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Skrzypczak, A.
Funding organisation: Polish Committee of Scientific Research (Poland)
Proceedings of the 22. International Symposium on Physico-Chemical Methods of Separation - Ars Separatoria 20072007
Funding organisation: Polish Committee of Scientific Research (Poland)
Proceedings of the 22. International Symposium on Physico-Chemical Methods of Separation - Ars Separatoria 20072007
AbstractAbstract
No abstract available
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Source
Trochimczuk, A.W.; Walkowiak, W. (eds.); Wroclaw University of Technology, Wroclaw (Poland); Nicolaus Copernicus University, Torun (Poland); 217 p; ISBN 978-83-7493-317-9;
; 2007; p. 181; 22. International Symposium on Physico-Chemical Methods of Separation - Ars Separatoria 2007; Szklarska Poreba (Poland); 10-14 Jun 2007; Also available from Wroclaw University of Technology or Nicolaus Copernicus University

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[en] Full text of publication follows. To improve the recycling of nuclear fuel (as well as the reducing of the volume and the toxicity of ultimate waste), different actinide separations have been considered. Specific families of molecules were selected considering several criteria; among them the performance in terms of chemical affinity and selectivity towards the actinide target was important. The design and/or the optimization of new ligands could be improved with a deep understanding of actinides distribution and of the selectivity. N, N-dialkyl-amides RR'N-C(O)-R'' belong to a classical family of extractants which have been proposed some years ago to selectively separate uranium(VI) and plutonium(IV). The influence of the alkyl groups R, R' and R'' on the extraction and physico-chemical properties has already been discussed. But the relation between a macroscopic behavior of a solvent extraction system and the molecular contributions is difficult to obtain with high solute concentrations. In order to increase the knowledge in this field, a large number of investigations have been applied on the same extraction systems (3 reference dialkyl-amides): -) Thermodynamic data (free energy ΔextG0, enthalpy ΔextH0 and entropy ΔextS0) were acquired by the classical Van't Hoff method and by direct calorimetry to provide the enthalpies of extraction and also specific heats; -) Dedicated methods like electro-spray ionization mass spectrometry analysis and X-ray diffraction on single crystals provide information about the stoichiometry of the extracted species; -) Spectroscopic investigations with UV-visible absorption, Fourier transform infrared and XAS experiments combined with theoretical calculations probed the actinide coordination in the inner sphere. The results obtained will be discussed to identify the origin of the different affinities between ligands and the difference of selectivity between cations. (authors)
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Societe Francaise d'Energie Nucleaire - SFEN, 103 rue Reaumur, 75002 Paris (France); 2455 p; ISBN 978-1-4951-6286-2;
; 2015; p. 1646; GLOBAL 2015: Nuclear fuel cycle for a low-carbon future; Paris (France); 21-24 Sep 2015; Available (USB stick) from: SFEN, 103 rue Reaumur, 75002 Paris (France)

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[en] It is pointed out that hydrocarbons are widely used as diluents in solvent extraction processes involving a wide variety of metals and extracting agents of both the chelating and non-chelating types, and that the introduction of hydroxy oxime chelating type extractants and their application to large scale solvent extraction processes for metals has led hydrocarbon solvent manufacturers to consider the use of special purpose diluents. The manufacture, properties and uses of such diluents are reviewed. Sections are included on treatments to remove impurities, solvent blending, selectivity, kinetics of extraction and stripping, etc. Research and lines for future investigation are indicated. (U.K.)
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Source
Symposium organised by the Solvent Extraction and Ion Exchange Group of the Society of Chemical Industry; Bristol, UK; 22 May 1975
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Journal Article
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Conference
Journal
Chemistry and Industry (London); (no.5); p. 175-181
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[en] Quantitative extraction of uranium(VI) is observed from 0.2M HCl by 5% (v/v) Cyanex 301. The extraction decrease with increasing acid concentration. Mixtures of Cyanex 301 with tri-n-butyl phosphate (TBP), didecyl sulfoxide (DDSO) and Alamine 308 result in significant synergism in the extraction process, where a species of the type UO2R2 x L is proposed to be extracted to be extracted [RH = Cyanex 301 and L = TBP, DDSO or Alamine 308G. Significant extraction of uranium(VI) by 5% (v/v) Alamine 308 is observed at and above 2M HCl, which increases with further increase in acidity attaining a maximum at ∼ 6M, after a which a slight decrease in extraction is observed. Mixtures of Alamine 308 with TBP or DDSO result in a synergism, where a species of the type (R3'NH)2UO2Cl4 x L is extracted. [R3'N Alamine 308, L = TBP or DDSO]. Mixtures of Alamine 308 and Cyanex 301 at ≥ 2M HCl result in a profound antagonism in the extraction of uranium(VI). (author) 17 refs.; 5 figs.; 2 tabs
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Journal Article
Journal
Journal of Radioanalytical and Nuclear Chemistry; ISSN 0236-5731;
; CODEN JRNCDM; v. 181(1); p. 3-10

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Paiva, A.L.; Soares, P.S.M.; Masson, I.O.C., E-mail: psoares@cetem.gov.br
Proceedings of the 37. Brazilian Congress on Chemistry. Abstracts1997
Proceedings of the 37. Brazilian Congress on Chemistry. Abstracts1997
AbstractAbstract
No abstract available
Original Title
Extracao do erbio por solventes: um estudo preliminar
Primary Subject
Source
Associacao Brasileira de Quimica, Rio de Janeiro, RJ (Brazil); 320 p; 1997; p. 118; 37. Brazilian Congress on Chemistry; 37. Congresso Brasileiro de Quimica; Natal, RN (Brazil); 28 Sep - 3 Oct 1997; Available from the library of the Brazilian Nuclear Energy Commission, Rio de Janeiro
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Leveque, A.
Societe des Usines Chimiques Rhone-Poulenc, 94 - Vitry-sur-Seine (France)1989
Societe des Usines Chimiques Rhone-Poulenc, 94 - Vitry-sur-Seine (France)1989
AbstractAbstract
[en] The extracting agent comprises an organophosphonic acid or phosphinic acid but instead of paraffinic hydrocarbons as diluent halogenated hydrocarbons or carboxylic acid are claimed to improve reextraction of rare earths from the organic phase
[fr]
L'agent d'extraction utilise comprend un acide organophosphonique ou phosphinique mais au lieu d'utiliser comme diluant un hydrocarbure paraffinique, on a trouve que le rendement etait ameliore par l'emploi d'hydrocarbures halogenes ou d'acide carboxyliqueOriginal Title
Procede de separation des terres rares par extraction liquide-liquide mettant en oeuvre des diluants halogenes ou du type acides carboxyliques
Primary Subject
Source
13 Jan 1989; 10 Jul 1987; 6 p; FR PATENT DOCUMENT 2617829/A/; FR PATENT APPLICATION 8709796; Available from Institut National de la Propriete Industrielle, Paris (France); Application date: 10 Jul 1987
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Patent
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AbstractAbstract
[en] TECHXTRACT is a proprietary chemical decontamination technology employing as many as 25 different chemical components in three separate formulations that are used in sequence to extract contaminants
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Source
1 Dec 1998; 33 p; OST/TMS-ID--1450; Available from PURL: https://www.osti.gov/servlets/purl/767660-xlQYCh/native/
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Report
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[en] Ionic liquids are alternative reaction media of increasing interest and are regarded as an eco-friendly alternatives, of potential use in place of the volatile organic solvents typically used in current chemical processing methods. They are emerging as the smart and excellent solvents, which are made of positive and negative ions that they are liquids near room temperature. The nucleophilic substitution reaction is one of the important method for inserting functional groups into a carbon skeleton. Many nucleophilic substitution reactions have been found with enhanced reactivity and selectivity in ionic liquid. In this review, some recent interesting results of nucleophilic substitution reactions such as hydroxylations, ether cleavages, carbon-X (X = carbon, oxygen, nitrogen, fluorine) bond forming reactions, and ring opening of epoxides in ionic liquids are discussed
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Source
66 refs, 2 figs, 15 tabs
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Journal Article
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964;
; v. 27(3); p. 345-354

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AbstractAbstract
[en] Single-channel coaxial segments were used for the introduction of an aqueous or octan-1-ol solution of an organic substance directly into a continuous flow of the other solvent. The analytical signal was measured simultaneously on both aqueous and organic phase segments by an 'on-tube' fast-reading spectrophotometric detector (ca. 3 ms time resolution) and treated mathematically. The octan-1-ol-water phase signal ratio corresponds to the partition coefficient of the organic substances. The applicability of the method is demonstrated by the determination of partition coefficients of phenol, citric acid, acetylsalicylic acid and sodium salicylate. (author). 8 refs.; 3 figs.; 1 tab
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AbstractAbstract
No abstract available
Original Title
Extracao liquido-liquido por fase unica
Primary Subject
Source
33. Annual Meeting of the Brazilian Society for the Advancement of Science; Salvador, Brazil; 8 - 15 Jul 1981; Published in summary form only.
Record Type
Journal Article
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Conference
Journal
Ciencia e Cultura; ISSN 0009-6725;
; v. 33(7); p. 331

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