Process for recovering and purifying unreacted propylene during mass polymerization of liquid propylene

US4529795A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunter Mayer · Untereisesheim, DE
• Eberhard Fischer · Königsee, DE
• Helmut Strametz

Key dates

• Filing date: Nov 25, 1980
• Grant date: Jul 16, 1985
• Expiry date: Nov 25, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

During the recovery of the unreacted propylene from the mother liquor obtained in the polymerization of liquid propylene, the major part of the propylene is evaporated in a first evaporation step at a low temperature and the remaining part is evaporated in a second evaporator at a high temperature. In this way an early agglomerization of the atactic and/or low-molecular weight polymer dissolved in the mother liquor and fouling of the heat exchanger tubes and/or of the column trays is avoided.