Suspension process for preparing ethylene polymers comprising work-up of the suspension medium

US12240923B2 · kind B2 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

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

Key dates

• Filing date: May 28, 2020
• Grant date: Mar 4, 2025
• Expiry date: Apr 26, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/54
• WIPO field: Chemical engineering
• 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, 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, a diluent distillation unit for producing isolated diluent from the wax-depleted portion of the mother liquor, and a wax removal unit operated by direct steam distillation for producing a gaseous hydrocarbon/steam mixture which is condensed and then separated into an aqueous phase and a hydrocarbon phase, wherein a first part of the hydrocarbon phase is transferred to the diluent distillation unit without passing the evaporator for producing the wax-depleted portion of the mother liquor.