Separation of homogeneous palladium catalysts from pharmaceutical industry wastewater by using synergistic recovery phase via HFSLM system

Separation of homogeneous palladium catalysts from pharmaceutical industry wastewater by using synergistic recovery phase via hollow fiber supported liquid membrane (HFSLM) system is presented. HFSLM impregnated with N-methyl-N,N,N-trioctylammonium chloride (Aliquat 336) as the extractant dissolved in cyclohexane. The influence of various chemical parameters, including the concentration of extractant and recovery phases as well as recovery selector concentration in recovery phase, were also studied. A mixture of hydrochloric acid and thiourea was used as synergistic recovery phase. The highest percentage of extraction and recovery was 99.95% and 88.12%, respectively. Furthermore, the kinetics of recovery reaction was studied to provide reaction order, reaction rate constant, equilibrium constant and distribution ratio. (C) 2021 The Author(s). Published by Elsevier B.V.

Automated summary

This study successfully separated homogeneous palladium catalysts from pharmaceutical industry wastewater using a synergistic recovery phase via the HFSLM system. Various chemical parameters were studied to optimize recovery efficiency, achieving extraction and recovery percentages of up to 99.95% and 88.12% respectively. The kinetics of the recovery reaction were also analyzed to provide important reaction information.