Use of hydrocarbon-soluble aminomethylene phosphonic acid derivatives in the solvent extraction of iron ions from aqueous solutions
AssigneeBASF SE
InventorsMichael Ehle, Knut Oppenlander
Life of this patent
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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.
Claims8
A process for the solvent extraction of iron ions from aqueous solutions, which comprises extracting an aqueous solution containing iron ions with a solvent containing a hydrocarbon-soluble aminomethylenephosphonic acid having a structural element of formula (I) ##STR10## 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 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.
A process for the solvent extraction of metal ions from aqueous solutions, which comprises extracting with a solvent containing an alkoxylated long-chain alcohol of formula (III)
- R.sup.7 --O--(XO).sub.m --H
- or an alkoxylated long-chain amine of formula (IV) ##STR15## where R.sup.7 is C.sub.6 -C.sub.30 -alkyl, C.sub.6 -C.sub.30 -alkenyl, C.sub.7 -C.sub.18 -aralkyl or C.sub.6 -C.sub.14 -aryl which may be unsubstituted or 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,
- R.sup.8 is hydrogen, C.sub.1 -C.sub.5 -alkyl, C.sub.2 -C.sub.5 -alkenyl or a group --(XO).sub.m --H or is as defined for R.sup.7,
- X is a 1,2-alkylene group having from 2 to 30 carbon atoms or a group of the formula --CH.sub.2 --CHR.sup.10 --, where R.sup.10 is 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, and
- m is a number from 1 to 20.
Dependencies are inferred from the claim text.