Separation of acetone and ethanol from aqueous solutions using membrane ... from aqueous solutions via membrane distillation, Bioprocess Engineering, 23, ...
Separation of acetone and ethanol from aqueous solutions using membrane distillation
Fawzi Banat, Fahmi Abu Al-Rub, Mohammad Al-Shannag The simultaneous removal of dilute acetone and ethanol from aqueous solutions by air gap membrane distillation is theoretically investigated [1]. A combined heat and mass transfer model that includes temperature and concentration polarization effects as well as temperature and concentration variation along the module length is employed to predict the flux and selectivity of acetone and ethanol under the relevant process operating conditions. Three mass transfer solutions are considered in the model, namely; the exact Stefan-Maxwell (S-M), the approximate StefanMaxwell and the Fickian binary solution. Such model was successfully used in our previous studies [2-9]. Although, qualitatively, the three solutions exhibit the same trends, quantitatively some differences exist between the Fickian-based solution on one hand and the Stefan-Maxwell solutions on the other hand. The exact and approximate solutions of the Stefan-Maxwell equation showed similar capability in predicting the process performance under all process conditions. Predictions showed that acetone selectivity and flux were strongly dependent on feed conditions and air gap width. References 1. Banat, F., Al-Rub, F., Shannag, M. (1999). Simultaneous removal of acetone and ethanol from aqueous solutions by membrane distillation: prediction using the Fick's and the exact and approximate Stefan-Maxwell relations, Heat and mass transfer, 35, 423-431. 2. AL-RUB, F.A., BANAT, F.A., SHANNAG, M. (1999). Theoretical assessment of dilute acetone removal from aqueous streams by membrane distillation, Separation Science and Technology, 34, 2817-2836. 3. Banat, F., Al-Shannag, M. (2000). Recovery of dilute acetone–butanol–ethanol (ABE) solvents from aqueous solutions via membrane distillation, Bioprocess Engineering, 23, 643-649. 4. Banat, F.A., Al-Rub, F.A., Jumah, R., Al-Shannag, M. (1999). Application of Stefan–Maxwell approach to azeotropic separation by membrane distillation, Chemical Engineering Journal, 73, 7175. 5. Banat, F.A., Al-Rub, F.A., Jumah, R., Shannag, M. (1999). Theoretical investigation of membrane distillation role in breaking the formic acid-water azeotropic point: comparison between Fickian and Stefan-Maxwell-based models, International communications in heat and mass transfer, 26, 879-888. 6. Banat, F.A., Al-Rub, F.A., Jumah, R., Shannag, M. (1999). On the effect of inert gases in breaking the formic acid–water azeotrope by gas-gap membrane distillation, Chemical Engineering Journal, 73, 37-42. 7. Banat, F.A., Al-Rub, F.A., Shannag, M. (1999). Modeling of dilute ethanol–water mixture separation by membrane distillation, Separation and Purification Technology, 16, 119-131. 8. BANAT, F.A., AL-RUB, F.A.A., JUMAH, R., AL-SHANNAG, M. (1999). Modeling of desalination using tubular direct contact membrane distillation modules, Separation Science and Technology, 34, 2191-2206. 9. Al-Shannag, M., Theoretical Investigation of Multicomponent Separation Problems by Membrane Distillation, Chemical Engineering Department, Jordan University of Science and Technology, Jordan, 1998.
