C2-C5 olefin oligomerization by reduced chromium catalysis
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United States of America Patent
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Feb 5, 1991
Grant Date -
N/A
app pub date -
Apr 28, 1989
filing date -
Apr 28, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is disclosed for the oligomerization of C.sub.2 -C.sub.5 alpha olefin mixtures or C.sub.3 -C.sub.5 alpha-olefins alone to produce novel lubricant range products having high viscosity index and regio-regularity not greater than 40%. Lower hydrocarbon fractions useful as gasoline and distillate fuels are also produced. The process comprises contacting said mixtures or C.sub.3 -C.sub.5 alpha-olefins with a reduced valence state chromium oxide catalyst on a silica support in an oligomerization zone under oligomerization conditions comprising a temperature from 90.degree. C. to 250.degree. C. The process can be carried out in dilute form using an inert solvent such as octane. The lubricant products can be produced in wide range of viscosities including the direct production of low viscosity lubricants having high viscosity index.
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