P-n-p ligand
AssigneeNOVA Chemicals (International) S.A.
InventorsXiaoliang Gao, Peter Zoricak
Life of this patent
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Abstract
A new P-N-P ligand is useful in ethylene oligomerizations. In combination with i) a source of chromium; and ii) an activator such as methylalumoxane; the ligand of this invention may be used to prepare an oligomer product that contains a mixture of high purity alpha olefins. In a preferred embodiment, the ligand of this invention enables a selective oligomerization in which the majority of the liquid product is a mixture of hexene and octene. The amount of by-product polymer that is produced in preferred oligomerization reactions is advantageously low.
Claims12
A ligand defined by the formula:
- wherein Ar1 is selected from the group consisting of aromatic hydrocarbyl and aromatic heterohydrocarbyl;
- ArFis an aromatic fluorocarbyl oxide;
- Ar3 and Ar4 are independently selected from the group consisting of aromatic hydrocarbyl;
- aromatic heterohydrocarbyl and aromatic fluorocarbyl oxide;
- and R1 is selected from the group consisting of hydrocarbyl and heterohydrocarbyl.
A process for the oligomerization of ethylene, wherein said process comprises contacting ethylene under oligomerization conditions with a catalyst system comprising
- i) a source of chromium;
- ii) a ligand defined by the formula
- wherein Ar1 is selected from the group consisting of aromatic hydrocarbyl and aromatic heterohydrocarbyl;
- ArFis an aromatic fluorocarbyl oxide;
- Ar3 and Ar4 are independently selected from the group consisting of aromatic hydrocarbyl;
- aromatic heterohydrocarbyl and aromatic fluorocarbyl oxide;
- and R1 is selected from the group consisting of hydrocarbyl and heterohydrocarbyl;
- and
- iii) an activator.
The molecule:
Dependencies are inferred from the claim text.