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Extractive removal of zinc(II)from chloride liquors with phosphonium ionic liquids/toluene mixtures as novel extractants

机译:用phospho离子液体/甲苯混合物作为新型萃取剂从氯化物溶液中萃取去除锌(II)

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摘要

Trihexyl(tetradecyl)phosphonium chloride(Cyphos~RIL 101)and bis(trifluoromethylsulphonyl)imide(Cyphos~RIL 109)-phosphonium ionic liquids-were used as novel reagents mixed with toluene to extract zinc(II)from chloride media.Extraction of zinc(II)was very fast and efficient(E_(Zn)over 95%)for molar ratio of Cyphos~RIL 101/Zn(II)more than 2.It was found that the presence of HC1 in the feed enhanced Zn(II)extraction.The reactions of Zn(II)extraction mechanism were proposed.The values of DELTA H° were estimated to be 32.93(standard deviation(s.d.)=2.81)and 52.85(s.d=1.90)kJ mol~(-1)and AS° amounted to 120.65(s.d.= 8.84)and 182.13(s.d.= 6.02)Jmol~(-1)K~(-1)for reaction without HC1 and with 0.58 M acid,respectively.The extraction of zinc(II)with Cyphos~RIL 101/toluene mixture is an endothermic reaction.Successful stripping of zinc(II)from the loaded organic phase was achieved with 1M sulphuric acid.Cyphos~RIL 101 can be reused at least in 3 cycles of extraction-stripping process.Due to low extraction of Zn(II)Cyphos~RIL 109 cannot be considered as effective extractant in the studied system.
机译:氯化三(十四烷基)phosph(Cyphos〜RIL 101)和双(三氟甲基磺酰基)亚胺(Cyphos〜RIL 109)-phosph离子液体被用作与甲苯混合的新型试剂,从氯化物介质中提取锌(II)。 Cyphos〜RIL 101 / Zn(II)的摩尔比大于2时,(II)非常快速有效(E_(Zn)超过95%),发现进料中HC1的存在增强了Zn(II)提出了Zn(II)萃取机理的反应,ΔH°值分别为32.93(标准偏差(sd)= 2.81)和52.85(sd = 1.90)kJ mol〜(-1)和AS °分别为120.65(sd = 8.84)和182.13(sd = 6.02)Jmol〜(-1)K〜(-1),分别与HCl和0.58 M的酸反应.Cyphos〜 RIL 101 /甲苯混合物是一个吸热反应,使用1M硫酸成功地从负载的有机相中汽提了锌(II),Cyphos〜RIL 101至少可以在萃取-汽提过程的3个循环中重复使用。前Zn(II)Cyphos〜RIL 109的牵引力不能视为研究体系中的有效萃取剂。

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