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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Exploiting supramolecular chemistyr in metal recovery:movel zwitterionic extractants for nickel(II) salts
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Exploiting supramolecular chemistyr in metal recovery:movel zwitterionic extractants for nickel(II) salts

机译:利用超分子化学技术回收金属:两性离子镍镍盐萃取剂

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Hexadentate tris-salicyladimine lignads bearing ortho-N-dialkylaminomethyl substituents have been shown to function as ditopic ligands for NiSO_4 or NiCl_2.The incorporation of the Ni-ion into the N_3O_3~3- site templates the pendant alkylammonium groups to allow them to hydrogen bond to the attendant anion(s).Formulation as complexes of the trianionic/tricationic ligand is supported by X-ray structure determinations of solvated froms of the complexes [Ni(L)SO_4][Ni(L)Cl]Cl,where L=tris-1,1,1-{2-hydroxy-3-(piperidin-1-ylmethyl)-5-tert-butyl-benzaldiminomethyl}ethane.the kerosene-soluble ligand,tris-2,2',2in-{2-hydroxy-3-(di-n-hexylaminomethyl)-5-nonylbenzaldiminomethyl} amine,functions as a good extractant for nickel salts,showin ghigh selectivity for recovery of NiCl_2 over NiSO_4.This reagent can be stripped and recycled directly using aqueous ammonia or by first dsplacing the Ni~2+ with acid and then neutralising the pendant alkylammonium groups.The acid-stripping is accompanied opening up novel flowsheets for nickel recovery,based on transport of the metal salt as opposed to ion-exchange based processes.
机译:已显示带有邻-N-二烷基氨基甲基取代基的六齿三水杨基亚胺直链烷醇可作为NiSO_4或NiCl_2的二位配体.Ni离子掺入N_3O_3〜3-位模板中,烷基侧基侧基允许氢键键合通过X射线结构测定配合物[Ni(L)SO_4] [Ni(L)Cl] Cl的溶剂化形式来支持三阴离子/三价配体配合物的形成,其中L = tris-1,1,1- {2-羟基-3-(哌啶-1-基甲基)-5-叔丁基-苯并二氨基甲基}乙烷。煤油可溶性配体,tris-2,2',2in- {2 -羟基-3-(二-正己基氨基甲基)-5-壬基苯甲二氨基甲基}胺,可作为镍盐的良好萃取剂,与NiSO_4相比具有较高的回收NiCl_2的选择性。可通过氨水或氨水直接汽提和再循环该试剂。首先用酸取代Ni〜2 +,然后中和烷基铵侧基。基于金属盐的运输,而不是基于离子交换的方法,完善用于镍回收的新型流程。

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