Comparison between facilitated transport through a supported liquid membrane (SLM) of phenol and vanillin extracted from aqueous solutions [Comparaison entre le transport facilité à travers une Membrane à Liquide Supporté (MLS) du phénol et de la vanilline extraits de milieux aqueux]

In the present work,the extraction of phenol or vanillin by liquid-liquid extraction (ell) procedure and by supported liquid membrane (slm) system using tributyl phosphate (tbp) has been explored. the extraction of phenol from acidic solution with mixtures of tbp and some selected organic solvents was studied by solvent extraction method. the most efficient organic solvent,the equilibration extraction time and the optimal concentration of tbp were determined. furthermore,the transport of phenol through a flat sheet supported liquid membrane (fsslm) containing a mixture of tbp-kerosene as liquid membrane has been investigated. complete stripping was achieved using aqueous naoh solution. the stability of the membrane system used was also investigated in continuous run showing 5 days stability. this paper presents also an experimental study on the extraction of vanillin from aqueous solutions through a fsslm system. thereby,the best organic solvent and the operating conditions that would yield optimum performance of the developed slm system have been identified. tbp is used as carrier. among various solvents,tested for the above purpose,kerosene is found to be the best. the effects of operating conditions,viz. tbp concentration,ph of feed solution and stability of the membrane are investigated. under optimum conditions 63% of the initial vanillin concentration can be extracted. the main feature is that the elaborated fsslm system retained its stability and initial performance during the 5 days long experiment. the present study shows that,the developed slm system can be auspiciously applied to extract vanillin from aqueous solutions.