Wax hydroisomerization process
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United States of America Patent
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-
May 7, 2002
Grant Date -
N/A
app pub date -
Nov 14, 2000
filing date -
Feb 13, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Waxy feeds are treated under hydroisomerization conditions to produce good yields of an isomerate product of high VI by using a silica-alumina based catalyst in which the silica-alumina has a pore volume less of 0.99 ml/gm (H.sub.2 O), an alumina content in the range of 35 to 55 wt % and an isoelectric point in the range of 4.5 to 6.5. A lube fraction of the isomerate is dewaxed to provide a lube basestock of high VI. The silica-alumina may be modified with a rare earth oxide or yttria or boria or magnesia in which instance the modified catalyst has an isoelectric point greater than but no more than 2 points greater than base the silica-alumina.
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