Patent · US Active

Process for controlling an ethylene polymerization process

US9790303B2 · kind B2 · utility

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20Claims

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Assignee

Basell Polyolefine GmbH · DE

Inventors

Reinhard Kuehl · Bornheim, DE
Rodrigo Carvajal · Bonn, DE
Gerhardus Meier · Frankfurt, DE
Elke Damm · Bad Vilbel, DE
Phil Pyman · Lymm, GB

Key dates

Filing date	Jun 22, 2015
Grant date	Oct 17, 2017
Priority date	—
Expiry date	Jun 22, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F2400/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A method for controlling a slurry polymerization for the preparation of polyethylene, where the polyethylene is formed in a polymerization reactor comprising a vapor section by contacting a Ziegler-type catalyst, ethylene, and either hydrogen or, as comonomer(s), one or more C3 to C10 alpha-olefins or hydrogen and one or more C3 to C10 alpha-olefins, wherein the ethylene partial pressure is maintained by adjusting the flow rate of the catalyst to the polymerization reactor and the hydrogen/ethylene and comonomer/ethylene partial pressure ratios are maintained by adjusting the flow rates of hydrogen and/or of the one or more comonomers to the polymerization reactor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.