Selective Palladium(II) Recovery Using a Polymer Inclusion Membrane with Tris(2-ethylhexyl) Phosphate (TEHP). Experimental and Theoretical Study,Industrial & Engineering Chemistry Research

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Selective Palladium(II) Recovery Using a Polymer Inclusion Membrane with Tris(2-ethylhexyl) Phosphate (TEHP). Experimental and Theoretical Study
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-02-19 , DOI: 10.1021/acs.iecr.0c05074
Minerva Monroy-Barreto ₁ , Ana Nelly Bautista-Flores ₂ , Nadia M. Munguia Acevedo ₁ , Eduardo Rodriguez de San Miguel ₁ , Josefina de Gyves ₁

Affiliation

Extraction and recovery of palladium continues to be a technologically and economically challenging task, particularly in the recycling process of palladium from scrap automotive catalytic converters. In this work, extraction and transport of palladium(II) from HCl media with and without KSCN in the feed and/or in the stripping solutions by tris(2-ethylhexyl) phosphate (TEHP) and tris(2-ethylhexyl) phosphate (TEHP)–triisobutylphosphine sulfide (CYANEX 471X) mixture were studied in two- (liquid and membrane extraction) or three-phase (polymer inclusion membrane, PIM) configurations. Regarding PIMs, the efficiency factors (permeability, selectivity, and stability) were determined. Numerical data analysis revealed that the transport of palladium is achieved by a complex mechanism in which the solvating effects of TEHP and TEHP–CYANEX 471X are coupled to chloride ion co-transport and thiocyanic acid counter-transport. Palladium recovery from a spent automotive catalytic converter was accomplished (approximately 90%) with excellent separation from Pt(IV), Fe(III), Al(III), and other components via the studied membrane systems.

中文翻译：

使用具有三（2-乙基己基）磷酸酯（TEHP）的聚合物包裹膜选择性回收钯（II）。实验与理论研究

钯的提取和回收仍然是一项技术和经济上的挑战性任务，尤其是在从废旧汽车催化转化器中回收钯的过程中。在这项工作中，在进料和/或汽提溶液中，在含或不含KSCN的HCl介质中，通过磷酸三（2-乙基己基）酯和磷酸三（2-乙基己基）酯萃取和运输钯（II））-三异丁基膦硫化物（CYANEX 471X）混合物以两相（液相和膜萃取）或三相（聚合物夹杂膜，PIM）配置进行了研究。关于PIM，确定了效率因子（渗透率，选择性和稳定性）。数值数据分析表明，钯的转运是通过复杂的机制实现的，其中TEHP和TEHP-CYANEX 471X的溶剂化作用与氯离子的共转运和硫氰酸的逆转运耦合。通过研究的膜系统可实现从废汽车催化转化器中回收钯（约90％），并与Pt（IV），Fe（III），Al（III）和其他组分实现极佳的分离。

更新日期：2021-03-03

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