Kinetic and stability studies on phenol and vanillin facilitated transport through a Supported Liquid Membrane (SLM)
The objective of this study is to develop a supported liquid membrane (SLM) system containing a mixture of solvating extractant (tributyl phosphate (TBP)) and suitable organic solvent (kerosene) for the treatment of liquid solutions involving phenol or vanillin. Previous studies of liquid-liquid extraction (LLE) have been conducted to determine the feasibility of phenol and vanillin extraction through a MLS process. The complexing properties of TBP were studied in LLE as well as in the transport through a SLM. On the other hand, the use of TBP- kerosene mixture as organic phase leads to a quantitative extraction of phenol and vanillin. Experimental study results of phenol facilitated transport through a SLM show that the best transport performance was accomplished with a source aqueous solution at pH 2 and receiving aqueous solution of 0.2 M NaOH knowing that the transport efficiency decreases with time during five days of continuous operation. The study of vanillin facilitated transport through a SLM containing TBP- kerosene mixture has also been described. The optimum extraction of vanillin was accomplished using 20 % TBP (v/v) in kerosene as organic membrane mixture, an aqueous source at pH 1 and a receiving aqueous solution of 0.5M NaOH. The extraction efficiency of vanillin was stable at around 63% with the developed SLM system for 5 days of continuous run.
C. ZIDI, A. JAMRAH