Reducing the Wettability of Porous Polymeric Membranes in Membrane Contactors: An Overview on the Methods and Their Effective Parameters

Document Type : Review

Authors

1 Department of Chemical Engineering, Behbahan Khatam Alanbia University of Technology, Postal Code 63616-63973, Behbahan, Iran

2 Department of Chemical Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran

Abstract

Gas-liquid membrane contactors are promising alternatives to conventional absorption technologies. However, despite their significant advantages, such systems face the major problem of gradual wetting of the porous polymeric membranes with liquid absorbents. In fact, wetting of porous polymeric membranes by liquid absorbents increases the mass transfer resistance of the membrane phase, which in turn, reduces the gas absorption efficiency. Accordingly, in this paper, the effect of membrane wetting on mass transfer resistance and absorption efficiency has been studied. The influence of effective parameters on membrane wetting phenomenon, such as absorbent and membrane properties, is investigated. In addition, different prevention methods of membrane wetting is discussed in detail. The results show the increase in the rate of wetting at high velocity and pressure of the absorbent. In the case of absorbents-containing organic compounds, their surface tension is decreased rapidly with the increasing concentration of organic compounds, which increased the wetting rate of the membrane. In addition, studies on various polymeric membranes have shown that the structural and chemical changes of the membrane surface, which occur due to long-term contact of the membranes with amine absorbents, strongly increase the wetting of the membranes, and thus, its functionality. Moreover, studies have shown that modifying the surface of membranes is one of the most effective methods to prevent the problem of wetting. By modifying the surface, the free energy of the membrane surface can be reduced and its roughness can be increased, thus increasing the hydrophobicity of the membrane surface. Among these, nanotechnology has been introduced as one of the most important technologies in the production of superhydrophobic membranes to prevent the problem of wetting the porous polymeric membranes. 

Keywords


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