
- wherein a base oil produced by the process comprises less than 0.4% by weight aromatics.
1 more element
Dependencies are inferred from the claim text.