Process for separating and recovering residual monomers from aqueous suspensions of acrylonitrile polymers

US3980529A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerd Wilhelm · Überlingen, DE
• Karl Hurm
• Rolf-Burkhard Hirsch · Dormagen, DE
• Artur Jaschke · Cologne, DE
• Herbert Marzolph

Key dates

• Filing date: Apr 21, 1975
• Grant date: Sep 14, 1976
• Expiry date: Apr 21, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/922
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the recovery of acrylonitrile and other monomers from an aqueous polymer dispersion by continuous distillation in a thin-layer evaporator under reduced pressure, condensation of the evaporated monomers in a condenser under the same or similar reduced pressure and subsequent condensation or absorption respectively of the monomer vapors which have not been condensed in the condenser at a higher pressure.