Minimizing the environmental impact of the regeneration process of an ion exchange bed charged with transition metals

Purification of glycerol/water solutions from biodiesel synthesis by ion exchange: sodium removal Part I

“…Sodium ions are exchanged with protons initially on the resin until the resin exchange capacity is exhausted. Then, the spent resin is regenerated by using a concentrated acid solution 12–14. Thus, it is clear that for an optimized design of ion exchange fixed bed, one must be able to predict both the loading and regeneration processes.…”

Equilibrium Treatment for Highly Selective Sulfonated Microcapsules Containing Di(2-ethylhexyl)phosphoric Acid

“…Nevertheless, there is an important lack of information concerning the proper regenerant and its concentration. In a previous work, the minimizing of the environmental impact of the regeneration process using an ion exchange bed of Amberlite IR-120 charged with copper, zinc, and cadmium was studied . Different concentrations of NaCl were studied, ranging from 4 to 24 wt %, and it was found that 6 wt % seemed to be the optimal concentration.…”

“…In a previous work, the minimizing of the environmental impact of the regeneration process using an ion exchange bed of Amberlite IR-120 charged with copper, zinc, and cadmium was studied. 15 Different concentrations of NaCl were studied, ranging from 4 to 24 wt %, and it was found that 6 wt % seemed to be the optimal concentration. The results using HCl at the same concentration were closer but even faster.…”

“…Hydrochloric acid at 6 wt % was chosen as the regenerant agent according to our previous results. 15 It was selected because it demonstrated a high efficiency in the regeneration of strong acid cationic exchanger (Amberlite IR-120) loaded with Cu 2+ .…”

Métodos físicos e químicos para o tratamento de efluentes

“…Troca iônica O tratamento de águas residuárias pelo método de troca catiônica, principalmente as compostas por soluções diluídas, destaca-se por ser eficiente na remoção de íons e pela simplicidade e baixo custo em sua aplicação. Os principais fatores que influenciam este método são: tempo de contato entre o efluente e a resina, temperatura de operação, pH, taxa de fluxo, concentração inicial do efluente e propriedades da resina (Pintar et al, 2001;Valverde et al, 2006). A troca iônica também pode apresentar algumas limitações, dentre elas está o parâmetro pH, que precisa estar ajustado para ocorrer a troca iônica (Martins et al, 2017).…”