Production of lubricating oils by a combination catalyst system
AssigneeExxonMobil Research and Engineering Company
InventorsDaniel Paul Leta, Stuart Leon Soled, Gary Brice McVicker, Sylvain Hantzer
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Abstract
A process for preparing a lubricating oil basestock having good low temperature properties. The process includes a first amorphous isomerization catalyst having a pore volume less than 0.99 ml/gm (H2O), an alumina content in the range of 30-50 wt % based on isomerization catalyst and an isoelectric point in the range of 4.5 to 6.5. The isomerization step is followed by a catalytic dewaxing step using an intermediate pore crystalline molecular sieve.
Claims12
A process for producing a lubricating base oil having good low temperature properties comprises:
- (a) contacting a hydrocarbon feedstock with an amorphous silica-alumina based isomerization catalyst having a pore volume less than 0.99 ml/gm (H2O), an alumina content in the range of 35-55 wt % based on silica-alumina and an isoelectric point in the range of 4.5 to 6.5, and a metal hydrogenation component in the presence of hydrogen to at least partially isomerize waxy paraffins in the hydrocarbon feedstock, forming at least a partially isomerized feedstock;
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- (b) contacting at least a portion of the at least partially isomerized feedstock with a 10 or 12 ring shape selective crystalline molecular sieve catalyst containing a metal hydrogenation component in the presence of hydrogen to at least partially catalytically dewax the feedstock from step (a).
A process for producing a lubricating base oil having good low temperature properties comprises:
- (a) contacting a hydrocarbon feedstock with an amorphous silica-alumina based isomerization catalyst having a pore volume less than 0.99 ml/gm (H2O), an alumina content in the range of 35-55 wt % based on silica-alumina wherein the silica-alumina is modified with a rare earth oxide or yttria or boria or magnesia and has an isoelectric point greater than but no more than 2 points greater than that of the base silica-alumina, and a metal hydrogenation component in the presence of hydrogen to at least partially isomerize waxy paraffins in the hydrocarbon feedstock, forming at least a partially isomerized feedstock;
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- (b) contacting at least a portion of the at least partially isomerized feedstock with a 10 or 12 ring shape selective crystalline molecular sieve catalyst containing a metal hydrogenation component in the presence of hydrogen to at least partially catalytically dewax the feedstock from step (a).
Dependencies are inferred from the claim text.