화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.89, 428-435, September, 2020
DOI10.1016/j.jiec.2020.06.015  Export Citation
Highly selective extraction of palladium from spent automotive catalyst acid leachate using novel alkylated dioxa-dithiacrown ether derivatives
Rey Eliseo C. Torrejos, Grace M. Nisola, Sang Hoon Min1, Jeong Woo Han2, Seong-Poong Lee†, and Wook-Jin Chung†
  • Department of Energy Science and Technology (DEST), Myongji University Yongin Science Campus, 17058, South Korea
  • 1Department of Chemical Engineering, University of Seoul, 02504, South Korea
  • 2Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, South Korea
E-mail:,
Novel macrocyclic extractants were synthesized and employed in liquid.liquid extraction (LLE) for palladium/platinum (Pd/Pt) separation in aqueous feed source. Dioxadithia-benzo-crown ether diols (BCES2O2) 2g-2i were prepared through bis-epoxide cyclization with aqueous 1,2-benzenedithiol under mild basic conditions. For improved miscibility and stability in the organic diluent (i.e. toluene), 2g-2i were alkylated to afford dimethoxy-BCES2O2 3g.3i. LLE experiments reveal their high stability, extraction efficiency, and separation performance (βPd2+/Pt2þ+ = 10 4 - 10 5) in highly acidic feed solutions (~6 M HCl). The most suitable extractant 3i followed a 1:1 3i Pd2+ complex with stability constant Kex ~10 5. Density functional theory calculations reveal that the rigid cavity size (1.58-1.65 A) of 3i is ideal for Pd2+ (1.56 A) in forming S4 coordination geometry. The Pd2+ can be repeatedly extracted by 3i [in toluene] and stripped by 1 M HCl + 0.15 M thiourea solution without performance deterioration. Each cycle can be accomplished <1 h based on the derived extraction (kex = 0.038 min-1) and stripping (kstrip = 0.063 min-1) rate constants. The high extraction efficiency (99.5%) and purity (98.5%) of recovered Pd2+ from simulated acidic spent automobile catalyst liquor demonstrate the potential of 3i [in toluene] LLE system for selective Pd2+ recovery from automotive wastes.
Keywords:Crown ether;Liquid.liquid extraction;Palladium recovery;Separation;Spent automobile catalyst
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