Preparation and performance of H-SOD membranes: a new synthesis procedure and absolute water separation
Successful and rapid synthesis of thin defect free hydroxy sodalite (H-SOD) membranes with a thickness of 2 m on -Al2O3 supports was achieved using direct hydrothermal synthesis. The membranes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and single gas permeation measurements. Single component pervaporation experiments were carried out to investigate water flux through H-SOD membranes at different temperatures and pressures. The membranes were used for pervaporative separation of water from water-isopropanol (IPA) mixtures. The effects of IPA feed concentration and temperature were studied on the permeation flux and the separation factor of water with respect to IPA. The membrane was impermeable to N2 and He permeance was as low as 10-11 mols-1m-2Pa-1, which validates absence of defects. Pervaporation fluxes of water up to 2.25 kgm-2h-1 at 423 K were obtained. In pervaporation of water from water/IPA mixtures, the membranes showed absolute selectivity towards water regardless of temperature or feed concentration. Increasing temperature seemed to have little effect on flux values; but increasing the water content in feed led to a dramatic increase in flux through the membrane.
S. Khajavi C. Jansen F. Kapteijn
Ceramic Membrane Centre “The Pore, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）