Pervaporation Separation of Methanol-Carbontetrachloride Binary Mixtures Using Low Density Polyethylene Membranes

Abstract

In this study, the pervaporation behaviour of azeotrope-forming methanol-carbontetrachloride binary mixture at different compositions was investigated at 30°C and 45°C through LDPE membranes with two different melt flow indices for two different thicknesses. Experimental fluxes and selectivities for methanol and carbontetrachloride were determined. Theoretical calculations for fluxes based on a solution-diffusion model as developed by Yeom and Huang using Fujita's free volume approach and Flory-Huggins thermodynamics showed deviations from the experimental results. Experimental fluxes were decomposed into sorption and diffusion terms to discuss the effects of experimental conditions.

Separation of alcohol-ester binary mixtures by pervaporation

“…The sorption set-up and procedure is given in literature [6,7]. The reproducibility in sorption experiments was within ± 5%.…”

“…Pervaporation experiments were performed with a stirred semi-batch glass set-up [6,7]. Vacuum was maintained at ≤ 7 mbar within ±1 mbar by RZ 2 type Vacuubrand model vacuum pump.…”

“…Vapor permeate at the downstream side was collected alternatively in two liquid nitrogen traps. The detailed experimental procedure is given by Sentarli, et al [6] and Sain et al [7].…”

Separation of Butanol Using Pervaporation: A Review of Mass Transfer Models

“…The free volume theory has been reported to give a fairly good approximation of the diffusion coefficient and is applicable for membrane development in different pervaporation systems. It can be used to analize the diffusion through different types of membranes [108].…”