Patent · US Active

Method for processing wastewater and exhaust gas condensates from the polymerization of vinyl acetate and ethylene in an aqueous medium

US9061922B2 · kind B2 · utility

0Cited by

8References

6Claims

0Family size

Assignee

Wacker Chemie AG · DE

Inventors

Mehmet Guenaltay · Emmerting, DE
Hans-Peter Weitzel · Reischach, DE
Bernhard Eckl · Burghausen, DE

Key dates

Filing date	May 31, 2012
Grant date	Jun 23, 2015
Priority date	—
Expiry date	May 31, 2032

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2103/38
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A method for processing wastewater and exhaust gas condensates from the polymerization of vinyl acetate and ethylene and optionally other comonomers in an aqueous medium by suspension or emulsion polymerization employs relieving pressure after completion of the polymerization of the polymerization batch and discharging the polymer dispersion. During the relieving, the gaseous phase is removed by means of a compressor. Optionally, the gaseous phase occurring during stripping is removed by the compressor and cooled by one or more heat exchangers before entry into the compressor. The liquid phases occurring in the compressor and optionally in the heat exchanger are separated from the gaseous phase and the liquid phases are given to a rectification column, and separated into a vinyl acetate monomer phase and a wastewater phase, and the vinyl acetate monomer phase is resupplied to polymerization.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.