Reactor operability in a gas phase polymerization process
AssigneeNOVA Chemicals (International) S.A.
InventorsPeter Phung Minh Hoang, Benjamin Milton Shaw, Andy Mak
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Abstract
Olefin polymerization is carried out with a single site polymerization catalyst in the presence of a continuity additive. The continuity additive is a cocktail containing one or more dialkanolamide derived from a fatty acid, an oil soluble sulfonic acid and a dialkanolamine.
Claims26
A process for polymerizing ethylene and optionally an alpha olefin in a reactor with at least one single site polymerization catalyst in the presence of a continuity additive, said continuity additive comprising:
- i) a fatty acid dialkanolamide,
- ii) an oil soluble sulfonic acid, and
- iii) a dialkanolamine.
A process for polymerizing ethylene and optionally an alpha olefin in a reactor with at least one single site polymerization catalyst in the presence of a continuity additive, said continuity additive comprising:
- i) at least one fatty acid diethanolamide having the formula R1C(═O)N(CH2CH2OH)2 where R1 is a hydrocarbyl group having from 5 to 30 carbon atoms;
- ii) a benzene sulfonic acid having the formula R3C6H4SO3H, where R3 is a hydrocarbyl group having from 6 to 30 carbon atoms;
- and
- iii) a dialkanolamine having the formula HN((CH2)xOH)2 where x is independently an integer of from 1 to 8;
- wherein the at least one single site polymerization catalyst comprises a phosphinimine catalyst, a cocatalyst and an inert support and the phosphinimine catalyst has the formula:
- (L)(Pl)MX2, where M is Ti, Zr or Hf;
- Pl is a phosphinimine ligand having the formula R3P═N—, where R is independently selected from the group consisting of hydrogen, halogen, and C1-C20 hydrocarbyl;
- L is ligand selected from the group consisting of cyclopentadienyl, substituted cyclopentadienyl, indenyl, substituted indenyl, fluorenyl, and substituted fluorenyl;
- and X is an activatable ligand.
Dependencies are inferred from the claim text.