Chemical process

US7576162B2 · kind B2 · utility

Assignees

• AKZO NOBEL N.V. · NL
• Max-Planck-Gesellschaft zur Föderung der Wissenschaften e.V. · US

Inventors

• Oliver Struck · Henfenfeld, DE
• Andreas Pingel-Keuth · St. Blasien, DE
• Christian Przybyla · Duisburg, DE
• Ulrich Fehrenbacher · Karlsruhe, DE
• Thomas Hirth · Bogen, DE
• Steffen Unser · Rheinstetten, DE

Key dates

• Filing date: Jun 21, 2006
• Grant date: Aug 18, 2009
• Expiry date: Feb 7, 2028

Classification

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

Abstract

The invention relates to a process for the production of a nitrogen containing epihalohydrin polymer involving reaction of a nitrogen-containing precursor selected from the group consisting of amines, poly-amines, polyaminoamides, polyurethanes and mixtures thereof with epihalohydrin to form of a solution of said epihalohydrin polymer, the process comprising a purification step to remove organic impurities from the formed solution of the epihalohydrin polymer, said purification step comprising contacting the solution of the epihalohydrin polymer with a fluid under liquid, supercritical or near supercritical conditions to effect extraction of organic impurities from the solution of the epihalohydrin polymer to the fluid, withdrawing fluid enriched in organic impurities from the solution of the epihalohydrin polymer, and separating extracted impurities from the withdrawn fluid, wherein the fluid comprises a substance that at atmospheric pressure and room temperature (about 25° C.) is gaseous. The invention also relates to a process for purifying a solution of a nitrogen containing epihalohydrin polymer.