Abstract
Pervaporation of dilute benzyl alcohol solutions was studied using polydimethylsiloxane (PDMS) membranes. The membrane performance was investigated under various temperatures, downstream pressures and feed concentrations. The benzyl alcohol concentration in the permeate decreased dramatically by increasing the downstream pressure, but increased by increasing the operating temperature. The separation and recovery of benzaldehyde from nitrogen was also investigated. Polyetherimide flat sheet membranes were prepared and then coated with silicone material. The performance of membranes in both coupon form and spiral-wound configuration was studied. When the experimental results from both configurations were compared, it was found that for the same material the membrane coupons had higher separation efficiency than the spiral-wound prototype modules. The ratio of benzaldehyde mole fraction in the permeate to the feed reached 500 for a small membrane coupon of effective surface area 10.2 cm 2. This ratio was only 26 for the prototype modules, which can be attributed to some limitations of the membrane system design. These limitations are discussed and some recommendations to improve the performance are given.
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