Patent · US Expired

Substituted thioureas for the separation of complexly bound heavy-metal ions

US4980071A · kind A · utility

4Cited by

7References

3Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Michael Schuster · Frankfurt, DE
Karl-Heinz Koenig
Hermann Lotter · Großkrotzenburg, DE
Karlheinz Drauz · Alzenau, DE

Key dates

Filing date	Nov 14, 1989
Grant date	Dec 25, 1990
Priority date	—
Expiry date	Nov 14, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/912
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Heavy metals can be precipitated from waste water or aqueous reaction solutions containing inorganic and/or organic complexing agents with substituted thiorureas of the general formula R.sub.1 R.sub.2 N-CS-NH-COR.sub.3. N,N-dialkyl-N'-benzoyl thioureas are used with preference, whereby methyl, ethyl, n-propyl or isobutyl groups are used as alkyl substituents.

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