Suspension process for preparing ethylene polymers comprising drying of the polymer particles

US12221500B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Peter Rohrbach · Remchingen, DE
• Jürgen Perzlmeier · Neustadt an der Donau, DE
• Mudit Ashtana · The Hague, NL
• Harald Prang · Lechenich, DE
• Elke Damm · Bad Vilbel, DE

Key dates

• Filing date: May 28, 2020
• Grant date: Feb 11, 2025
• Expiry date: Feb 5, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/54
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into wet ethylene polymer particles and mother liquor, drying the wet ethylene polymer particles by a gas stream and forming a gas stream carrying a hydrocarbon load, and thereafter separating the hydrocarbon load from the gas stream and thereby forming a liquid hydrocarbon recover stream, transferring a part of the mother liquor into a work-up section including an evaporator for producing a wax-depleted portion of the mother liquor and a diluent distillation unit for producing isolated diluent from the wax-depleted portion of the mother liquor, wherein a first part of the hydrocarbon recover stream is transferred to the diluent distillation unit without passing the evaporator for producing the wax-depleted portion of the mother liquor.