Patent · US Expired

Use of citric acid partial esters for the extraction of iron

US4820417A · kind A · utility

3Cited by

1References

16Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Willi Buchmeier · Goldkronach, DE
Ralf Kehl · Goldkronach, DE
Werner Schwab · Monheim, DE

Key dates

Filing date	Feb 8, 1988
Grant date	Apr 11, 1989
Priority date	—
Expiry date	Feb 8, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/20
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Citric acid partial esters corresponding to the following general formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 represent hydrogen or a straight-chain or branched C.sub.4 -C.sub.20 alkyl radical or a metal atom, with the proviso that at least one but at most two of the substituents R.sup.1, R.sup.2 and R.sup.3 represent such an alkyl radical, or mixtures of the citric acid partial esters corresponding to general formula (I), are used for the extraction of iron from aqueous solutions.

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