화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.17, No.2, 243-247, March, 2011
DOI10.1016/j.jiec.2011.02.013  Export Citation
Separation of concentrated platinum(IV) and rhodium(III) in acidic chloride solution via liquid.liquid extraction using tri-octylamine
Attasak Jaree†, and Nuttakhun Khunphakdee
  • Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Chatuchak, Bangkok 10900, Thailand
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This research dealt with the intensification of Pt-Rh separation via liquid-liquid extraction (LLE). The stock solution contained Pt(IV) and Rh(III) at high concentration level in hydrochloric solution: 625 ppm and 104 ppm, respectively. Tri-octylamine (TOA) in toluene was used as an extractant. For single stage extraction, the separation factor was 135 with 8 wt% TOA. The percentage of extraction was 97% for Pt(IV) and 21% for Rh(III). Soybean oil as a solvent in LLE provided good extraction performance comparable to that of toluene. Pt(IV) was almost completely removed from the organic phase when stripped by 8 M nitric acid. Multi-stage extraction with direct recycling of organic phase after stripping significantly decreased the separation factor to 13 during the 5th stage. When the organic phase was washed with 1 M NaOH prior to be used in the next extraction stage, the separation factor increased to 818 during the 5th stage. Finally, the Pt-Rh continuous separation process scheme is presented.
Keywords:PGM recovery;Liquid.liquid extraction/stripping;Trioctylamine;Pt(IV);Rh(III)
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