Continuous process for the removal of residual monomer from aqueous dispersions of homo- and copolymers of vinyl chloride

US4138310A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Josef Kalka · Herten, DE
• Jürgen Beckmann · Johannesweg, DE

Key dates

• Filing date: May 14, 1976
• Grant date: Feb 6, 1979
• Expiry date: May 14, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous dispersions of homo- and co-polymers of vinyl chloride are freed of residual monomer in a continuous manner by mixing the dispersion with steam in a first flow pipe maintained at reduced pressure; degasifying the mixture to a first degasification vessel maintained at a lower pressure; again mixing the degassed mixture with steam in a second flow pipe, also maintained at reduced pressure and having fluid flow diverting means therein; and then again degasifying the mixture in a second degasification vessel maintained at a lower pressure than the second flow pipe.