Process to Produce Improved Poly Alpha Olefin Compositions
AssigneeExxonMobil Chemical Patents Inc.
InventorsCraig J. Emett, Mark P. Hagemeister, Bruce A. Harrington, Chon Y. Lin, Phillip T. Matsunaga, Charles J. Ruff, Kevin B. Stavens
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Abstract
This invention is directed to a two-step process for the preparation of improved poly alpha olefins wherein the first step involves oligomerizing low molecular weight linear alpha olefins in the presence of a single site catalyst and the second step involves oligomerization of at least a portion of the product from the first step in the presence of an oligomerization catalyst. The dimer product from the first oligomerization is characterized by a tri-substituted vinylene olefin content of at least 25 wt %.
Claims19
A process to produce a poly alpha olefin, the process comprising:
- a) contacting a catalyst, an activator, and a monomer in a first reactor to obtain a first reactor effluent, the effluent comprising a dimer product, a trimer product, and optionally a higher oligomer product,
- b) feeding at least a portion of the dimer product to a second reactor,
- c) contacting said dimer product with a second catalyst, a second activator, and optionally a second monomer in the second reactor, and
- d) obtaining a second reactor effluent,
- wherein the dimer product of the first reactor effluent contains at least 25 wt % of tri-substituted vinylene represented by the following structure:
- wherein the dashed line represents the two possible locations where the unsaturated double bond may be located and Rx and Ry are independently selected from a C3 to C21 alkyl group.
Dependencies are inferred from the claim text.