Abstract
Hydrophobic membranes were characterized at elevated temperatures. Pressure was applied at the feed and permeate side to ensure liquid phase conditions. Within this scope, the applicability of different polymeric and ceramic membranes in terms of liquid entry pressure was studied using water. The Visual Method and the Pressure Step Method were applied for the experimental investigation. The results show the Pressure Step Method to be an early detection method. The tests at higher pressure and temperature conditions using the Pressure Step Method revealed the temperature as being the main factor affecting the liquid entry pressure. Novel LEP data up to 120 °C and 2.5 bar were obtained, which broadens the application range of hydrophobic membranes.
Highlights
Hydrophobic porous membranes for gas/liquid phase separation can be applied for gas-liquid membrane contactor, pervaporation, and membrane distillation [1]
Singh and Sirkar [8,9] verified experimentally the basic feasibility of successful operation at temperatures >80 ◦C and Luo and Lior [6] made a simulative study of the direct contact membrane distillation at T > 80 ◦C
The determination of Liquid Entry Pressure (LEP) using mathematical models is only possible for pre-defined membrane morphologies
Summary
Hydrophobic porous membranes for gas/liquid phase separation can be applied for gas-liquid membrane contactor, pervaporation, and membrane distillation [1]. There exists a huge application opportunity in the use of hydrophobic membranes for higher temperature applications, such as in membrane micro-reactors for high-temperature conditions [4] This is the case, for example, in the intensification of condensation reactions at temperatures higher than 80 ◦C that are limited by equilibrium [4]. Singh and Sirkar [8,9] verified experimentally the basic feasibility of successful operation at temperatures >80 ◦C and Luo and Lior [6] made a simulative study of the direct contact membrane distillation at T > 80 ◦C In both cases, it was concluded that increasing temperature caused an increase in the mass flux through the membrane
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