A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol
Reprocessing of spent nuclear fuel usually employs the solvent extraction technique to recover fissile material, isolate other valuable radionuclides, recover precious metals, and remove contaminants. Efficient recovery of these species from highly radioactive solutions requires a detailed understan...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Sciendo
2015-12-01
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| Series: | Nukleonika |
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| Online Access: | https://doi.org/10.1515/nuka-2015-0154 |
| _version_ | 1819275679877824512 |
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| author | Knight Andrew W. Eitrheim Eric S. Nelson Andrew W. Schultz Michael K. |
| author_facet | Knight Andrew W. Eitrheim Eric S. Nelson Andrew W. Schultz Michael K. |
| author_sort | Knight Andrew W. |
| collection | DOAJ |
| description | Reprocessing of spent nuclear fuel usually employs the solvent extraction technique to recover fissile material, isolate other valuable radionuclides, recover precious metals, and remove contaminants. Efficient recovery of these species from highly radioactive solutions requires a detailed understanding of reaction conditions and metal speciation that leads to their isolation in pure forms. Due to the complex nature of these systems, identification of ideal reaction conditions for the efficient extraction of specific metals can be challenging. Thus, the development of experimental approaches that have the potential to reduce the number of experiments required to identify ideal conditions are desirable. In this study, a full-factorial experimental design was used to identify the main effects and variable interactions of three chemical parameters on the extraction of protactinium (Pa). Specifically we investigated the main effects of the anion concentration (NO3-, Cl-) extractant concentration, and solution acidity on the overall extraction of protactinium by 2,6-dimethyl-4-heptanol (diisobutylcarbinol; DIBC) from both HCl and HNO3 solutions. Our results indicate that in HCl, the extraction of protactinium was dominated by the solution acidity, while in nitric acid the extraction was strongly effected by the [DIBC]. Based on our results, a mathematical model was derived, that describes the relationship between concentrations of anions, extractant, and solution acidity and the expected values of Pa distribution coefficients in both HCl and HNO3. This study demonstrates the potential to predict the distribution coefficient values, based upon a mathematical model generated by a full-factorial experimental design. |
| first_indexed | 2024-12-23T23:28:10Z |
| format | Article |
| id | doaj.art-d2f1b7562d6e4d939619fe6a83615bea |
| institution | Directory Open Access Journal |
| issn | 0029-5922 |
| language | English |
| last_indexed | 2024-12-23T23:28:10Z |
| publishDate | 2015-12-01 |
| publisher | Sciendo |
| record_format | Article |
| series | Nukleonika |
| spelling | doaj.art-d2f1b7562d6e4d939619fe6a83615bea2022-12-21T17:26:10ZengSciendoNukleonika0029-59222015-12-0160483784510.1515/nuka-2015-0154nuka-2015-0154A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanolKnight Andrew W.0Eitrheim Eric S.1Nelson Andrew W.2Schultz Michael K.3Department of Chemistry, E373 CB, The University of Iowa, Iowa City, IA 52246, USADepartment of Chemistry, E373 CB, The University of Iowa, Iowa City, IA 52246, USAInterdisciplinary Human Toxicology Program, E373 CB, The University of Iowa, Iowa City, IA 2246, USADepartment of Chemistry, E373 CB, The University of Iowa, Iowa City, IA 52246, USA and Interdisciplinary Human Toxicology Program, E373 CB, The University of Iowa, IA 52246, USA and Departments of Radiology and Radiation Oncology (Free Radical and Radiation Biology Program), The University of Iowa, ML B180 FRRB, 500 Newton Road, Iowa City, IA 52246, USA, Tel.: +1 319 335-8017Reprocessing of spent nuclear fuel usually employs the solvent extraction technique to recover fissile material, isolate other valuable radionuclides, recover precious metals, and remove contaminants. Efficient recovery of these species from highly radioactive solutions requires a detailed understanding of reaction conditions and metal speciation that leads to their isolation in pure forms. Due to the complex nature of these systems, identification of ideal reaction conditions for the efficient extraction of specific metals can be challenging. Thus, the development of experimental approaches that have the potential to reduce the number of experiments required to identify ideal conditions are desirable. In this study, a full-factorial experimental design was used to identify the main effects and variable interactions of three chemical parameters on the extraction of protactinium (Pa). Specifically we investigated the main effects of the anion concentration (NO3-, Cl-) extractant concentration, and solution acidity on the overall extraction of protactinium by 2,6-dimethyl-4-heptanol (diisobutylcarbinol; DIBC) from both HCl and HNO3 solutions. Our results indicate that in HCl, the extraction of protactinium was dominated by the solution acidity, while in nitric acid the extraction was strongly effected by the [DIBC]. Based on our results, a mathematical model was derived, that describes the relationship between concentrations of anions, extractant, and solution acidity and the expected values of Pa distribution coefficients in both HCl and HNO3. This study demonstrates the potential to predict the distribution coefficient values, based upon a mathematical model generated by a full-factorial experimental design.https://doi.org/10.1515/nuka-2015-0154design of experimentsprotactiniumsolvent extraction |
| spellingShingle | Knight Andrew W. Eitrheim Eric S. Nelson Andrew W. Schultz Michael K. A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol Nukleonika design of experiments protactinium solvent extraction |
| title | A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol |
| title_full | A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol |
| title_fullStr | A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol |
| title_full_unstemmed | A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol |
| title_short | A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol |
| title_sort | calculation model for liquid liquid extraction of protactinium by 2 6 dimethyl 4 heptanol |
| topic | design of experiments protactinium solvent extraction |
| url | https://doi.org/10.1515/nuka-2015-0154 |
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