PHENOL RECOVERY WITH SLM USING CYANEX-923

The study of the phenol separation-concentration process with the holl ow fiber supported liquid membrane technology has been performed. Mixt ures of kerosene and CYANEX 923 were used as liquid membrane. The extr actant CYANEX 923 is characterized by a high phenol selectivity and an extremely low solubility in the aqueous phase. The introduction of CY ANEX 923 in the membrane composition decreases the extractant losses f rom the pores of the support. The phenol separation and simultaneous c oncentration process has been checked. The influences of the initial c oncentration of phenol in the feed solution and sodium hydroxide in th e stripping phase and the membrane composition on the separation rate have been investigated in a single-pass mode. The analysis of the memb rane composition influence has been performed according to the steady- state mass transfer conservation equation and the associated boundary conditions, leading to the mass transfer parameters of the process.