Patent · US Expired

Process for the purification of phenol and phenol formaldehyde containing waste water

US4157300A · kind A · utility

3Cited by

15References

12Claims

0Family size

Assignee

Deutsche Gold- und Silber-Scheideanstalt Vormals Roessler

Inventors

Helmut Junkermann · Frankfurt, DE
Volker Hafner · Langenselbold, DE

Key dates

Filing date	Dec 2, 1977
Grant date	Jun 5, 1979
Priority date	—
Expiry date	Dec 2, 1997

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/917
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

Phenol or phenol-formaldehyde containing waste water is purified with chlorine dioxide by treating the waste water with alkali or alkaline earth metal chlorite in the presence of formaldehyde and the weight ratio of formaldehyde to phenol is between 0.5 to 2:1 and the mole ratio of the sum of phenol + formaldehyde to chlorite is between 1:1.2 to 1:2, whereupon the treated water is decolorized, in a given case in known manner.

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