Polymerization process with a partial shutdown phase

US10626195B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Erich Neumann · Braunschweig, DE
• Sven Wolfram · Euskirchen, DE
• Christoph Wolf · Pulheim, DE
• Juergen Mohrbutter · Bornheim, DE
• Dieter Littmann · Heßheim, DE

Key dates

• Filing date: Nov 16, 2016
• Grant date: Apr 21, 2020
• Expiry date: Dec 28, 2036

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00164
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for polymerizing ethylene to obtain an ethylene-based polymer in a plant, wherein the plant includes a reactor in fluid communication with a recycle connection, wherein the process includes a polymerization phase, a partial shutdown phase, and the steps of reducing the pressure in the reactor for entering into the partial shutdown phase from the polymerization phase; and increasing the pressure in the reactor for exiting from the partial shutdown phase and re-entering the polymerization phase.