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

摘要

PCT No. PCT/EP95/02327 Sec. 371 Date Jan. 8, 1996 Sec. 102(e) Date Jan. 8, 1996 PCT Filed Jun. 16, 1995 PCT Pub. No. WO96/00309 PCT Pub. Date Jan. 4, 1996Hydrocarbon-soluble aminomethylenephosphonic acid derivatives comprising the structural element of the formula I (I) where R1 and R2 are hydrogen, C1-C30-alkyl which can additionally bear up to 15 hydroxyl groups and/or be interrupted by up to 14 non-adjacent oxygen atoms, C2-C30-alkenyl, C7-C18-aralkyl or C6-C14-aryl which may be substituted by up to three C1-C12-alkyl groups, C1-C12-alkoxy groups, halogen atoms, cyano groups, hydroxyl groups or C1-C4-alkoxycarbonyl groups, for the solvent extraction of iron ions from aqueous solutions.