THIRD PHASE FORMATION IN EXTRACTION OF THORIUM NITRATE BY MIXTURES OF TRIALKYL PHOSPHATES

1998 ◽  
Vol 16 (4) ◽  
pp. 1001-1011 ◽  
Author(s):  
T.G. Srinivasan ◽  
S. Vijayasaradhi ◽  
R. Dhamodaran ◽  
A. Suresh ◽  
P.R. Vasudeva Rao
Keyword(s):  
Phase Formation ◽  
Thorium Nitrate ◽  
Third Phase ◽  
Third Phase Formation ◽  
Trialkyl Phosphates

Third phase formation behaviour of tris(2-methylbutyl) phosphate and tri-n-alkyl phosphates in the extraction of mineral acids and tetravalent metal ions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Subramee Sarkar ◽  
A. Suresh ◽  
N. Sivaraman
Keyword(s):  
Phase Formation ◽  
Mineral Acid ◽  
Separation Processes ◽  
The Third ◽  
Third Phase ◽  
Metal Nitrates ◽  
Third Phase Formation ◽  
Mineral Acids ◽  
Nuclear Separation ◽  
Trialkyl Phosphates

Abstract The formation of third phase is a detrimental phenomenon witnessed in the nuclear separation processes during the extraction of certain metal salts by an organic solution, which comprises of a neutral extractant, tri-n-butyl phosphate dispersed in a non-polar diluent, n-dodecane (n-C12H26). In the present work, a comparative analysis on the third phase formation behaviour of three trialkyl phosphates, TBP, its linear and branched higher homologues tri-n-amyl phosphate and tris(2-methylbutyl) phosphate (T2MBP), respectively, have been provided which will be useful for the identification of an extractant with minimum third phase formation tendency. The organic phase splitting behaviour during the extraction of three mineral acids (HClO4, HCl and HNO3) and two tetravalent metal nitrates (Th(IV) and Zr(IV)) by trialkyl phosphates has been investigated to understand the influence of anionic and cationic components, respectively, in third phase formation of trialkyl phosphates. The effect of structure of the alkyl groups of trialkyl phosphate and chain length of diluents on third phase formation during Zr(IV) extraction from HNO3 media have also been studied. Overall, the third phase formation behaviour of T2MBP was found to be lower both for the extraction of mineral acid and Zr(IV), thereby indicating its potentiality for applications in various solvent extraction processes.

Third-phase formation in the extraction of thorium nitrate byN,N-dihexyloctanamide

2009 ◽  
Vol 12 (1-3) ◽  
pp. 68-72 ◽  
Author(s):  
R.K. Jha ◽  
P.N. Pathak ◽  
K.K. Gupta ◽  
P.G. Kulkarni ◽  
P.B. Gurba ◽  
...  
Keyword(s):  
Phase Formation ◽  
Thorium Nitrate ◽  
Third Phase ◽  
Third Phase Formation

Third phase formation in the extraction of Th(NO3)4 by tri-2-methyl butyl phosphate from nitric acid media

2007 ◽  
Vol 95 (8) ◽  
Author(s):  
A. Suresh ◽  
R. Deivanayaki ◽  
T. G. Srinivasan ◽  
P. R. Vasudeva Rao
Keyword(s):  
Nitric Acid ◽  
Phase Formation ◽  
Linear Dependence ◽  
Temperature Calibration ◽  
Acid Media ◽  
Third Phase ◽  
Calibration Measurement ◽  
Third Phase Formation ◽  
Trialkyl Phosphates ◽  
Correct Data

In the above mentioned paper we had reported a non-linear dependence of limiting organic concentration (LOC) with temperature in the case of tri-2-methyl butyl phosphate in n-tetradecane as well as n-hexadecane diluents. Subsequently we extended the studies to other trialkyl phosphates such as TBP, TiBP, TsBP, TAP, TiAP and TsAP in various diluents (n-decane, n-dodecane, n-tetradecane, n-hexadecane and n-octadecane) and found recently that the dependence was always linear, irrespective of the extractant-diluent combination. This behaviour urged us to have a thorough review of the data reported earlier and when we repeated the studies again in the same systems, we found that the dependence was only linear and not as reported earlier.We have critically looked into what went wrong in the earlier studies and at present have concluded that wrong temperature calibration/measurement might have induced the same.We now present the correct data in Tables 1 and 2 and 4. Some parts of the sections “Results and discussion” and “Conclusions” are also modified.

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