Preparation and Pervaporation Performance of High Flux Silica Composite Membranes

Abstract

Abstract: The acid resistance and stability exhibited by silicon composite membranes hold great promise for applications in the field of pervaporation. The support layer of the silica composite membranes were prepared by a vacuum suction dipping method to obtain a high flux silica composite membrane. In this paper, the optimal conditions for vacuum suction of the support layer were explored, and the surface and cross-sectional topography of the membranes were characterized by scanning electron microscope. The results show that when the mass concentration of the supporting layer sol is 2%, the vacuum suction time is 10 s, and the vacuum suction pressure is 0.10 MPa, dense silica composite membranes are prepared with the membrane thickness around 6 μm to 7 μm. The silica composite membranes prepared in this paper are applied to the pervaporation of isopropanol aqueous solution and show excellent separation performance, and the permeation flux of isopropanol is 6.42 kg/(m²·h).

Key words: silica, composite membrane, vacuum suction dipping method, pervaporation, separation performance

CLC Number:

TQ028.8

LIU Xiaoyu, WU Hongdan, ZHOU Zhihui, LI Shengli, DENG Sihao. Preparation and Pervaporation Performance of High Flux Silica Composite Membranes[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2388-2395.

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