MASS-TRANSFER OF ACETYLACETONE, ETHYLENE-GLYCOL MONO-NORMAL-BUTYL ETHER AND ETHYLENE-GLYCOL MONOPHENYL ETHER ACROSS WATER CARBON-TETRACHLORIDE AND WATER CHLOROFORM INTERFACES

The interfacial mass transfer kinetics of acetylacetone (acac), ethylene glycol mono-n-butyl ether (EGBE) and ethylene glycol monophenyl ether (EGPE) across water-carbon tetrachloride (Ccl4) and water-chloroform (CHCl3) interfaces were studied by stirring the two phases at various speeds, maintaining a quiescent interface with a constant area. In the analysis of data, two rate-determining steps consisting of a diffusion toward the interface and a mass exchange between the interface and bulk phases are considered. It is shown that the transfer of EGBE and EGPE in both CHCl3 and Ccl4 systems is controlled by the diffusion step even at high stirring speeds, whereas the transfer of acac in Ccl4 is controlled by the interfacial exchange step at high stirring speeds. An irreversible transfer has been also observed in the EGBE and EGPE systems at low stirring speeds. © 1990.