Single-site catalyst polyolefin polymerization process
AssigneeExxonMobil Chemical Patents Inc.
InventorBlu E. Englehorn
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Abstract
Disclosed is a method for polymerizing olefins comprising passing a heterogeneous single-site catalyst to a solution or slurry polymerization reactor in the absence of pre-polymerization, wherein the polymerization reactor operates at a temperature of at least 50° C. The heterogeneous single-site catalyst may be suspended and/or dissolved in a solvent selected from the group consisting of oils, aliphatic hydrocarbons and mixtures thereof. Also, the heterogeneous single-site catalyst may be passed to the polymerization reactor at a velocity of greater than 1 m/s or 3 m/s.
Claims18
In a polymerization reactor system comprising a polymerization reactor, a pre-polymerization reactor and a catalyst injection line fluidly connected to both and directed to by-pass the pre-polymerization reactor, a method comprising passing a heterogeneous single-site catalyst to the catalyst injection line and contacting the heterogeneous single-site catalyst with propylene monomers in the polymerization reactor at a temperature of at least 50° C.
Dependencies are inferred from the claim text.