論文

査読有り
2012年12月1日

Extraction Equilibria of Palladium(II) and Platinum(IV) with N,N-Di(2-ethylhexyl)aminomethylquinoline from Hydrochloric Acid

Journal of chemical engineering of Japan
  • BABA Yoshinari
  • ,
  • ARIMA Akemi
  • ,
  • KANEMARU Shintaro
  • ,
  • IWAKUMA Minako
  • ,
  • OSHIMA Tatsuya

45
8
開始ページ
686
終了ページ
691
記述言語
英語
掲載種別
DOI
10.1252/jcej.10we284
出版者・発行元
公益社団法人 化学工学会

N,N-Di(2-ethylhexyl)aminomethylquinoline (DEQ) has been newly synthesized to develop selective extractants for precious metals. DEQ is designed so as to exhibit high selectivity for precious metals through the electrostatic force and coordination ability of the tertiary amine and quinoline moieties, respectively. DEQ in toluene exhibits a high selectivity for gold(III), palladium(II) and platinum(IV) over base metals such as copper(II), nickel(II) and cobalt(II) from hydrochloric acid. This is attributed to the strong basicity of the tertiary amine and high coordination ability of quinoline for precious metals. Palladium(II) and platinum(IV) extraction is significantly dependent on the concentration of hydrochloric acid, while gold(III) is quantitatively extracted over the whole concentration region of hydrochloric acid examined. We have quantitatively discussed the extraction equilibria of palladium(II) and platinum(IV) with DEQ in toluene from hydrochloric acid. It is observed that palladium(II) was extracted by the anion exchange mechanism, while platinum(IV) was extracted through the anion exchange and solvation mechanisms. Palladium(II) was extracted as a 1 : 1 complex formed by ion pair formation and coordination bonding, and its extraction equilibrium constant was determined as 1.28 × 107 [-]. Platinum(IV) was extracted as a 1 : 1 complex and a 1 : 2 complex at low and high concentrations of hydrochloric acid, respectively. These extraction equilibrium constants were determined as 4.15 × 102 [mol dm−3] and 3.46 × 104 [-], respectively.

リンク情報
DOI
https://doi.org/10.1252/jcej.10we284
CiNii Articles
http://ci.nii.ac.jp/naid/10031134143
CiNii Books
http://ci.nii.ac.jp/ncid/AA00709658
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000296098200003&DestApp=WOS_CPL
URL
https://jlc.jst.go.jp/DN/JALC/00380187087?from=CiNii
ID情報
  • DOI : 10.1252/jcej.10we284
  • ISSN : 0021-9592
  • CiNii Articles ID : 10031134143
  • CiNii Books ID : AA00709658
  • Web of Science ID : WOS:000296098200003

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