Patent · US Active

Multi-reactor slurry polymerization processes with high ethylene purity

US10047176B2 · kind B2 · utility

1Cited by

5References

16Claims

0Family size

Assignee

Basell Polyolefine GmbH · DE

Inventors

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

Key dates

Filing date	Aug 13, 2015
Grant date	Aug 14, 2018
Priority date	—
Expiry date	Aug 13, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F2500/05
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A slurry polymerization process for the preparation of polyethylene in a reactor cascade of two or more polymerization reactors including the steps of feeding to a polymerization reactor amounts of ethylene, of a Ziegler catalyst, of fresh aluminum alkyl and of a diluent; feeding the slurry product withdrawn from the polymerization reactor to a second polymerization reactor; and feeding additional amounts of ethylene and of diluent wherein the ethylene is first passed through an ethylene purification unit, which reduces at least the concentration of carbon monoxide, carbon dioxide, oxygen, acetylene and water contained in the ethylene, before it is fed to the two or more polymerization reactors of the reactor cascade.

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