Process for recovering hydrocarbons in a solution polymerisation process

US10759880B2 · kind B2 · utility

Assignee

• Borealis AG · AT

Inventors

• Mohammad Al-Haj Ali · Porvoo, FI
• Erik Eriksson · Helsinki, FI
• Guhan Mathivanan · Linz, AT
• Henry Sleijster · Echt, NL
• Sameer Vijay · Linz, AT
• Christof Wurnitsch · Eisenlohrsweg, AT
• Samuli Zitting · Tuusula, FI

Key dates

• Filing date: Dec 21, 2016
• Grant date: Sep 1, 2020
• Expiry date: Apr 7, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F36/02
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for producing a polymer composition comprising the steps (A) to (M) as recited herein, involving the polymerization, in a polymerization reactor of a first polymer, a first stream thereof being passed into a first separator wherein a first liquid phase comprising the polymer and a first vapor phase coexist; withdrawing a first vapor stream and a first concentrated solution stream comprising the polymer from the first separator, passing at least a part of the first vapor stream to a first fractionator; withdrawing a first overhead stream and a first bottom stream from the first fractionator; recovering at least a part of the first overhead stream as a first recycle stream and passing it to the polymerization reactor; passing the first concentrated solution stream from the first separator to a second separator, wherein a second liquid phase comprising the polymer and a second vapor phase coexist; passing at least a part of the second vapor stream to a second fractionator; withdrawing a second overhead stream and a second bottom stream from the second fractionator; recovering at least a part of the second overhead stream as a second recycle stream and passing it to the polym…