J. Chim. Phys.
Volume 60, 1963
|Page(s)||81 - 88|
|Published online||28 May 2017|
A fundamental study on the ion exchange separation of lithium, nitrogen and uranium isotopes
Laboratory of Nuclear Chemistry, Tokyo Institute Of Technology, Meguro, Tokyo, Japan., Japan..
Fundamental equations for the ion exchange separation factor of the isotopes A and B are derived :
for the system having the molecules or ion associations
for the system having stepwise series of complexes
According to the prediction based on these fundamental equations, some experimental works have been done to obtain larger separation factors for the isotopes Li, N and U. The results are as follows :
1,005-1,008 for the system of a weaker electrolyte, LiOH, in the external solution with the strongly acidic and very highly cross-linked cation exchange resins. The separation factor reaches 1,012 when acetone is added to the same system to reduce the dissociation constant of LiOH. 1,013-1,015 for the system of strong electrolyte, LiCL, in the external solution with the weakly acidic inorganic cation exchanger, Ionite C (zirconium phosphate typ). 1,016 for the system of LiOH in the aqueous external solution with Ionite C. The value 1,022 is obtained by adding acetone to the same system.
1,027-1,029 for the system of weak electrolyte, NH3, in the external aqueous solution either with strongly acidic cation exchange resins or with Ionite C. The addition of organic solvent such as ethanol or acetone gives better results especially with very highly cross-linked cation exchange resins.
The values 1,000 28-1,000 40 are estimated from break through experiments with hydrochloric acid solutions containing greater part of uranous together with smaller part of uranyl ions.
© Paris : Société de Chimie Physique, 1963