Extraction of rare earth elements with 1-(diphenylphosphorylmethoxy)-2-diphenylphosphoryl-4-ethylbenzene with the use of 1,1,7-trihydrododecafluoroheptanol as a solvent
摘要:
Extraction of rare earth elements from nitric acid solutions in a 1,1,7-trihydrododecafluoroheptanol-water system with the use of phosphoryl-containing podand 1-(diphenylphosphorylmethoxy)-2-diphenylphosphoryl-4-ethylbenzene (L) was studied. The content of metals in organic phase was shown to be negligible at nitric acid concentration lower 1 mol/L. Distribution ratio sharply increases with nitric acid concentration from 1 mol/L and reaches 5.5 for the yttrium subgroup elements at HNO3 concentration of 6 mol/L. The rare earth elements of the yttrium subgroup were found to be extracted much better than the rare earth elements of the cerium subgroup under the same conditions, the distribution ratios in both subgroups smoothly rise with atomic number of element. It was shown using the shift of extraction equilibrium that the M : L ratio in extracted complexes is 1 : 2 irrespective of the nature of rare earth element. The structure of complex {Yb[eta(2)-(O,O')-L](2)(eta(2)-O2NO)(2)}(O2NOHNO3), whose single crystals were isolated from extraction solution, was established by X-ray diffraction study. The system can be used for the isolation and separation of rare earth elements.
Structures of the compounds preparatively isolated in the extraction of rare-earth metals with 2-diphenylphosphoryl-1-diphenylphosphorylmethoxy-4-ethylbenzene
作者:S. V. Demin、S. E. Nefedov、V. E. Baulin、L. I. Demina、A. Yu. Tsivadze
DOI:10.1134/s1070328413040052
日期:2013.4
The structures of 2-diphenylphosphoryl-1-diphenylphosphorylmethoxy-4-ethylbenzene (L), its adduct with water and nitric acid, and the complex [(L)(2)Nd(eta(2)-O2NO)(2)](NO3) center dot NO3 center dot 2C(6)H(6) were determined by X-ray diffraction. The above compounds were isolated under conditions very similar to those used for extractive separation of rare-earth metals in the system water-1,1,7-trihydrododecafluoroheptan-1-ol with L as an extractant. Assignment of the absorption bands in the IR spectra of the single crystals obtained was performed.