Development of a homogeneous/heterogeneous metal recovery system based on reversible association/dissociation between tris(2-aminoethyl)amine and 1,4-bis(hexafluoro-α-hydroxyisopropyl)benzene
| Autor: | Shogo Imai, Daisuke Nagai |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010405 organic chemistry
Hydrogen bond Chemistry Metal ions in aqueous solution Inorganic chemistry Filtration and Separation Tris(2-aminoethyl)amine 010402 general chemistry 01 natural sciences Dissociation (chemistry) Cycloaddition 0104 chemical sciences Analytical Chemistry Catalysis chemistry.chemical_compound Polymer chemistry Amine gas treating Bond cleavage |
| Zdroj: | Separation and Purification Technology. 177:1-7 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2016.12.019 |
| Popis: | We developed a novel metal recovery system that facilitates homogeneous coordination for metal recovery and then becomes heterogeneous, allowing separation after the recovery, based on reversible association/dissociation between tris(2-aminoethyl)amine (denoted as tren) and 1,4-bis(hexafluoro-α-hydroxyisopropyl)benzene (1,4-bisHFAB). Metal solution containing the tren/1,4-bisHFAB association complex is homogeneous at high temperature due to the scission of hydrogen bonds, which results in efficient coordination of tren to the metal ions. After coordination, the solution is heterogenized by cooling, which results in the regeneration of hydrogen bonds, and the mixture can be separated by filtration. The recovery behavior of Pd(OAc)2 and CuBr(PPh3)3 using this system was examined, and the recovery efficiencies were found to be high (PdII: 100% and CuI: 100%). The system also allowed the recovery of Pd(OAc)2 and CuBr(PPh3)3 catalysts after Suzuki-Miyaura coupling and Huisgen cycloaddition, respectively (PdII: 100% and CuI: 100%). |
| Databáze: | OpenAIRE |
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