Methods for Terminating Olefin Polymerizations
AssigneeChevron Phillips Chemical Company LP
InventorsMax P. McDaniel, Qing Yang, Kathy S. Clear, Tony R. Crain, Timothy O. Odi
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Abstract
Catalyst deactivating agents and compositions containing catalyst deactivating agents are disclosed. These catalyst deactivating agents can be used in methods of controlling polymerization reactions, methods of terminating polymerization reactions, methods of operating polymerization reactors, and methods of transitioning between catalyst systems.
Claims24
A method of controlling a polymerization reaction in a polymerization reactor system, the method comprising:
- (i) introducing a transition metal-based catalyst system, an olefin monomer, and optionally an olefin comonomer into a polymerization reactor within the polymerization reactor system;
- (ii) contacting the transition metal-based catalyst system with the olefin monomer and the optional olefin comonomer under polymerization conditions to produce an olefin polymer;
- and
- (iii) introducing a catalyst deactivating agent into the polymerization reactor to partially or completely terminate the polymerization reaction in the polymerization reactor;
- wherein the catalyst deactivating agent comprises a natural source oil, a siloxane, or a combination thereof.
19-20. (canceled)
A method of controlling a polymerization reaction in a polymerization reactor system, the method comprising:
- (A) introducing a first transition metal-based catalyst system, a first olefin monomer, and optionally a first olefin comonomer into a polymerization reactor in the polymerization reactor system;
- (B) contacting the first transition metal-based catalyst system with the first olefin monomer and the optional first olefin comonomer under polymerization conditions to produce a first olefin polymer;
- (C) discontinuing the introducing of the first transition metal-based catalyst system into the polymerization reactor before, during, or after a step of introducing a catalyst deactivating agent into the polymerization reactor;
- and
- (D) introducing a second transition metal-based catalyst system into the polymerization reactor and contacting the second transition metal-based catalyst system with a second olefin monomer and optionally a second olefin comonomer under polymerization conditions to produce a second olefin polymer;
- wherein the catalyst deactivating agent comprises a natural source oil, a siloxane, or a combination thereof.
A composition comprising:
- a hydrocarbon solvent having from 3 to 18 carbon atoms;
- and
- a catalyst deactivating agent comprising a natural source oil, a siloxane, or a combination thereof.
Dependencies are inferred from the claim text.