Alkylaluminoxane compositions prepared from trimethylaluminum and triethylaluminum and uses thereof in ethylene oligomerization processes
AssigneeChevron Phillips Chemical Company LP
InventorsBrooke L. Small, Julie A. Leseberg
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Abstract
Alkylaluminoxane compositions are produced by a process that includes the steps of reacting trimethylaluminum, triethylaluminum, and water in a hydrocarbon solvent to form an alkylaluminoxane, and then removing insoluble aluminum-containing materials from the solvent to form the alkylaluminoxane composition containing from 0.1 to 20 wt. % of aluminum. Generally, the molar ratio of trimethylaluminum:triethylaluminum is from 5:95 to 80:20, and the molar ratio of water:aluminum is from 0.2:1 to 1:1. The alkylaluminoxane compositions can be utilized as an activator in transition metal-based catalyst systems and in ethylene oligomerization processes.
Claims20
A process for preparing an alkylaluminoxane composition, the process comprising:
- (a) reacting trimethylaluminum (TMA), triethylaluminum (TEA), and water in a hydrocarbon solvent to form an alkylaluminoxane, wherein:
- a molar ratio of TMA:TEA is from 5:95 to 80:20;
- and
- a molar ratio of water:Al is from 0.2:1 to 1:1;
- and
- (b) removing insoluble aluminum-containing materials from the solvent to form the alkylaluminoxane composition containing from 0.1 to 20 wt. % of aluminum.
An alkylaluminoxane composition comprising:
- (i) an alkylaluminoxane having random repeating units of formula (A) and formula (B):
- wherein:
- R is methyl and R′ is ethyl at a molar ratio of methyl:ethyl from 5:95 to 80:20;
- and
- (ii) a hydrocarbon solvent;
- wherein an amount of aluminum in the composition is from 0.1 to 20 wt. %.
An alkylaluminoxane composition produced by a process comprising:
- (a) reacting trimethylaluminum (TMA), triethylaluminum (TEA), and water in a hydrocarbon solvent to form an alkylaluminoxane, wherein:
- a molar ratio of TMA:TEA is from 5:95 to 80:20;
- and
- a molar ratio of water:Al is from 0.2:1 to 1:1;
- and
- (b) removing insoluble aluminum-containing materials from the solvent to form the alkylaluminoxane composition containing from 0.1 to 20 wt. % of aluminum.
Dependencies are inferred from the claim text.