Patent · US Expired

Working up wastewaters containing hydroxylamine or its salts

US4725360A · kind A · utility

4Cited by

3References

5Claims

0Family size

Assignee

BASF SE

Inventors

Hugo Fuchs · Ludwigshafen, DE
Erwin Thomas · Freinsheim, DE
Franz-Josef Weiss · Schifferstadt, DE
Josef Ritz · Ludwigshafen, DE

Key dates

Filing date	Mar 6, 1987
Grant date	Feb 16, 1988
Priority date	—
Expiry date	Mar 6, 2007

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J39/05
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Wastewaters containing hydroxylamine or its salts are worked up by a process in which the said wastewaters are passed over a strongly acidic ion exchanger, after which a 5-15% strength by weight aqueous sulfuric acid is passed over the said ion exchanger and a solution of hydroxylammonium sulfate in aqueous sulfuric acid is obtained.

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