SORPTION DESORPTION AND DIFFUSION KINETICS OF KETONES AND NITRILES INTO FLUOROPOLYMER MEMBRANES/

Analysis of sorption/desorption and diffusion kinetics of ketones and nitriles at 25, 44, and 60 degrees C into three Du Pont's VITON fluoro polymer membranes loaded with different amounts of carbon black has be en undertaken by use of a sorption/desorption technique. The transport results are affected by the percent loading of carbon blacks. Diffusi on coefficients have been calculated from Pick's equation. These resul ts show a decrease with increasing amount of carbon black. Experimenta l results have been analysed by considering swelling of the membranes. Sorption/desorption results have been analysed from a calculation of the concentration profiles, which are obtained from the analytical sol ution of Fick's equation. These results have been compared with a nume rical solution based on the finite difference method. (C) 1997 John Wi ley & Sons, Inc.