The Permeation of Iodine through a Diaphragm Type Liquid Membrane
The diffusion coefficient of iodine in poly (dimethylsiloxane)
1976 Volume 2 Issue 3 Pages 262-265
Details
1976 Volume 2 Issue 3 Pages 262-265
The rate of iodine permeation through a porous Teflon diaphragm, impregnated with poly (dimethylsiloxane) (PDS), was measured at 25.0°C. The obtained overall mass-transfer resistance was divided into two parts, namely the resistance of the liquid membrane and that of a boundary layer, by means of a Wilson plot. It was found important in the design of a diaphragm-type liquid membrane extractor to reduce the mass-transfer resistance of a boundary layer. The diffusion coefficient of iodine in PDS bulk was obtained by using cyclohexane as a standard material. The diffusion coefficient shows a very gradual decrease compared with the case for non-polymeric medium, when the molecular weight of medium material becomes large; in the end, it no longer decreases but remains constant.
