Preparation of Polymeric Membrane for pervaporation separation

Poly (ether-block-amide) membranes were made via casting a solution on a non solvent surface. In this research, effects of different parameters such as ratio of solvent mixture (n-butanol / iso propanol), temperature and polymer concentration, on quality of the thin film membranes were studied. The results showed that the film quality enhances with increasing iso propanol ratio in the solvent mixture. This behavior can be related to reduction of solution surface tension and interfacial tension between solution and non solvent. Uniform films were made at a temperature rang of 70-80 0C and a polymer concentration of 4-7 wt%. Morphology of the membrane was investigated with Scanning Electronic Micrograph (SEM). Pervaporation of ethyl butyrate / water and iso propanol / water mixtures was studied using these membranes and high separation performance was achieved. For ethyl butyrate / water mixtures, It was observed that both permeation flux and separation factor increase with increasing ethyl butyrate content in the feed. However, for iso propanol / water mixtures, it was found that by increasing iso propanol content in the feed, permeation flux enhances but separation factor diminishes. Increasing temperature in limited range studied resulted in decreasing separation factor and increasing permeation flux.

کلیدواژه ها:

Poly (ether block amide) membranes ، Polymeric solution ، Non solvent ، Surface tension ، PV