Patent · US Active

Olefin polymerization process in a gas-phase reactor comprising a riser unit and a downcomer

US10968291B2 · kind B2 · utility

1Cited by

10References

20Claims

0Family size

Assignee

Basell Polyolefine GmbH · DE

Inventors

Gerhardus Meier · Frankfurt, DE
Ulf Schueller · Weiterstadt, DE
Gabriele Mei · Ferrara, IT
Massimo Covezzi · Ferrara, IT
Pietro Baita · Rovigo, IT
Lorella Marturano · Ferrara, IT

Key dates

Filing date	Nov 9, 2017
Grant date	Apr 6, 2021
Priority date	—
Expiry date	Mar 6, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F2/34
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for preparing an ethylene polymer including the step of homopolymerizing ethylene or copolymerizing ethylene with one or more comonomers in a gas-phase polymerization reactor including a riser unit wherein growing polymer particles flow upwards under fluidization, fast fluidization or transport conditions and a downcomer wherein growing polymer particles flow downward in a densified form, wherein the hold-up of polymer particles in the downcomer is from 55 wt. % to 80 wt. % of the total hold-up of polymer particles in the gas-phase polymerization reactor.

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