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Supercritical direct extraction of neodymium using TTA and TBP

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Title Supercritical direct extraction of neodymium using TTA and TBP
 
Creator VINCENT, T
MUKHOPADHAY, M
WATTAL, PK
 
Subject fluorinated beta-diketones
tributyl-phosphate
fluid extraction
carbon-dioxide
lanthanides
uranium
separation
thorium
oxides
ions
sc co(2)
neodymium
tta
tbp
extraction
dissolution
mass transfer coefficient
 
Description Extraction of a metal ion from its oxide using ligand assisted supercritical carbon dioxide (SC CO(2)) comprises namely ionisation of metal oxide, in-situ chelation of metal cation with the ligand to form metal chelate/adduct and subsequently its extraction. Understanding of the mass transfer of chelate/adduct is very important in deciding the overall performance of the in-situ supercritical fluid extraction (ISCFE) process. For the present study neodymium (Nd) is selected as a model metal ion for its extraction from oxide using a mixed ligand system containing thenoyl tri-fluoroacetone (TTA) and tri-butylphosphate (TBP). Extraction studies have been performed at 35 MPa and 60 degrees C for the prepared Nd-TTA-TBP adduct as well as for neodymium oxide (Nd(2)O(3)). The rate of dissolution starting from oxide and TTA-TBP adduct of Nd have been calculated and compared with the equilibrium values based on dissolution studies at the same conditions of temperature and pressure. During the extraction starting from oxide, the ligands TTA and TBP are also co-extracted with the adduct as these are highly soluble in SC CO(2). Mass transfer coefficient has also been estimated for the steady state during the dynamic extraction. It is observed that the rate of extraction and mass transfer coefficient increase with flow rate of SC CO(2).
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-10-23T00:51:48Z
2011-12-15T09:10:58Z
2011-10-23T00:51:48Z
2011-12-15T09:10:58Z
2008
 
Type Article; Proceedings Paper
 
Identifier DESALINATION,232,91-101
0011-9164
http://dx.doi.org/10.1016/j.desal.2008.02.004
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15009
http://hdl.handle.net/100/1765
 
Source 2nd Biennial Symposium on Emerging Trends in Separation Science and Technology (SESTEC 2006),Mumbai, INDIA,SEP 29-OCT 01, 2006
 
Language English