Patent ID: 6267936
Filing Date: 2001-07-31
Classification: C22B,Y02P

Abstract:
A method of effecting solvent extraction of one or more metal ions from an aqueous solution, which comprises:solvent extracting at least one metal ion selected from the group consisting of magnesium, vanadium, chromium, molybdenum, manganese, cobalt, nickel, zinc, cadmium, aluminum, tin, and arsenic from an aqueous solution containing at least one other metal ion selected from the group consisting of magnesium, vanadium, chromium, molybdenum, manganese, iron, cobalt, nickel, copper, zinc, cadmium, aluminum, gallium, tin, arsenic and bismuth with an organic liquid phase containing a metal ion complexing compound having formula (II): ##STR7##wherein R.sup.3 to R.sup.6 are each hydrogen, C.sub.1 -C.sub.30 -alkyl which optionally contains up to fifteen hydroxyl groups or bc interrupted by up to fourteen non-adjacent oxygen atoms or both, C.sub.2 -C.sub.30 -alkenyl, C.sub.7 -C.sub.18 -aralkyl, C.sub.6 -C.sub.14 -aryl which can 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, or are each a group of the formula --CR.sup.1 R.sup.2 --PO.sub.3 H.sub.2, --CH.sub.2 --COOH or --CH.sub.2 --CH(OH)--R.sup.1, where at least one of the radicals R.sup.3 to R.sup.6 is the group --CR.sup.1 R.sup.2 --PO.sub.3 H.sub.2 and at least a further one of these radicals is C.sub.6 -C.sub.30 -alkyl, C.sub.6 -C.sub.30 -alkenyl, C.sub.7 -C.sub.18 -aralkyl, unsubstituted or substituted C.sub.6 -C.sub.14 -aryl or the group --CH.sub.2 --CH(OH)--R.sup.9, where R.sup.9 is C.sub.6 -C.sub.30 -alkyl, C.sub.6 -C.sub.30 -alkenyl, C.sub.7 -C.sub.18 -aralkyl or unsubstituted or substituted C.sub.6 -C.sub.14 -aryl, and where R.sup.1 and R.sup.2 are hydrogen, C.sub.1 -C.sub.30 -alkyl which optionally contains up to fifteen hydroxyl groups or is interrupted by up to fourteen non-adjacent oxygen atoms, C.sub.2 -C.sub.30 -alkenyl, C.sub.7 -C.sub.18 -aralkyl, C.sub.6 -C.sub.14 -aryl which is optionally 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;A is a C.sub.1 -C.sub.12 -alkylene group which optionally contains as substituenits up to three C.sub.1 -C.sub.30 -alkyl groups, C.sub.2 -C.sub.30 -alkenyl groups, C.sub.7 -C.sub.18 -aralkyl groups or C.sub.6 -C.sub.14 -aryl groups which can in turn 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, where, if a plurality of groups A are present, these can be identical or different; andp is a number from 0 to 30,000, thereby effecting extraction of at least one metal ion from at least one other metal ion, wherein said organic phase optionally includes at least one modifier, with the proviso that alkoxylated alcohol and alkoxylated amine modifiers are excluded.