Use of hydrocarbon-soluble aminomethylene phosphonic acid derivatives in the solvent extraction of iron ions from aqueous solutions

US5795482A · kind A · utility

Assignee

• BASF SE

Inventors

• Michael Ehle · Ludwigshafen, DE
• Knut Oppenlander · Ludwigshafen, DE

Key dates

• Filing date: Jan 8, 1997
• Grant date: Aug 18, 1998
• Expiry date: Jan 8, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S210/911
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Hydrocarbon-soluble aminomethylenephosphonic acid derivatives comprising the structural element of the formula I ##STR1## where R.sup.1 and R.sup.2 are hydrogen, C.sub.1 -C.sub.30 -alkyl which can additionally bear up to 15 hydroxyl groups and/or be interrupted by up to 14 non-adjacent oxygen atoms, C.sub.2 -C.sub.30 -alkenyl, C.sub.7 -C.sub.18 -aralkyl or C.sub.6 -C.sub.14 -aryl which may be substituted by up to three C.sub.1 -C.sub.12 -alkyl groups, C.sub.1 -C.sub.12 -alkoxy groups, halogen atoms, cyano groups, hydroxyl groups or C.sub.1 -C.sub.4 -alkoxycarbonyl groups, for the solvent extraction of iron ions from aqueous solutions.