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Thiodiphenol-Based n-Dialkylamino Extractants for Selective Platinum Group Metal Separation from Automotive Catalysts
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-01-27 00:00:00 , DOI: 10.1021/acs.iecr.7b05009
Manabu Yamada , Muniyappan Rajiv Gandhi , Yu Kaneta , Nozomi Kimura , Hiroshi Katagiri 1
Affiliation  

Five kinds of dialkylamino-modified thiodiphenols (26) were synthesized to elucidate the extraction of Pd(II) and Pt(IV) in HCl media by thiodiphenol-based n-dialkylamino extractants. Although the synthesized species 26 showed good solubility in hydrocarbon-based diluents such as kerosene, ShellSol D70, and ISOPAR M, the addition of n-octanol to the platinum group metals (PGMs) extraction was needed to inhibit third layer formation. All the 26 extract Pd(II) and Pt(IV) were much more effective than the commercial extractants, 2-hydroxy-5-nonylacetophenone oxime (LIX84-I), tri-n-butylphosphate (TBP), and tri-n-octylamine (TOA). Increasing the hydrophobicity of the extractants by increasing the alkyl chain length had an effect on the Pd(II), Pt(IV), and Rh(III) extractabilities, which increased in the order from 2 to 6. Extractant 6 could also be used for the selective extraction of Pd(II) and Pt(IV) (E% > 99%) from the leach liquors of automotive catalysts containing Pd(II), Pt(IV), Rh(III), La(III), Ce(III), Y(III), Zr(IV), Ba(II), and Al(III) in HCl media. The effective stripping of Pd(II) and Pt(IV) was achieved from an extracted organic phase containing 6 using 0.5 M thiourea in 1.0 M HCl. In addition, 6 was reusable and exhibited a high E% for Pd(II) and Pt(IV) (>96%) after five extraction cycles, indicating potential usefulness for the selective recovery of Pd(II) and Pt(IV) from leachates in platinum group metal refineries.

中文翻译:

基于噻二酚的正二烷基氨基萃取剂,可从汽车催化剂中选择性分离铂族金属

五种二烷基氨基改性thiodiphenols的(2 - 6)的合成以阐明的Pd(II)和Pt(IV)的在HCl介质通过硫代二苯酚为基础的提取Ñ二烷基氨基萃取。虽然合成的物种2 - 6表明在基于烃的稀释剂如煤油,D70名ShellSol,和ISOPAR M时,加入的良好的溶解性Ñ辛醇到铂族金属需要(铂族金属)萃取以抑制第三层的形成。所有26提取物Pd(II)和Pt(IV)均比市售提取剂2-羟基-5-壬基苯乙酮肟(LIX84-I),tri- n更有效。磷酸丁酯(TBP)和三正辛胺(TOA)。通过增加烷基链长度来增加萃取剂的疏水性对Pd(II),Pt(IV)和Rh(III)的萃取能力有影响,其萃取力从26依次增加。萃取剂6也可以用于Pd所构成的选择性提取(II)和Pt(IV)(Ë从含Pd汽车催化剂的浸出液%> 99%)(II),铂(IV),铑(III), La(III),Ce(III),Y(III),Zr(IV),Ba(II)和Al(III)在HCl介质中。使用1.0 M HCl中的0.5 M硫脲从含有6的萃取有机相中有效去除Pd(II)和Pt(IV)。另外,6可重复使用,并在五个萃取循环后对Pd(II)和Pt(IV)表现出较高的E%(> 96%),表明从铂族浸出液中选择性回收Pd(II)和Pt(IV)具有潜在的实用性金属精炼厂。
更新日期:2018-01-27
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