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Supercritical Carbon Dioxide Extraction of Uranium from Acidic Medium Employing Calixarenes
- Source :
- Separation Science and Technology. 48:644-651
- Publication Year :
- 2013
- Publisher :
- Informa UK Limited, 2013.
-
Abstract
- Various calixarenes were evaluated for the supercritical fluid extraction of uranium from nitric acid medium. The extraction efficiency was found to be affected by various parameters, namely pressure, temperature, CO2 flowrate, extraction time, and molarity of nitric acid. The addition of HPFOA (pentadecafluoro-n-octanoic acid) for the production of CO2-phillic fluorinated counter ion enhanced the extraction efficiency. Under optimized conditions (pressure of 200 atm, temperature of 323 K, 30 minutes of static time followed by 30 minutes of dynamic time, CO2 flowrate of 2 mL min−1, nitric acid molarity of 0.1 M) for uranium: calixarene: HPFOA mole ratio of 1:5:10, highest extraction efficiency could be obtained with p-tert.-butyl calix[6]arene (79.9%). Solvent extraction study with hexane as the organic phase indicated the formation of [UO2 (calixarene)]2+. In order to assess the suitability of the developed method to extract uranium in the presence of a host of other ions, extraction efficiency for other...
- Subjects :
- Molar concentration
Supercritical carbon dioxide
Process Chemistry and Technology
General Chemical Engineering
Extraction (chemistry)
Inorganic chemistry
Supercritical fluid extraction
chemistry.chemical_element
Filtration and Separation
General Chemistry
Uranium
Hexane
chemistry.chemical_compound
chemistry
Nitric acid
Calixarene
Subjects
Details
- ISSN :
- 15205754 and 01496395
- Volume :
- 48
- Database :
- OpenAIRE
- Journal :
- Separation Science and Technology
- Accession number :
- edsair.doi...........e76c3255bd631f72bc58f19700e7501d