High viscosity index lubricants by isoalkane alkylation
AssigneeChevron U.S.A. Inc.
InventorSven Ivar Hommeltoft
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Abstract
An isoalkane alkylate base oil and a process to make an isoalkane alkylate base oil having a VI higher than 90, comprising: a. selecting an isoalkane feed containing at least one isoalkane and an olefin feed containing at least one linear olefin such that a combined carbon number of the isoalkane feed and the olefin feed is from 20 to 60; and b. alkylating the isoalkane feed with the olefin feed in the presence of an acidic alkylation catalyst under alkylation conditions to make the isoalkane alkylate base oil having the VI higher than 90; wherein the isoalkane alkylate base oil has a kinematic viscosity at 100° C. from 2 to 30 mm2/s, a pour point less than 0° C., and a bromine index less than 2000 mg Br/100 g.
Claims23
A process to make an isoalkane alkylate base oil having a VI higher than 90, comprising:
- a. selecting an isoalkane feed containing at least one isoalkane and an olefin feed containing at least one linear olefin such that a combined carbon number of the isoalkane feed and the olefin feed (Nalkane+olefin) is from 20 to 60;
- and
- b. alkylating the at least one isoalkane with the at least one linear olefin in the presence of an acidic alkylation catalyst under alkylation conditions to make the isoalkane alkylate base oil having the VI higher than 90;
- wherein the isoalkane alkylate base oil has a kinematic viscosity at 100° C. from 2 to 30 mm2/s, a pour point less than 0° C., and a bromine index less than 2000 mg Br/100 g;
- wherein the olefin feed is introduced:
- i. over a period of 34 to 50 minutes during the alkylating;
- and
- ii. separately from the isoalkane feed during the alkylating;
- and
- wherein the bromine index is obtained prior to any subsequent optional hydrogenation.
Dependencies are inferred from the claim text.