Patent · US Expired

Method for isolating olefins from polyolefin plants

US6462150B1 · kind B1 · utility

1Cited by

3References

11Claims

0Family size

Assignee

Basell Polyolefine GmbH · DE

Inventors

Stefan Bitterlich · Dirmstein, DE
Kaspar Evertz · Schifferstadt, DE
Manfred Hecker · Linz, DE
Hans-Jacob Feindt · Flemington, US

Key dates

Filing date	Aug 9, 2001
Grant date	Oct 8, 2002
Priority date	—
Expiry date	Aug 9, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C7/005
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to a method for the isolation of olefins from a gas mixture comprising one or more olefins, inert gas and catalyst poison, where the gas mixture is fed to a separation unit (18) and separated into olefin and inert gas. The method according to the invention has the special feature that an apparatus (17) is installed upstream or downstream of the separation unit (18) and thati) in the case of an upstream apparatus (17), the catalyst poison is at least partially removed from the gas mixture, andii) in the case of a downstream apparatus (17), the catalyst poison is at least partially removed from the separated-off olefin.The olefins here are preferably isolated from a gas mixture formed as offgas in catalytic gas-phase polymerization for the preparation of polyolefins. The recovery of the olefins from the offgas is of economic importance.

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