Recovering ethylene and vinyl acetate from the residual gas stream of vinyl ester-ethylene copolymer preparation

US7582724B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Mehmet Guenaltay · Emmerting, DE
• Manfred Selig · Burghausen, DE

Key dates

• Filing date: Dec 14, 2006
• Grant date: Sep 1, 2009
• Expiry date: Dec 14, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/003
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a process for the preparation of copolymers containing vinyl esters and ethylene or ethylenically unsaturated monomers by aqueous, free radical polymerization at a pressure of from 5 to 100 bar absolute by the emulsion or suspension polymerization method, after the end of the polymerization, the reaction mixture is let down to a pressure of from 0.1 to 5 bar absolute and recovery of unconverted monomers is effected by multistage fractional low-temperature condensation from the residual gas.