Thermal effects in osmotic distillation |
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| Institution: | 1. Department of Chemical Engineering, University of Engineering and Technology, Peshawar, 25120, Pakistan;2. PCSIR Laboratories Complex, Jamrud Road, Peshawar, 25120, Pakistan;3. National Center for International Research on Membrane Sci. & Technol, State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, PR China;4. School of Chemical & Materials Engineering (SCME), National University of Sciences & Technology (NUST), H-12 sector, Islamabad, Pakistan;5. Faculty of Chemical and Materials Engineering, Shahrood University of Technology, Shahrood, Iran;1. King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), Biological and Environmental Science & Engineering Division (BESE), Thuwal 23955-6900, Saudi Arabia;2. School of Civil and Environmental Engineering, Kookmin University, Jeongneung-Dong, Seongbuk-Gu, Seoul 136-702, Republic of Korea;3. Graduate School of Water Resources, Sungkyunkwan University, 2066 Seobu-ro, Jangan-Gu, Suwon, Gyeonggi-Do 16419, Republic of Korea |
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| Abstract: | Osmotic distillation (OD) is a concentration technique for aqueous mixtures based on porous hydrophobic membranes in contact on both sides with liquid phases at pressure lower than the pressure needed to displace the gas phase in the pores. The driving force for the water vapour diffusion through the gas phase immobilised within the membrane pores is sustained by an activity difference by using a hypertonic solution, typically concentrated brines, downstream the membrane. The mass transfer causes a cooling down of the feed and a warm up of the brine, as a consequence a temperature difference is created which reduces the effective driving force for mass transfer. This ‘thermal effect’ is investigated both theoretically and experimentally, it is shown that the effect on the flux is substantial. |
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