Patent · US Expired

Treatment of waste water produced in the manufacture of expandable polystyrene

US4011161A · kind A · utility

1Cited by

6References

7Claims

0Family size

Assignee

Badische Anilin- & Soda-Fabrik Aktiengesellschaft

Inventors

KARL POPP · Bischofswerda, DE
Klaus Hess
Werner Simmler
Richard Stickel · Bad Dürkheim, DE
Ludwig Zuern

Key dates

Filing date	Jan 23, 1975
Grant date	Mar 8, 1977
Priority date	—
Expiry date	Jan 23, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2103/38
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

Treatment of waste water produced in the manufacture of expandable polystyrene, comprising passing a stream of fine gas bubbles through the waste water and removing the resulting foam containing a high concentration of impurities from the aqueous phase. In a special embodiment of the invention, the aqueous phase can then be subjected to further treatment.

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