Patent · US Expired

Method for drying and degassing polyolefins

US6465608B1 · kind B1 · utility

1Cited by

4References

18Claims

0Family size

Assignee

Basell Polyolefine GmbH · DE

Inventors

Michael Witt · Zevenaar, NL
Paulus De Lange · Wesseling, DE
Thomas Perner · Eßlingen, DE
Andreas Deckers · Flomborn, DE
Kaspar Evertz · Schifferstadt, DE
Dieter Lilge · Schifferstadt, DE

Key dates

Filing date	Nov 15, 2001
Grant date	Oct 15, 2002
Priority date	—
Expiry date	Nov 15, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F210/16
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method for drying and degassing polyolefins in which the polymerization product leaving a polymerization reactor is brought into contact with a degassing medium and simultaneously decompressed. The degassing medium employed according to the invention is the monomer to be polymerized, which, in particular, flows through a decompression tank in a circulation process and which is preferably also enriched with ethylene or other low-boiling olefins in an amount in the range from 0 to 100 mol %, based on the total amount of circulating gas. A polymerization in an amount of up to 10%, based on the total polymerization conversion, takes place in accordance with the invention inside the decompression tank.

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