Patent · US Expired

Manufacture of ethylene copolymers

US4217431A · kind A · utility

8Cited by

5References

2Claims

0Family size

Assignee

BASF SE

Inventors

Wieland Zacher
Klaus Pfleger · Wesseling, DE
Klaus Boettcher
Ronald Skorczyk · Bonn, DE
Oskar Buechner · Dudenhofen, DE

Key dates

Filing date	Jan 10, 1979
Grant date	Aug 12, 1980
Priority date	—
Expiry date	Jan 10, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F210/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A continuous process for the manufacture of ethylene copolymers under high pressure and at high temperature in a polymerization zone, with transfer of the reaction mixture into a high pressure product isolation zone and from there into a low pressure product isolation zone, and recycling of the unconverted gas from the high pressure product isolation zone into the polymerization zone and from the low pressure product isolation zone into a low temperature separator, from where the comonomer separated off is recycled to the polymerization process, while the ethylene is discharged as off-gas. The gas taken off the low pressure product isolation zone is preferably compressed to from 10 to 20 bar and cooled to from -10.degree. to -30.degree. C. before it is fed into the low temperature separator. There is a substantial improvement in the efficiency of separating off the comonomer.

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