Particles for selective removal of metal complex anions from aq. soln. - has ion-pairing agent dispersed in aq. phase which is present in a gel or encapsulated

摘要

Particulate agent for selective removal of metal complex anions (I) from aq. soln. comprises an ionic, non-polymeric agent (II), able to form ion pairs with (I), dispersed in a continuous aq. phase which is embedded in a hydrophilic gel, and/or a component of such a gel and/or encapsulated in a water-insoluble, ion-permeable covering. specifically (II) is an amine salt of formulae (R1,R2NH2)+x- or (R1R2R3NH)+X-R11R2 and R3 = 6-20C alkyl (opt. substd. by OR4 or SR4) or aryl (esp phenyl) opt. substd. by 1-3 lower alkyl (esp. me), x = residue of organic or inorganic acid, pref. sulphale, nitrate or halide, esp. chloride. - The agent pref. comprises (by wt.) 0.5-30% gel. forming agent, 1-50% (II); 0-40(10-30)% water-insol. solvent; 0-10% auxiliaries and 40-90% water. Partic. the continuous aq phase is embedded in a thermally-crosslinked gel and encapsulated by a covalently-crosslinked gel. The particles are of dia. 0.1-6(esp. about 15)mm. USE/ADVANTAGE - The method is used to remove (I) for environments protection or recovery of )valuable metals. The particulate agent provides better selectively, ease of handling and efficiency companed with liq-liq extn. processes. The particles have high mechanical stability, provide a large exchange surface and are easily sped. from soln.