Process for the removal of vinyl chloride from polyvinyl chloride dispersions

US4017445A · kind A · utility

Assignee

• Chemische Werke Huels Aktiengesellschaft · US

Inventors

• Hans Grosse-Wortmann
• Bernhard Hentschel · Cologne, DE
• Peter Rauth
• Karl-Heinz Schoenberg
• Bernd Terwiesch
• Hermann Winter · Marl, DE

Key dates

• Filing date: Aug 28, 1975
• Grant date: Apr 12, 1977
• Expiry date: Aug 28, 1995

Classification

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

Abstract

Residual vinyl chloride contents of aqueous polyvinyl chloride dispersions is reduced to less than 50 ppm by withdrawing steam and vinyl chloride contained in a boiling aqueous polyvinyl chloride dispersion at a temperature of 80.degree.-100.degree. C. and at a vaporization rate per minute of 0.006-0.2 kg. steam per kg. of polyvinyl chloride for a period of time from 3-60 minutes until a vinyl chloride content of less than 50 p.p.m. is achieved.