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US 12,486,465 B2Granted
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.
Claims17
A process for producing base oil comprising:
- providing a first isomerized stream comprising residual refractory sulfur compounds produced by contacting a hydrocarbon feedstock with hydrogen and a noble metal hydroisomerization catalyst under hydroisomerization dewaxing conditions to provide the isomerized stream, wherein the noble metal hydroisomerization catalyst comprises a crystalline molecular sieve SSZ-91 and platinum;
- contacting the 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;
- and
- contacting the second isomerized stream with a noble metal hydrofinishing catalyst under hydrofinishing conditions to provide a hydrofinished stream, wherein the noble metal hydrofinishing catalyst comprises a noble metal content from about 0.1 to about 1.0 wt. %.
1 more element
A process for producing base oil comprising:
- providing a first isomerized stream comprising residual refractory sulfur compounds produced by contacting a hydrocarbon feedstock with hydrogen and a noble metal hydroisomerization catalyst under hydroisomerization dewaxing conditions to provide the isomerized stream, wherein the noble metal hydroisomerization catalyst comprises a crystalline molecular sieve SSZ-91 and platinum;
- contacting the 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 temperature 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.
2 more elements
Dependencies are inferred from the claim text.