Chromium bicyclic phosphinyl amidine complexes for tetramerization of ethylene
AssigneeChevron Phillips Chemical Company LP
InventorsSteven M. Bischof, Orson L. Sydora, Daniel H. Ess, Uriah J. Kilgore, Doo-Hyun Kwon
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Abstract
The present disclosure relates to a catalyst system comprising i) (a) an N2-phosphinyl bicyclic amidine chromium salt or (b) a chromium salt and an N2-phosphinyl bicyclic amidine and ii) an organoaluminum compound. The present disclosure also relate to a process comprising: a) contacting i) ethylene; ii) a catalyst system comprising (a) an N2-phosphinyl bicyclic amidine chromium salt complex or (b) a chromium salt and an N2-phosphinyl bicyclic amidine; ii) an organoaluminum compound, and iii) optionally an organic reaction medium; and b) forming an oligomer product in a reaction zone.
Claims24
A catalyst system comprising:
- i) (a) an N2-phosphinyl bicyclic amidine chromium salt complex having Structure NPBACr I or Structure NPBACr II
- or
- (b) a chromium salt and an N2-phosphinyl bicyclic amidine having Structure NPBA I or Structure NPBA II
- wherein
- R11, R12, R13, R14, R15, R16, R17, and R18 independently are a hydrogen or a C1 to C30 organyl group,
- L1 and L2 independently are a C1 to C30 a hydrocarbylene group,
- R4 and R5 independently are a C1 to C30 organyl group and R4 and R5 optionally are combined to form L45 forming a ring or ring system including the phosphorus atom where L45 is a C1 to C30 organylene group and wherein the compound comprises an additional cyclic structure,
- CrXp is a chromium salt wherein X is a monoanion, and wherein p is an integer from 2 to 6;
- and
- ii) an organoaluminum compound.
A process comprising:
- a) contacting
- i) ethylene,
- ii) a catalyst system comprising
- (a) (i) an N2-phosphinyl bicyclic amidine chromium salt complex having Structure NPBACr I or Structure NPBACr II
- or
- (ii) a chromium salt and an N2-phosphinyl bicyclic amidine having Structure NPBA I or Structure NPBA II
- wherein
- R11, R12, R13, R14, R15, R16, R17, and R18 independently are a hydrogen or a C1 to C30 organyl group,
- L1 and L2 independently are a C1 to C30 a hydrocarbylene group,
- R4 and R5 independently are a C1 to C30 organyl group and
- R4 and R5 optionally are combined to form L45 forming a ring or ring system including the phosphorus atom where L45 is a C1 to C30 organylene group,
- and wherein the compound comprises an additional cyclic structure;
- CrXp is a chromium salt wherein X is a monoanion, and wherein p is an integer from 2 to 6,
- (b) an organoaluminum compound, and
- iii) optionally an organic reaction medium;
- and
- b) forming an oligomer product in a reaction zone.
Dependencies are inferred from the claim text.