Tetramerization of olefins
AssigneeSasol Technology (Pty) Ltd
InventorsKevin Blann, Annette Bollmann, John Thomas Dixon, Arno Neveling, David Hedley Morgan, Hulisani Maumela, Esna Killian, Fiona Millicent Hess, Stefanus Otto, Matthew James Overett, Michael James Green
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Abstract
The invention describes a process for tetramerisation of olefins wherein the product stream of the process contains more than 30% of the tetramer olefin. The process includes the step of contacting an olefinic feedstream with a catalyst system containing a transition metal compound and a heteroatomic ligand.
Claims57
A process for the oligomerisation of olefins comprising contacting an olefinic feedstream with a catalyst system which includes the combination of:
- a transition metal compound;
- and
- a heteroatomic ligand described by the following general formula
- (R)nA-B—C(R)m
- where
- A and C are independently an atom selected from the group consisting of phosphorus, arsenic, antimony, oxygen, bismuth, sulphur, selenium and nitrogen or said atom oxidized by S, Se, N or O, where the valance of A and/or C allows for such oxidation;
- B is a linking group between A and C;
- the R groups are the same or different and each R is independently selected from a homo hydrocarbyl group and a heterohydrocarbyl group, and at least one R has a polar substituent;
- and
- n and m for each R is independently determined by the respective valence and oxidation state of A and C;
- and
- provided that when the heteroatomic ligand is described by the following general formula
- (R1)(R2)A-B—C(R3)(R4)
- wherein
- A and C are independently selected from the group consisting of phosphorus, arsenic, antimony, bismuth and nitrogen;
- B is a linking group between A and C;
- and
- each of R1, R2, R3 and R4 is independently selected from the group consisting of a non-aromatic group, an aromatic group, and a heteroaromatic group;
- at least one of R1, R2, R3 and R4, if aromatic, has a polar substituent on a 2nd or further atom from the atom bound to A or C and provided that any polar substituents that R1, R2, R3 and R4 may have, if they are aromatic, are not on the atom adjacent to the atom bound to A or C.
A tetramerisation catalyst system comprising:
- a transition metal compound;
- and
- a heteroatomic ligand described by the following general formula
- (R)nA-B—C(R)m
- where
- A and C are independently an atom selected from the group consisting of phosphorus, arsenic, antimony, oxygen, bismuth, sulphur, selenium and nitrogen or said atom oxidized by S, Se, N or O, where the valance of A and/or C allows for such oxidation;
- B is a linking group between A and C;
- the R groups are the same or different and each R is independently selected from a homo hydrocarbyl group and a heterohydrocarbyl group, and at least one R has a polar substituent;
- and
- n and m for each R is independently determined by the respective valence and oxidation state of A and C;
- and
- provided that when the heteroatomic ligand is described by the following general formula
- (R1)(R2)A-B—C(R3)(R4)
- wherein
- A and C are independently selected from the group consisting of phosphorus, arsenic, antimony, bismuth and nitrogen;
- B is a linking group between A and C;
- and
- each of R1, R2, R3 and R4 is independently selected from the group consisting of a non-aromatic group, an aromatic group, and a heteroaromatic group;
- at least one of R1, R2, R3 and R4, if aromatic, has a polar substituent on a 2nd or further atom from the atom bound to A or C and provided that any polar substituents that R1, R2, R3 and R4 may have, if they are aromatic, are not on the atom adjacent to the atom bound to A or C.
Dependencies are inferred from the claim text.