Method for reducing sheeting during polymerization of alpha-olefins
AssigneeUnion Carbide Corporation
InventorsMark G. Goode, Daniel M. Hasenberg, Thomas J. McNeil, Thomas E. Spriggs
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Abstract
A method for reducing sheeting during polymerization of alpha-olefins by feeding either a positive charge generating or negative charge generating chemical additive to the reactor responsive to particular static levels in the reactor. The chemical additive is added in amounts which neutralize the charges in the reactor.
Claims12
A method for reducing sheeting during polymerization of alpha-olefins in a low pressure fluidized bed reactor utilizing titanium or vanadium based compounds as catalysts together with alkyl aluminum cocatalysts which comprises determining the electrostatic levels at the site of possible sheet formations in said reactor;
- if negative electrostatic levels are indicated then adding a positive charge generating chemical additive to the reactor said additive being selected from the group consisting of alcohols containing up to 7 carbon atoms, oxygen and nitric oxide;
- if positive electrostatic levels are indicated in said reactor then, adding a negative charge generating chemical additive to the reactor said chemical additive being a ketone containing up to 7 carbon atoms, said positive or negative charge generating chemical additive being added to said reactor as required in an amount sufficient to create and maintain neutral static charges in said reactor.
Dependencies are inferred from the claim text.