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US 12,577,478 B2Granted
Method for producing high quality base oils using two stage hydrofinishing
AssigneeChevron U.S.A. Inc.
InventorsYihua Zhang, Subhasis Bhattacharya, 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 relate to two stage (or more) hydrofinishing which advantageously provides base oils with lower aromatics than comparable one stage processes.
Claims18
A process for producing a low aromatic base oil comprising:
- contacting an SSZ-91 isomerized stream with a noble metal hydrofinishing catalyst under first hydrofinishing conditions to provide a first hydrofinished stream, wherein the first hydrofinishing conditions comprise a temperature in the range of 500° F. to 650° E;
- and
- contacting the first hydrofinished stream with a second noble metal hydrofinishing catalyst under second hydrofinishing conditions to provide a second hydrofinished stream, wherein the second hydrofinishing conditions comprise a temperature in the range of 370° F. to 450° F.;
- and
- wherein a base oil produced by the process comprises less than 0.9% by weight aromatics.
2 more elements
A process for producing a low aromatic base oil comprising:
- contacting a hydrocarbon feedstock with hydrogen and a catalyst comprising crystalline molecular sieve SSZ-91 and platinum under hydroisomerization dewaxing conditions to provide an isomerized stream;
- contacting the isomerized stream with a catalyst comprising a silica alumina support and a noble metal selected from palladium, platinum, or a combination thereof wherein the catalyst comprises a noble metal content from about 0.1 to about 0.6 wt. % under first hydrofinishing conditions to provide a first hydrofinished stream, wherein the first hydrofinishing conditions comprise a temperature in the range of 500° F. to 650° F.;
- and
- contacting the first hydrofinished stream with a catalyst comprising a silica alumina support and a noble metal selected from palladium, platinum, or a combination thereof wherein the catalyst comprises a noble metal content from about 0.1 to about 0.6 wt. % under second hydrofinishing conditions to provide a second hydrofinished stream, wherein the second hydrofinishing conditions comprise a temperature in the range of 370° F. to 450° F.;
- wherein a base oil produced from the process comprises less than 0.8% by weight aromatics and at least about 40% less aromatics by weight than a comparable process employing a single hydrofinishing step.
2 more elements
Dependencies are inferred from the claim text.