Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Separation Of Trivalent Lanthanides And Actinides By Solvent Extraction Without Aqueous Complexing Agents
Download Separation Of Trivalent Lanthanides And Actinides By Solvent Extraction Without Aqueous Complexing Agents full books in PDF, epub, and Kindle. Read online Separation Of Trivalent Lanthanides And Actinides By Solvent Extraction Without Aqueous Complexing Agents ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Separation of Trivalent Lanthanides and Actinides by Solvent Extraction Without Aqueous Complexing Agents by :
Download or read book Separation of Trivalent Lanthanides and Actinides by Solvent Extraction Without Aqueous Complexing Agents written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A method of separating the trivalent actinides, mainly Am and Cm, from trivalent lanthanides is presented. This method embodies the sequential use of two different solvent extractants; the first extractant would remove the heavy lanthanides from the lighter lanthanides and Am--Cm, while the second would extract Am--Cm in preference to the lighter lanthanides. In this scheme, no additional complexing agents are required. Thus, waste disposal and corrosion problems are minimized. Overall separation factors for Am--Cm from lanthanide fission products in reactor wastes may be as high as several thousand. (auth).
Book Synopsis Solvent Extraction Separation of Trivalent Lanthanide and Actinide Ions Using an Aqueous Aminomethanediphosphonic Acid by :
Download or read book Solvent Extraction Separation of Trivalent Lanthanide and Actinide Ions Using an Aqueous Aminomethanediphosphonic Acid written by and published by . This book was released on 1998 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The possibility of separating the trivalent lanthanides, represented by EU{sup 3+}, and actinides, represented by Cf{sup 3+}, using HDEHP in toluene and an aqueous phase containing N-piperidinomethane-1,1-diphosphotic acid, PMDPA, has been investigated. This modified aqueous phase offers potential advantages over the diethylenetriaminepentaacetic acid based TALSPEAK process because of the improved complexation properties of PMDPA in acidic solutions, and the ability to decompose PMDPA before disposal. Extraction experiments were conducted at 25 C in 2 M NaClO4 between -log [H] 1 and 2. The studies enabled us to derive the aqueous phase speciation, the stability constants of the aqueous complexes, and the Cf/Eu separation factors. Despite the presence of an amino group in PMDPA that should favor the retention of the actinides in the aqueous phase, the Cf/Eu separation factors are near unity under the conditions studied.
Book Synopsis Innovative SANEX process for trivalent actinides separation from PUREX raffinate by : Michał Sypuła
Download or read book Innovative SANEX process for trivalent actinides separation from PUREX raffinate written by Michał Sypuła and published by Forschungszentrum Jülich. This book was released on 2014-03-27 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recycling of nuclear spent fuel and reduction of its radiotoxicity by separation of long-lived radionuclides would definitely help to close the nuclear fuel cycle ensuring sustainability of the nuclear energy. Partitioning of the main radiotoxicity contributors followed by their conversion into short-lived radioisotopes is known as partitioning and transmutation strategy. To ensure efficient transmutation of the separated elements (minor actinides) the content of lanthanides in the irradiation targets has to be minimised. This objective can be attained by solvent extraction using highly selective ligands that are able to separate these two groups of elements from each other. The objective of this study was to develop a novel process allowing co-separation of minor actinides and lanthanides from a high active acidic feed solution with subsequent actinide recovery using just one cycle, so-called innovative SANEX process. The conditions of each step of the process were optimised to ensure high actinide separation efficiency. Additionally, screening tests of several novel lipophilic and hydrophilic ligands provided by University of Twente were performed. These tests were aiming in better understanding the influence of the extractant structural modifications onto An(III)/Ln(III) selectivity and complexation properties. ...
Book Synopsis Advanced Aqueous Separation Systems for Actinide Partitioning by :
Download or read book Advanced Aqueous Separation Systems for Actinide Partitioning written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most challenging aspects of advanced processing of used nuclear fuel is the separation of transplutonium actinides from fission product lanthanides. This separation is essential if actinide transmutation options are to be pursued in advanced fuel cycles, as lanthanides compete with actinides for neutrons in both thermal and fast reactors, thus limiting efficiency. The separation is difficult because the chemistry of Am3+ and Cm3+ is nearly identical to that of the trivalent lanthanides (Ln3+). The prior literature teaches that two approaches offer the greatest probability of devising a successful group separation process based on aqueous processes: 1) the application of complexing agents containing ligand donor atoms that are softer than oxygen (N, S, Cl- ) or 2) changing the oxidation state of Am to the IV, V, or VI state to increase the essential differences between Am and lanthanide chemistry (an approach utilized in the PUREX process to selectively remove Pu4+ and UO22+ from fission products). The latter approach offers the additional benefit of enabling a separation of Am from Cm, as Cm(III) is resistant to oxidation and so can easily be made to follow the lanthanides. The fundamental limitations of these approaches are that 1) the soft(er) donor atoms that interact more strongly with actinide cations than lanthanides form substantially weaker bonds than oxygen atoms, thus necessitating modification of extraction conditions for adequate phase transfer efficiency, 2) soft donor reagents have been seen to suffer slow phase transfer kinetics and hydro-/radiolytic stability limitations and 3) the upper oxidation states of Am are all moderately strong oxidants, hence of only transient stability in media representative of conventional aqueous separations systems. There are examples in the literature of both approaches having been described. However, it is not clear at present that any extant process is sufficiently robust for application at the scale necessary for commercial fuel processing supporting transmutation of transplutonium elements. This research project continued basic themes investigated by this research group during the past decade. In the Fuel Cycle Research and Development program at DOE, the current favorite process for accomplishing the separation of trivalent actinides from fission product lanthanides is the TALSPEAK process. TALSPEAK is a solvent extraction method (developed at Oak Ridge National Lab in the 1960s) based on the combination of a cation exchanging extractant (e.g., HDEHP), an actinide-selective aminopolycarboxylate complexing agent (e.g., DTPA), and a carboxylic acid buffer to control pH in the range of 3-4. Considerable effort has been expended in this research group during the past 8 years to elaborate the details of TALSPEAK in the interest of developing improved approaches to the operation of TALSPEAK-like systems. In this project we focused on defining aggregation phenomena in conventional TALSPEAK separations, on supporting the development of Advanced TALSPEAK processes, on profiling the aqueous complexation kinetics of lanthanides in TALSPEAK relevant aqueous media, on the design of new diglycolamide and N-donor extractants, and on characterizing cation-cation complexes of pentavalent actinides.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 1292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies Into New Solvent Extraction Reagents for the Separation of Trivalent Minor Actinides from Trivalent Lanthanides by : Mark Lyndon Russell
Download or read book Studies Into New Solvent Extraction Reagents for the Separation of Trivalent Minor Actinides from Trivalent Lanthanides written by Mark Lyndon Russell and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transplutonium Elements by : Charles E. Stuber
Download or read book Transplutonium Elements written by Charles E. Stuber and published by . This book was released on 1977 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Energy Research and Development Administration. Technical Information Center Publisher : ISBN 13 : Total Pages :1118 pages Book Rating :4.3/5 (129 download)
Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration. Technical Information Center
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Progress in Actinides Separation Chemistry by : Zenko Yoshida
Download or read book Recent Progress in Actinides Separation Chemistry written by Zenko Yoshida and published by World Scientific. This book was released on 1997 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book brings together some of the latest developments in solution chemistry and separation chemistry of f-block elements, which include (i) new solvent extraction systems and extractants for the separation of actinide and lanthanide elements, (ii) novel approach for fundamental solution chemistry study of solvent extraction reactions, and (iii) separation methods of new principle for f-block elements."--Publisher's website.
Book Synopsis Radioactive Waste Processing and Disposal by : U.S. Nuclear Regulatory Commission
Download or read book Radioactive Waste Processing and Disposal written by U.S. Nuclear Regulatory Commission and published by . This book was released on 1980 with total page 948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Solvent Extraction Separation of Trivalent Actinides from Lanthanides Using Aliquat 336-SCN by : Paul Vernon Beum
Download or read book The Solvent Extraction Separation of Trivalent Actinides from Lanthanides Using Aliquat 336-SCN written by Paul Vernon Beum and published by . This book was released on 1993 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974-03 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Studies for Optimization and Design of Extracting Agents for Separation of Lathanides and Actinides by : Deborah Andrea Penchoff
Download or read book Computational Studies for Optimization and Design of Extracting Agents for Separation of Lathanides and Actinides written by Deborah Andrea Penchoff and published by . This book was released on 2014 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare earths and actinides are of great interest given their varied applications in energy conversion and storage, such as in catalysis and batteries, and for advanced technological applications related to optical and magnetic properties (including electronics and automotive), amongst others. Many of the rare earth elements are considered endangered species due to their unique properties which have no clear alternatives that will maintain performance for important applications. The optimal approach is to find readily available alternatives for critical materials to ensure a certain standard of living and quality of life for future generations, but it is very likely that reusing and recycling of endangered elements will be required. Computational methods are a key component in the search for less costly separation processes and in optimizing known separation methods, which could ultimately lead to reusing and recycling endangered elements, and for finding alternatives for critical materials. Optimization of separation processes is needed not only for separations of rare earths, but also for separations of actinides. Separating uranium from seawater has recently become an area of interest due to the large amount of uranium found in seawater, which exceeds the amount found on the Earth’s crust. Actinide separation is also required in the processing of radioactive waste, and is therefore necessary to fully realize the contribution of nuclear energy to an economy based on clean energy. Computational techniques can be enormously helpful in optimizing and designing separation agents to aid in the separation process of lanthanides and actinides. The chapters included in this dissertation seek to contribute to the understanding of complexation of lanthanides and actinides with different complexing agents, through in-depth computational studies. The material presented in Chapter II focuses on contributing to the understanding of the mechanism involved in solvent extraction of lanthanides with carboxylic acids. In particular, Chapter II studies possible conformations involved in the formation of the coordination shell and the determination of preferred coordination numbers. Chapter III studies effects of beta diketones with different substituents as extracting agents. Chapter IV focuses on providing better understanding of selective extraction of uranium, neptunium, plutonium, and americium with imide dioximes.
Book Synopsis Nuclear Engineering Handbook by : Kenneth D. Kok
Download or read book Nuclear Engineering Handbook written by Kenneth D. Kok and published by CRC Press. This book was released on 2016-10-03 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building upon the success of the first edition, the Nuclear Engineering Handbook, Second Edition, provides a comprehensive, up-to-date overview of nuclear power engineering. Consisting of chapters written by leading experts, this volume spans a wide range of topics in the areas of nuclear power reactor design and operation, nuclear fuel cycles, and radiation detection. Plant safety issues are addressed, and the economics of nuclear power generation in the 21st century are presented. The Second Edition also includes full coverage of Generation IV reactor designs, and new information on MRS technologies, small modular reactors, and fast reactors.
Book Synopsis ERDA Research Abstracts by : United States. Energy Research and Development Administration
Download or read book ERDA Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Separations of f Elements by : Gregory R. Choppin
Download or read book Separations of f Elements written by Gregory R. Choppin and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: The symposium which provided the incentive for this volume was conducted in San th Diego, California as a part of the 207 National Meeting of the American Chemical Society, March 13-17, 1994. It was conceived partly to continue an informal decennial sequence of sym posia dedicated to the topic off element separations. A lot has changed in the world of f ele ments over the last ten years, precipitating a change in emphasis which should be evident to most practitioners in the field. Production and reprocessing of nuclear fuels are no longer the principal drivers of f element separation technology. Separations technology for environment restoration, waste disposal, and the preparation of high purity lanthanides are now the defming parameters in this important field. These imperatives are reflected in the contributions to this volume. The symposium itself must be considered a success, as the attendance at all sessions was above expectations, despite the fact that it was conducted on the last two days of a large five day meeting. Our thanks to the speakers for their quality presentations, and to the audience who persevered to the end of a long meeting and against the temptation of the excellent weather of San Diego in the springtime. A complete list of symposium participants is given in Appendix 1. Preparation of this volume has been a relatively painless undertaking, largely as a result ofthe high quality ofthe submitted papers.
