The effectiveness of perstraction separation of a 2 vol % 2-propanol-n-heptane mixture using dodecane as the strip liquid was studied using a hollow fiber contained liquid membrane permeator (HFCLMP). The liquid membranes used were pure water and 3 wt % water in sulfolane. Both liquid membranes yielded similar mass-transfer coefficients and 2-propanol removal rates. Pure water, however, exhibited 3 times higher selectivity for 2-propanol than 3 wt % water in sulfolane. Selectivities of 2-propanol over n-heptane as high as 447 were experimentally obtained. The observed fluxes and selectivities at 25 °C are close to those obtained in prevaporation of a 10% 2-propanol-n-hexane mixture through cellulose ester films at 60 °C. A first-order mathematical model was developed using partition coefficients that are functions of solute concentration, and it predicts the observed behavior of the two systems relatively well.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering