85071-64-3Relevant articles and documents
LE POUVOIR EXTRACTANT DES PHOSPHONATES β CARBONYLES VIS-A-VIS DU CUIVRE, DU COBALT ET DU NICKEL
Sturz, G.,Clement, J. C.,Daniel, A.,Molinier, J.,Lenzi, M.
, p. 161 - 172 (2007/10/02)
The copper-cobalt-nickel separation being an nowadays industrial problem, this work was aimed to correlate the structure of some β carbonyl phosphonate compounds with the extractibility of three corresponding cations (4).The generalised formula of these compounds is: (RO)2P(O)-CH2-C(O)-R' and the way to synthesise them depends upon the nature of R and R' (R is always a saturated hydrocarbon radical).The different samples are described in table I.Toluen has been chosen as the dilutant and the studied pH domain extends from the pH of first contact between phases to the pH of precipitation of the metal hydroxides.The following compounds exhibit a slight affinity for copper, cobalt and nickel: E1 : R' is the phenyl radical.E2, E3 : R' is the parafluorophenyl radical.E5 : R' is a saturated hydrocarbon radical.E9 : R' is a partially fluorine substituted aliphatic radical.The compounds are not interesting for solving the industrial problem with which we are concerned.On the contrary, the following compounds exhibit, in certain conditions (pH, concentration) an excellent affinity for one or another of the three metals, allowing sometimes a complete extraction : E4 (figure 1) : R' is the hydrogen atom.E6, E7, E8 (table II, figure 2 and table III) : R' is a completely fluorine substituted aliphatic radical, by way of example E6 extracts well nickel or cobalt and E7, E8 extract well copper.One can notice the formation of a third phase with E7 (R = -C2H5).The substitution of the ethyl group by the normal butyl (E8, R = -C4H9) increases the lipophilicity of the complex metal phosphonate and the compound E8 is able to realise the purification of diluted cobalt or nickel aqueous solutions towards copper.
