DOCSLIB.ORG

Highly Hydrated Associate of Tributyl Phosphate in Dodecane

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Highly Hydrated Associate of Tributyl Phosphate in Dodecane ANALYTICAL SCIENCES AUGUST 1994, VOL. 10 607 Highly Hydrated Associate of Tributyl Phosphate in Dodecane Hirochika NAGANAWA and Shoichi TACHIMORI Department of Fuel Cycle Safety Research, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-11, Japan The hydration and association of tributyl phosphate (TBP) in dodecane were investigated on the basis of the water distribution between aqueous solutions and TBP-dodecane solutions at 298 K. The water distribution data were analyzed as functions of the TBP concentration in the organic phase and the water activity in the aqueous phase. A highly hydrated TBP trimer was found in the organic phase at high TBP concentrations by the data analysis. At [TBP]org,totat~ 0.02 mol dm-3, no TBP association occurred and only TBP •H2O formed as a unique hydrate. In the range of 0.02 mol dm-3 < [TBP]org,totaic 0.3 mol dm-3, a part of the monohydrate dimerized to form (TBP)2(H20)2. At [TBP]org,total>0.3 mol dm-3, trimerization also occurred at high water activities. The trimer was found to be hydrated with six water molecules, (TBP)3(H20)6. Keywords Tributyl phosphate, hydration, highly hydrated associate The distribution of water between aqueous solutions and tributyl phosphate (TBP)-dodecane solutions has Experimental been the subject of numerous studies in the nuclear fuel- reprocessing industry. The subject has been discussed Preparation from the viewpoint of complex-formation between TBP All of the reagents were of reagent grade. TBP and water, and many complexes have been suggested solutions diluted with dodecane were washed several previously.)-14 Monomeric TBP monohydrate, TBP • times with a 1 mol dm 3 sodium hydroxide solution, then H2O, was supposed in most such studies.)-1o However, with a 0.1 mol dm 3 nitric acid solution, and finally with there is no definite answer regarding other complex- deionized-distilled water. Lithium chloride (purity> formations. 99.0%) and dodecane (purity 99.3%) were used without In the present study, hydration and the association of further purification. TBP were investigated stoichiometrically. The data concerning the water distribution were analyzed as Distribution of water functions of the TBP concentration in the organic phase A portion of water, or an aqueous lithium chloride and the water activity in the aqueous phase. In the solution, and the same volume of a TBP-dodecane calculations, the association number of TBP and the solution were placed in a stoppered glass tube. The two hydration number for the associates were treated as phases were vigorously agitated for 15 min and then unknown values. centrifuged in a chamber thermostated at 298 K. The In the range of TBP concentrations up to 0.3 mol dm3 concentration of water extracted into the organic phase in dodecane, the hydration and dimerization of TBP was measured by Karl-Fischer titration. had been shown in a previous study in our laboratory.15 However, in the reprocessing industry, a TBP solution Co-extraction of water with LiCI--.TBPcomplexes that is much more concentrated, i.e., 30vol% TBP Lithium chloride was added to the liquid-liquid system (1.1 mol dm 3), has been used. At the higher TBP in order to decrease the water activity in the aqueous concentration, successive complicated TBP-water com- phase (a'). Although this inorganic salt distributes low plexation occurs. In the present study, the water in the organic phase, the concentration of water co- distribution was examined over an extended TBP extracted with LiCI-TBP complexes is not negligible at concentration range up to 1.5 mol dm 3 in dodecane (40 extremely high concentrations of the aqueous salt. For vol% TBP). By analyzing the data, a highly hydrated instance, when [LiCI]aq,total>6.2mol dm3, that is, a'<0.6, TBP trimer, (TBP)3(H20)6, was found in addition to the water co-extraction has to be taken into account at TBP •H2O and (TBP)2(H20)2, in the higher TBP concen- [TBP]org,totalhigher than 0.3 mol dm 3. tration range. The highly hydrated trimer was sup- The concentration of the salt actually extracted was posed to be a kind of ring polymer. also checked by means of ion chromatography using 608 ANALYTICAL SCIENCES AUGUST 1994, VOL. 10 K22 [(TBP)2(H20)2]0 a 2.5X103 mol dm-3 aqueous potassium hydrogen- (2) Kl l phthalate solution as an eluent; a portion of the organic [TBP •H2O]o ' phase was shaken with water, and the concentration of salt back-extracted into the aqueous phase was measured where by ion chromatography. While taking note of the relation between the amount of the salt and of water K 22 _ [(TBP)2(H20)2]0TBP extracted into the organic phase, the conditions under ah 2•aW (3) which the water co-extraction with salt complexes can be neglected were chosen in the experiments. Formation of highly hydrated TBP associates When the TBP concentration is higher than 0.3 mol dm 3, other TBP hydrates can form in addition to Theoretical TBP•H20 and (TBP)2(H20)2. The equilibrium can be written as: Hydration and dimerization of TBP The formation of the TBP monomer monohydrate1S mTBP(ah)(0) + nH2O (TBP)m(H20)n(0), can be written as: [(TBP)m(H20)n]0 K mn- TBP TBP(ah)(0) + H2O TBP•H20(0), ah o •aW K [TBP•H20]0 11_ [TBP( (m-1,2,3,..., n=1,2,3,...). (4) ah)]o•a ' (1) The following mass balances can be written as: w where the subscript "o" denotes the species in the organic phase, while the lack of subscript denotes those in the [TBP]0,t = [TBP(ah)]0 + [TBP • H20]0 aqueous phase, TBP(ah) is the anhydrous TBP monomer + 2[(TBP)2(H20)2]0 and aw is the water activity in the aqueous phase; aw=1 + (m[(TBP)m(H20)n]0) for pure water. m=] n=l The monomer monohydrate can dimerize in the = (1+ K1i • aW)[TBP(ah)]0 organic phase15, which can be written as: + 2K22• aW• [TBP(ah)]l 2TBP•H20(0) (TBP)2(H20)2(0), + (m • Kmn• aW• [TBP(ah)J ), m=1 n=1 (5) Fig. 1 The concentration of water extracted by TBP as a function of the total TBP concentration in the organic phase: (a) 0.005 mol dm-3 < [TBP]0,t <_0.02 mol dm-3, (b) 0.02 mol dm-3 < [TBP]0,t < 0.3 mol dm-3, (c) 0.3 mol dm-3 <_[TBP]0,t <_ 1.5 mol dm-3. Calculated lines: (......) only TBP • H2O was taken into account; (-----) TBP •H2O and (TBP)2(H20)2 were taken into account; ( ) TBP•H2O, (TBP)2(H20)2 and (TBP)3(H20)6 were taken into account. These lines were calculated by using equilibrium constants shown in Table 2. ANALYTICAL SCIENCES AUGUST 1994, VOL. 10 609 [H2O]0,t= [H20(free)]0 + [H20]0,E obtained precisely to be 3.06(±0.55), 6.02(±0.88) and = [H20(free)]0+ [TBP•H20]0 0.037(±0.007), respectively. The analysis assuming two additional complexes was also made. No combination + 2[(TBP)2(H20)2]0 of two different additional complexes gave a standard + A deviation better than that obtained in the analysis n= 1(n [(TBP)m(H20)n]0) assuming the sole additional complex of (TBP)3(H20)6. = (KfW+ K11• [TBP(ah)] 0)aW Then, the resulting standard deviation from assuming two additional complexes was rather worse. From + 2K22• aW• [TBP(ah)]o these, no additional complexes other than (TBP)3(H20)6 + (n • Kmn• aW • [TBP(ah)]o ), (6) were found practically in the analyses. m=1 n=1 where [H20]0,E is the concentration of water extracted Stoichiometry for TBP water complexation along with the extractant of TBP. KfWis the distribution By the addition of TBP at high concentration to constant of free water: KfW=[H2O(free)]0/aW. dodecane, the activity coefficient of TBP could be On the basis of Eqs. (5) and (6), the data of [H2O]0,t changed from unity, and, thus, the equilibria for the free can be analyzed as functions of [TBP]0,t and aW by a water distribution and TBP-water complexation could successive-approximation method using a least-squares be apparently changed. In order to appraise this, both computer program. the equilibrium constants and their errors were deter- mined at individual TBP concentrations by analyzing the water-distribution data as a function of aW. When the Results TBP concentration in dodecane is constant, the medium of the organic phase can be uniform. In such a uniform Formation of highly hydrated TBP associates medium, the values of KfW,K11, K22 and K36 can be Figures 1(a), 1(b) and 1(c) give the water distribution as regarded as being constants. Figures 2(a), 2(b) and 2(c) a function of the TBP concentration in dodecane: (a) give the distribution of water as a function of aWat (a) 0.005 mol dm 3 < [TBP]0,t <_0.02 mol dm 3, (b) 0.02 mol [TBP]0,t=0.005, 0.01 and 0.02 mol dm 3, (b) [TBP]0,t= dm-3 < [TBP]0,t <_ 0.3 mol dm-3, (c) 0.3 mol dm-3 0.02, 0.05, 0.1 and 0.3 mol dm 3, (c) [TBP]0,t=0.5, 0.7, [TBP]0,t<_ 1.5 mol dm 3. The values of aWwere calcu- 0.9,1.1,1.3 and 1.5 mol dm-3, respectively.
Load more

Recommended publications
  • Chemical Resistance List
    Chemical Resistance List Resistance Substance Permeation Time/Level to Degradation Fluoro- natural chloro- nitrile/ nitrile carbon butyl latex prene chloroprene rubber NR CR CR NBR FKM IIR NR NR CR CR NBR NBR NBR NBR NBR FKM IIR IIR NBR NBR 395 450, 451 720, 722 717 727 730, 732 740, 741 743 754 764 890 897 898 chemical physical 403 706 723, 725 733, 836 742, 757 state 708 726 736 - 739 759 - 0 - 0 0 + 1-methoxy-2-propanol paste 4 2 2 3 4 4 B 1 3 4 6 6 - 0 - 0 0 + 1-methoxy-2-propyl acetate liquid 3 1 1 3 3 A B 2 3 6 6 - 0 0 - 0 + 1-methyl-2-pyrrolidone liquid 5 2 3 3 3 2 A B 1 3 3 6 6 - 0 + + + - 1,1,2-trichlorotrifluoroethane liquid 1 0 5 4 6 6 1 1 2 1 6 1 2 - - - - - - 1.2-epoxy ethane (ethylene oxide) liquid B A A A A 0 0 0 B 1 2 - - - - - - 1.2-epoxy propane (propylene oxide) liquid B A A A 1 A 0 0 0 B 1 2 + + + + + + 1.2-propanediol liquid 6 6 6 6 6 6 6 6 6 6 6 6 6 - + - + + 0 2-ethyl hexyl acrylate liquid 2 1 1 5 6 1 1 2 6 2 3 - 0 0 0 + + 2-mercaptoethanol liquid 3 2 4 4 4 4 1 1 3 6 6 6 - - - 0 0 - 2-methoxy-2-methyl propane liquid 1 B B 2 4 A 1 4 1 3 2 2 - - - - - 0 3-hexanone liquid 1 B 1 1 1 0 0 0 0 0 3 3 - - - - - 0 4-heptanone liquid 1 A 1 1 1 A 0 0 0 B 3 3 - - - - - + acetaldehyde liquid 1 1 1 1 B 0 0 0 A 0 6 6 0 0 0 - - + acetic acid anhydride liquid 6 3 3 3 3 2 A B 1 B 2 6 6 + + + + + + acetic acid, 10 % liquid 6 6 6 6 6 6 6 6 6 6 6 6 6 0 + + + + + acetic acid, 50 % liquid 5 4 6 6 6 2 4 6 6 6 6 - - - - 0 + acetic acid, conc.
    [Show full text]
  • TRI.N.BUTYL PHOSPHATE
    This report contains the collective views of an in- ternational group of experts and does not necessarily represent the decisions or the stated policy of the United Nations Environment Programme, the Interna- tional Labour Organisation, or the World Health Organization. Environmental Health Cnteria ll2 TRI.n.BUTYL PHOSPHATE Published under the joint sponsorshipof the United Nations Environment Programme, the International Labour Organisation, and the World Health Organization First draft prepared by Dr A. Nakamura, National Institute for Hygienic Sciences,Japan World Health Organization Geneva,1991 The International Progranne on Chemical Safety (IPCS) is a joint venture of the United Nations Environment Programme, the International Labour Organisation, and the World Health Organization. The main objec- tive of the IPCS is to carry out and disseminate evaluations of the effects of chemicals on human health and the quality of the environ- ment. Supporting activities include the development of epidemiological, experimental laboratory, and risk-assessment methods that could produce internationally comparable results, and the development of manpower in the field of toxicology. Other activities carried out by the IPCS include the development of know-how for coping with chemical accidents, coordination of laboratory testing and epidemiological studies, and promotion of research on the mechanisms of the biological action of chemicals. WHO Library Cataloguing in Publication Data Tri-n-butyl phosphate. (Environmental health criteria ; l12) l. Phosphoric acid esters - adverse effects 2. Phosphoric acid esters - toxicity I. Series rsBN92 4 r57rr2 8 (NLM Classification: QV 627) rssN0250-863X @World Health Organization l99l Publications of the \ilorld Health Organization enjoy copyright pro- tection in accordance with the provisions of Protocol 2 of the Univer- sal Copyright Convention.
    [Show full text]
  • Interagency Committee on Chemical Management
    DECEMBER 14, 2018 INTERAGENCY COMMITTEE ON CHEMICAL MANAGEMENT EXECUTIVE ORDER NO. 13-17 REPORT TO THE GOVERNOR WALKE, PETER Table of Contents Executive Summary ...................................................................................................................... 2 I. Introduction .......................................................................................................................... 3 II. Recommended Statutory Amendments or Regulatory Changes to Existing Recordkeeping and Reporting Requirements that are Required to Facilitate Assessment of Risks to Human Health and the Environment Posed by Chemical Use in the State ............................................................................................................................ 5 III. Summary of Chemical Use in the State Based on Reported Chemical Inventories....... 8 IV. Summary of Identified Risks to Human Health and the Environment from Reported Chemical Inventories ........................................................................................................... 9 V. Summary of any change under Federal Statute or Rule affecting the Regulation of Chemicals in the State ....................................................................................................... 12 VI. Recommended Legislative or Regulatory Action to Reduce Risks to Human Health and the Environment from Regulated and Unregulated Chemicals of Emerging Concern ..............................................................................................................................
    [Show full text]
  • Tributyl Phosphate Cas N°: 126-73-8
    OECD SIDS TRIBUTYL PHOSPHATE FOREWORD INTRODUCTION TRIBUTYL PHOSPHATE CAS N°: 126-73-8 UNEP PUBLICATIONS 1 OECD SIDS TRIBUTYL PHOSPHATE SIDS Initial Assessment Report for 12th SIAM (Paris, France June 2001) Chemical Name : Tributyl Phosphate CAS No: 126-73-8 Sponsor Country: U.S.A National SIDS Contact Point in Sponsor Country: US EPA Dr. Oscar Hernandez (7403M) ICC Building 1200 Pennsylvania Avenue, N.W. Washington, DC 20460 U.S.A. e-mail: [email protected] phone: 202-564-7641 HISTORY: First time considered for a SIAM. No new testing was performed. All available data was provided from company files and public databases. COMMENTS: An IPCS document is available for this chemical. IPCS Environmental Health Criteria Document No. 112, WHO, 1991. Deadline for circulation: Date of Circulation: April 2001 (updated March 2002) 2 UNEP PUBLICATIONS OECD SIDS TRIBUTYL PHOSPHATE SIDS INITIAL ASSESSMENT PROFILE CAS No. 126-73-8 Chemical Name Tributyl phosphate Structural Formula (C4H9O)3PO RECOMMENDATIONS The chemical is a candidate for further work under conditions specified below. SUMMARY CONCLUSIONS OF THE SIAR Human Health The toxicology database for tributyl phosphate (TBP) is large and well documented. There are adequate data with which to evaluate the potential hazard to human health of this compound. Acute oral toxicity values in rodents range from 1390 to 3350 mg/kg-bw in rats and from 400 to 1240 mg/kg-bw in mice. A rat six-hour LC50 of > 4.2 mg/L (highest dose tested) was reported. Dermal studies exist in rabbits (LD50s of >3100 mg/kg-bw and > 10,000 mg/kg-bw) and in guinea pigs (LD50 of 9700 – 19,400 mg/kg-bw).
    [Show full text]
  • Hand Protection
    HAND PROTECTION CHEMICAL This table provides only general information. Be careful ! Glove resist- ance is influenced by other factors such as temperature, chemical RESISTANCE TABLE product concentration, thickness, immersion time, and others. For specific use conditions, we recommend testing the glove prior to use. n°CAS Natural latex Neoprene Nitrile vinyl PVC n°CAS Natural latex Neoprene Nitrile vinyl PVC 20% nitric acid 7697-37-2 ** ** * * Isobutyl alcohol 78-83-1 *** *** *** *** 30% and 5% hydrochloric acid 7647-01-0 *** *** *** ** Isobutyl ketone / *** *** 30% formaldehyde 50-00-0 *** *** *** *** Kerosene / * *** * 30% hydrofluoric acid 7664-39-3 ** *** *** ** Lard oil / *** *** * 50% acetic anhydride / *** *** *** *** Linseed oil / *** *** * 85% lactic acid / * *** *** *** Lubricating oils / * *** * 85% triethanolamine 102-71-6 *** *** *** *** Magnesia 1309-48-4 *** *** *** *** 90% formic acid 64-18-6 *** * * Methyl acetate 79-20-9 * *** * * Acetaldehyde 75-07-0 *** *** * Methyl alcohol (or methanol) 67-56-1 *** *** *** *** Acetone 67-64-1 *** ** Methyl ethyl ketone / *** ** Alcoholic beverages / *** *** *** *** Methyl isobutyl ketone / ** * Ammonium acetate 631-61-8 *** *** *** *** Methyl salicylate 119-36-8 *** *** *** *** Ammonium carbonate 10361-29-2 *** *** *** *** Methylamine 74-89-5 *** ** *** *** Ammonium chloride 12125-02-9 *** *** *** *** Methylaniline 100-61-8 * * *** *** Amyl acetate / *** Methylcyclopentane 96-37-7 * *** * Amyl alcohol 71-41-0 *** *** *** *** Methylene chloride 75-09-2 ** Aniline 62-53-3 ** ** * Methylformiate
    [Show full text]
  • Nitric Acid-Tributyl Phosphate- Supercritical Carbon Dioxide System
    Investigation of the Uranimn(VI)-Nitric Acid-Tributyl Phosphate- Supercritical Carbon Dioxide System by Barbara Gauthier, B.Sc. Thesis submitted to the Faculty of Graduate Studies and Research in partial fulfilment of the requirements for the degree of Master of Science Department of Chemistry Carleton University Ottawa, Ontario June 24,2006 © Copyright 2006, B. Gauthier Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Library and Bibliotheque et Archives Canada Archives Canada Published Heritage Direction du Branch Patrimoine de I'edition 395 Wellington Street 395, rue Wellington Ottawa ON K1A 0N4 Ottawa ON K1A 0N4 Canada Canada Your file Votre reference ISBN: 978-0-494-18363-2 Our file Notre reference ISBN: 978-0-494-18363-2 NOTICE: AVIS: The author has granted a non­ L'auteur a accorde une licence non exclusive exclusive license allowing Library permettant a la Bibliotheque et Archives and Archives Canada to reproduce, Canada de reproduire, publier, archiver, publish, archive, preserve, conserve, sauvegarder, conserver, transmettre au public communicate to the public by par telecommunication ou par I'lnternet, preter, telecommunication or on the Internet,distribuer et vendre des theses partout dans loan, distribute and sell theses le monde, a des fins commerciales ou autres, worldwide, for commercial or non­ sur support microforme, papier, electronique commercial purposes, in microform, et/ou autres formats. paper, electronic and/or any other formats. The author retains copyright L'auteur conserve la propriete du droit d'auteur ownership and moral rights in et des droits moraux qui protege cette these. this thesis. Neither the thesis Ni la these ni des extraits substantiels de nor substantial extracts from it celle-ci ne doivent etre imprimes ou autrement may be printed or otherwise reproduits sans son autorisation.
    [Show full text]
  • SEPARATION of TRIBUTYL PHOSPHATE from DEGRADED SOLVENTS USING SOLVENT EXTRACTION TECHNIQUE by 8, V,1 Kumar, M
    J3 B. A. R. C.-933 3 GOVERNMENT OF INDIA ATOMIC ENERGY COMMISSION SEPARATION OF TRIBUTYL PHOSPHATE FROM DEGRADED SOLVBNTS USING SOLVBNT EXTRACTION TECHNIQUE by S. V. Kumar, M N. Nadktrni. A. Ranunujtm, M. VeoktteMD, V. Gopalakrishnan and J. A. Kazi Fuel Reprocessing Division BHABHA ATOMtC RESEARCH CENTRE BOMBAY, INDIA 1977 B.A.R.C.-933 GOVERNMENT OF INDIA «n ATOMIC ENERGY COMMISSION SEPARATION OF TRIBUTYL PHOSPHATE FROM DEGRADED SOLVENTS USING SOLVENT EXTRACTION TECHNIQUE by 8, V,1 Kumar, M. N. Nadkaxni, A. Ramaxrajam, M. V«nkateian» V. Gopaiakrlahnan and X. A. Kasl Fual Reprocessing Dlrlalon BHABHA ATOMIC RESEARCH CENTRE BOMBAY, INDIA 1977 INIS Subject C*f ggrr i B12, B16 DmtcxjylkorBt PUREX PROCESS SOLVENT EXTRACTION MIXER-SETTLERS ACTIVATED CARBON CHARCOAJL THORtUM NITRATES TBP ABSTRACT A solvent extraction method is described for' the recovery of Tributyl Phosphate (TBP) from degraded process solvents. The method involves the separation of TBP and shall solT(SST) from 30% TBP/SSP mixture by thorium nitrate extraction leading to the formation of a heavy phase (Third phase) which contains osssntially TBP. The equilibrium experiments revsaled that by utilizing Thorium feeds of concentrations above 525 g/L. in water at 111 ratio, a 30% TBP/SST mixture can be effectively separated into TBP and SST fractions with light SST phase having about 3% TBP, Using single stage mixer settler experiments, the feasibility of continuous separation of the three phases was assessed. Since there is a tendency for the degraded products of the diluent to seek the TBP phase, additional treatment steps would be necessary for their removal if the TBP is to be reused.
    [Show full text]
  • Chemical Resistance Chart Version 11/2018 | PDF Only | Bürkert Applied Marketing & Design Applied Marketing 11/2018 | PDF Only Bürkert Version
    Chemical Resistance Chart Version 11/2018 | PDF only | Bürkert Applied Marketing & Design Applied Marketing 11/2018 | PDF only Bürkert Version Check chemical resistance online. Download our mobile resistApp for free: Click to start the resistApp! Bürkert Fluid Control Systems Christian-Bürkert-Straße 13 -17 74653 Ingelfingen Germany Tel.: +49 7940 10 0 Fax: +49 7940 10 91204 [email protected] www.burkert.com Introduction 3 Introduction When dealing with aggressive fluids the user is continuously faced with the problem of finding compatible materials. In order to simplify the selection of suitable materials when using Bürkert products for aggressive fluids, the following tables provide useful information on the optimal choice of housing and gasket materials for a multitude of media. Since corrosion performance is influenced by several factors, the information contained Content in this brochure should be treated only as a guide and is not necessarily valid for all op- erating conditions. Increased temperatures, higher concentrations, and the inadvertent 3 Introduction ingress of water in originally pure chemicals can all lead to accelerated corrosion. 4 Structure and content of the chemical resistance charts Dependent on the purity of the fluid as well as the compounding and nature of vulca- 5 Interpretation of Symbols nisation of the gasket materials, deviations can result which affect the suitability and durability of the plastics and elastomers. 5 References 6 Overview The information quoted in this guide does not consider the effect of mechanical load- ing, which may also have a bearing on the material performance in the fluid. In cases 8 Resistance in basic chemicals of doubt when considering our products, we strongly recommend the prior testing of 32 Resistance in commercial products samples with various material combinations, in order to establish and check their suit- ability under the actual operating conditions of the application.
    [Show full text]
  • Solvent Extraction of Uranium (VI) by Tributyl Phosphate/Dodecane From
    Ŕ periodica polytechnica Solvent extraction of uranium (VI) by Chemical Engineering tributyl phosphate/dodecane from nitric 51/2 (2007) 57–60 doi: 10.3311/pp.ch.2007-2.09 acid medium web: http://www.pp.bme.hu/ch c Periodica Polytechnica 2007 Moussa Alibrahim / Habib Shlewit RESEARCH ARTICLE Received 2005-10-19 Abstract 1 Introduction Uranium (VI) extraction from nitric acid medium by 20% Tri The purification of crude uranium from its ores at plant-scale Butyl Phosphate (TBP)/dodecane was carried out. The effects using tri butyl phosphate (TBP) started in the early 1950s in of the nature of the diluent and nitric acid concentration on ura- Canada and in the UK, then in the US in 1953 [1]. nium distribution ratio (Du) were investigated in this study. The Today, TBP extraction technology and processes are applied experimental results showed that Du using different diluents in- word-wide for uranium and thorium purification. Taichi Sato creases in the order: chloroform, carbon tetrachloride, dode- [2] studied the extraction of uranium (VI) from nitric acid so- cane and n-hexane. lutions using TBP. He found that 6 mol/dm3 nitric acid was the The yellow cake [Di-Ammonium Uranyl U2O7(NH4)2] pro- best concentration for uranium extraction. Moreover, he found 3 duced at the Uranium Recovery Pilot-Plant from the Syrian row that, 97% of uranium can be recovered from 6 mol/dm HNO3 phosphoric acid was used to carry out uranium extraction tests, solution containing less than 0.042 mol/dm3 uranium using using 20% TBP/dodecane. Results showed that impurities pre- 19%TBP/kerosene.
    [Show full text]
  • The Chemistry of Tributyl Phosphate at Elevated Fapact Temperatures in the Plutonium Finishing Plant Process Uc- Leve T S Q Vessels
    WHC-EP-0737 c The Chemistry of Tributyl I Phospha Approved for Public Release DISTRIBtmON OF THlS 00CUME:hn IS UNLIM[TED e LEGAL DISCLAIMER - This report has been reproduced Available in paper copy and micr P.O. Box 62 Oak Ridge, TN 37831 (615) 576-8401 Printed m *e United Wtes d Am I MSCUI-1.CHP (1.01) 1 . DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied. or assumes any legal liabiiity or rcspnsibility for the accuracy, completeness, or use- fulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any spe- cific commercial product, process, or service by trade name, trademark, manufac- tuum, or otherwise dots not necessarily constitute or imply its endorsement. ream- mendation. or favoring by the United State Government or any agency thereof. The views and opinions of authors exprrssed herein do not necessarily state or reflect thwe of the United States Government or any agency thereof. *- DISCLAIMER Portions- -__ of this document may be illegible in electronic image products. Images are produced from the best availabIe original document. fl Full Paper W TeduricalReport . U Manual t] Abstract a BmchunlFDer t] VtrwlAld fl Softwam/lJatabase Date Release Required fl SpeakenBuraau fl ContmlledDofumsnt [I Pocter&sslon fl Vldaotape a octwr March 11, 1994 Unclassified Category Title The Chemistry of Tributyl Phosphate at Elevated fapact Temperatures in the Plutonium Finishing Plant Process uc- Leve t S Q Vessels.
    [Show full text]
  • United States Patent (19) [11] 3,714,324 Weech (45) Jan
    United States Patent (19) [11] 3,714,324 Weech (45) Jan. 30, 1973 54 IRRADIATED FUEL RECOVERY Chemical Processing of Nuclear Fuels, F. S. Martin & SYSTEM G. L. Miles, Academic Press Inc., N.Y., 1958 pp. 105 75 Inventor: Marx E. Weech, Pico Rivera, Calif. & 08 (73) Assignee: General Electric Company Primary Examiner-Carl D. Quarforth Assistant Examiner-F. M. Gittes 22 Filed: June 18, 1968 Attorney-Ivor J. James, Jr., Samuel E. Turner, John (21) Appl. No.: 738,009 R. Duncan, Frank L. Neuhauser, Oscar B. Waddell and Melvin M. Goldenberg 52 U.S. Cl........................................ 23/341, 23/344 57 ABSTRACT (51 int. Cl. ............................................. B01d 11100 58 Field of Search......................... 23/341, 343, 344 An improved process for recovering irradiated nuclear reactor fuel material is disclosed. This process in cludes the steps of extracting uranium, plutonium and 56 References Cited neptunium from a solution of irradiated fuel, passing UNITED STATES PATENTS this stream to a reflux column, where a high saturation of uranium is maintained. Separation of uranium from 2,848,300 8/1958 Warf...................................... 23/341 plutonium and neptunium, and further decontamina 2,979,379 4/1961 Schmieding et al.................... 23/34 tion of uranium results from this high saturation. This 3,092,446 6/1963 Morgan et al.......................... 23.1341 process is simple, has a high recovery efficiency and 3,276,850 101966 Huet et al............................... 23.1341 high decontamination, uses relatively small amounts of 3,387,945 6, 1968 Boudry et al........................... 23/341 process reagents and produces a relatively small OTHER PUBLICATIONS volume of radioactive waste material.
    [Show full text]
  • UNIVERSITY of CALIFORNIA RIVERSIDE a Screening-Level
    UNIVERSITY OF CALIFORNIA RIVERSIDE A Screening-Level Hazard Assessment of Human and Environmental Health Endpoints of Halogenated and Organophosphate Flame Retardants A Thesis submitted in partial satisfaction of the requirements for the degree of Master of Science in Environmental Toxicology by Seth Rojello Fernández March 2019 Thesis Committee: Dr. David Eastmond, Chairperson Dr. Carl Cranor Dr. David Volz Copyright by Seth Rojello Fernández 2019 The Thesis of Seth Rojello Fernández is approved: Committee Chairperson University of California, Riverside Acknowledgments I would like to thank Dr. David Eastmond for his unwavering support and guidance during my progress towards this degree and as my major adviser. His expertise and know-how made this thesis possible. Even before I entered his research group he has been a genuine champion on my behalf. His door is always open for my ceaseless questions and wonderings. In his research group, I have grown as a scientist, a writer, a thinker, and as a person. For this, I cannot give enough thanks. I would like to thank the members of my thesis committee, Dr. Carl Cranor and Dr. David Volz for their commitment and flexibility as I have undergone this process. Also, for their unique viewpoints and expertise on the subject matter. I would like to thank my parents, Ivan and Melissa Fernández for their thoughts and prayers as I have gone through my educational career. They have been vital for my success and a place of comfort. They have supported me as I moved across the country and to other countries in the pursuit of knowledge.
    [Show full text]