scholarly journals Extraction and separation of U(VI) and Th(IV) from hydrobromic acid media using Cyanex-923 extractant

2010 ◽  
Vol 75 (11) ◽  
pp. 1549-1557 ◽  
Author(s):  
Snehal Ghag ◽  
Suresh Pawar
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Organic Phase ◽  
Phosphine Oxide ◽  
Hydrobromic Acid ◽  
Analysis Method ◽  
Acid Media ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923

A systematic study of the solvent extraction of uranium(VI) and thorium(IV) from hydrobromic acid media was performed using the neutral phosphine oxide extractant Cyanex-923 in toluene. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the acidity range 5x10-5-1x10-4 M and 5x10-5-5x10-3 M, respectively, and they are stripped from the organic phase with 7.0 M HClO4 and 2.0- 4.0 M HCl, respectively. The effect of the equilibrium period, diluents, diverse ions and stripping agent on the extraction of U(VI) and Th(IV) was studied. The stoichiometry of the extracted species of these metal ions was determined based on the slope analysis method. The extraction reactions proceed by solvation and their probable extracted species found in the organic phase were UO2Br2?2Cyanex-923 and ThBr4?2Cyanex-923. Based on these results, a sequential procedure for their separation from each other was developed.

scholarly journals Extraction and separation studies of Ga(III), In(III) and Tl(III) using the neutral organophosphorous extractant, Cyanex-923

2003 ◽  
Vol 68 (7) ◽  
pp. 581-591 ◽  
Author(s):  
S.D. Pawar ◽  
P.M. Dhadke
Keyword(s):  
Metal Ions ◽  
Organic Phase ◽  
Acidic Solution ◽  
Sequential Procedure ◽  
Analysis Method ◽  
Effect Of Ph ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923 ◽  
Ph Range

The neutral extractant, Cyanes-923 has been used for the extraction and separation of gallium(III), indium(III) and thallium(III) from acidic solution. These metal ions were found to be quantitatively extracted with Cyanex-923 in toluene in the pH range 4.5?5.5, 5.0?6.5 and 1.5?3.0 respectively, and from the organic phase they can be stripped with 2.0 mol dm-3 HNO3, 3.0 mol dm-3 HNO3 and 3.0 mol dm-3 HCl, respectively. The effect of pH equilibration period, diluents, diverse ions and stripping agents on the extraction of Ga(III), In(III) and Tl(III) has been studied. The stroichiometry of the extracted species of these metal ions was determined on the basis of the slope analysis method. The reaction proceed by solvation and the probable extracted species found were [MCl3. 3Cyanex-923]?[where M = Ga(III) or In(III)]?and [HTlCl4. 3Cyanex-923]. Based on these results a sequential procedure for the separation of Ga(III), In(III) and Tl(III) from each other was developed.

scholarly journals Extraction and Separation Study of Mo(VI) and W(VI) Using Organophosphorous Extractant

2015 ◽  
Vol 48 ◽  
pp. 87-94
Author(s):  
D.V. Chavan ◽  
S.D. Pawar
Keyword(s):  
Metal Ions ◽  
Ph Effect ◽  
Reagent Concentration ◽  
Analysis Method ◽  
Effect Of Ph ◽  
Sequential Methods ◽  
Extraction And Separation ◽  
Slope Analysis ◽  
Cyanex 923

Organophosphorous extractant, Cyanex-923, has been used for the extraction and separation of Mo(VI) and W(VI) is described. The extraction of the metal ions is studied as the function of several parameters such as effect of pH, effect of reagent concentration, stripping agents, diluents study and effect of diverse ion. It was observed that Cyanex-923 extracts Mo(VI) at pH 2.5-4.5 while W(VI) was extracted at pH 0.5-1.5. The extracted Mo(VI) was stripped back using 0.1M NaOH, while W(VI) was stripped back using 1.0 M (NH4)2CO3. The stoichiometry of the extracted species of Mo(VI) and W(VI) was determined on the basis of slope analysis method. Based on the results sequential methods of separation of both the metals were developed.

Solvent Extraction of Zinc from Acidic Calcium Chloride Solutions by Cyanex 923

2000 ◽  
Vol 2000 (4) ◽  
pp. 188-189 ◽  
Author(s):  
Susana Martínez ◽  
Francisco José Alguacil
Keyword(s):  
Experimental Data ◽  
Solvent Extraction ◽  
Calcium Chloride ◽  
Phosphine Oxide ◽  
Zinc Chloride ◽  
Chloride Ions ◽  
Extraction Mechanism ◽  
Chloride Solutions ◽  
Slope Analysis ◽  
Cyanex 923

The reaction of zinc chloride with Cyanex 923 (phosphine oxide) in Solvesso 100 has been studied from acidic calcium chloride solutions. The distribution coeffient of zinc is independent of equilibrium pH, thus, suggesting a solvation extraction mechanism. Experimental data indicate that the reaction is exothermic (Δ H° = −55.2 kJmol−1). Slope analysis for the system at various Cyanex 923 concentrations reveals the formation in the loaded organic phases of species which probable 1:2 (Zn: Cyanex 923) stoichiometries. The stoichiometric factor of water in the extraction reaction was found to be 0, 1 or 2, whereas experimental data indicated that two chloride ions are involved for each metal extracted.

Extraction Studies of Lanthanum(III) from Sodium Salicylate Medium Using Trialkyl Phosphine Oxide

2015 ◽  
Vol 54 ◽  
pp. 143-149
Author(s):  
S.D. Pawar
Keyword(s):  
Metal Ion ◽  
Sodium Salicylate ◽  
Analysis Method ◽  
Extraction And Separation ◽  
Salicylate Concentration ◽  
Slope Analysis ◽  
Cyanex 923 ◽  
Loaded Organic Phase ◽  
Trialkylphosphine Oxide ◽  
Hcl Solution

Cyanex-923, a mixture of four trialkylphosphine oxide has been used for the extraction and separation of La(III) from sodium salicylate medium. Lanthanum(III) ion was found to be quantitatively extracted with Cyanex-923 in toluene at pH 6.0. The metal loaded organic phase is stripped with 2.0M HCl solution. Various parameters like effect of pH, Cyanex-923 concentration, sodium salicylate concentration, diluents, equilibration period and stripping agent on the extraction of La(III) has been studied. The stoichiometry of the extracted species of this metal ion was determined on the basis of the slope analysis method. The reaction proceed by solvation and the probable extracted species found were LaSal-HSal .2Cyanex-923.

Synthesis of a Novel Dibenzylamide Derivative of p-tert-Octylcalix[4]arene and its Extraction Properties Towards Noble Metal Ions

2017 ◽  
Vol 70 (5) ◽  
pp. 450 ◽  
Author(s):  
Jee Young Kim ◽  
Yoga Priastomo ◽  
Shintaro Morisada ◽  
Hidetaka Kawakita ◽  
Keisuke Ohto ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Metal Ions ◽  
Contact Time ◽  
Nitric Acid Concentration ◽  
Precious Metals ◽  
Extractant Concentration ◽  
Acid Media ◽  
Slope Analysis ◽  
Extraction Properties

A N,N-dibenzylacetoamide derivative of p-tert-octylcalix[4]arene was synthesised and its solvent extraction of precious metals in nitric acid media was investigated for determining the effects of extractant concentration and contact time as well as nitric acid concentration in comparison with a N,N-diethylacetoamide derivative. The extraction properties with both derivatives exhibited a slight difference. The extraction reaction of divalent palladium with both derivatives is discussed by slope analysis. The stripping behaviour of the extractant loaded with silver and palladium is also described using various stripping solutions.

Solvent extraction of uranium(VI) and thorium(IV) from nitrate media by Cyanex 923

2000 ◽  
Vol 88 (1) ◽  
Author(s):  
S.K. Sahu ◽  
M.L.P. Reddy ◽  
T.R. Ramamohan ◽  
V. Chakravortty
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Aqueous Phase ◽  
Organic Phase ◽  
Metal Ion ◽  
Theoretical Methods ◽  
Extraction Behaviour ◽  
Cyanex 923 ◽  
Inorganic Ligands ◽  
Nitrate Solutions

The extraction behaviour of uranium(VI) and thorium(IV) from nitrate solutions has been investigated using Cyanex 923 (TRPO) in xylene as an extractant. The extraction data have been analyzed by both graphical and theoretical methods by taking into account complexation of the metal ion in the aqueous phase with inorganic ligands and all plausible complexes extracted into the organic phase. The results demonstrate that these metal ions are extracted into xylene as Th(NO

EXTRACTION AND SEPARATION OF SOME 3d TRANSITION METAL IONS USING CYANEX 923

2002 ◽  
Vol 20 (1) ◽  
pp. 81-96 ◽  
Author(s):  
Bina Gupta ◽  
Akash Deep ◽  
Poonma Malik ◽  
S. N. Tandon
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Extraction And Separation ◽  
Cyanex 923

scholarly journals Molten solvent extraction behavior of palladium with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone at 60 °C

2007 ◽  
Vol 5 (3) ◽  
pp. 912-921 ◽  
Author(s):  
Bo Peng ◽  
Xiaojun Guo ◽  
Xuefen Mao ◽  
Jinzhang Gao
Keyword(s):  
Solvent Extraction ◽  
Precious Metal ◽  
Extraction Efficiency ◽  
Equilibrium Temperature ◽  
Paraffin Wax ◽  
Analysis Method ◽  
Extractant Concentration ◽  
Slope Analysis ◽  
Extraction Behavior ◽  
Ph Range

AbstractThe solvent extraction behavior of precious metal palladium with 1-phenyl-3-methyl-4-benzoyl-5-pyrazone (PMBP) into molten paraffin wax has been studied in the temperature range from 55 to 75 °C. The complex consisting of PMBP and palladium was extracted into molten wax phase in the pH range from 1.0 to 3.5 at 60 °C. The extraction efficiency was up to 97% at the experimental pH. The stoichiometry of the extracted species of palladium was determined on the basis of slope analysis method. The effects of time to achieve equilibrium, temperature, and extractant concentration on the extraction were discussed. The thermodynamic data indicate that the extraction is an endothermic reaction and the increase of temperature promotes the extraction of palladium into molten paraffin wax and the extraction of palladium with PMBP is entropy controlled at high temperatures.

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