Abstract: NaA molecular sieve membranes are prepared on the outer surface of tubular α-Al2O3 carrier by the traditional in-situ hydrothermal method and the modified in-situ hydrothermal methods separately.The modified in-situ hydrothermal method is improved through aging the carrier tube and the synthetic solution together and renewing a synthetic solution during the crystallization process.The prepared membranes are characterized by XRD and SEM,and their pervaporation performances are evaluated and compared each other via a pervaporation device.The modified in-situ hydrothermal method is verified via experiments to have higher efficiency.NaA molecular sieve membrane prepared through modified method has larger amount of crystal and higher coverage,and its separation factor for C2H5OH/H2O on α-Al2O3 support is 20.2,which is much higher than that of membrane made by the traditional in-situ hydrothermal method.The prepared NaA membranes on α-Al2O3 carrier are used to carry out dehydration test of pyridine.Results show that a pyridine solution with a purity of 99.61 wt.% can be obtained when the concentration of feedstock pyridine solution is 95 wt.%,the feed temperature is at 96℃,and the treatment capacity is 1 720 mL·h-1·m-2.
景一操, 张怡, 吴煜, 刘学军. NaA分子筛膜的制备及其在吡啶脱水中的应用[J]. 现代化工, 2018, 38(6): 110-113.
JING Yi-cao, ZHANG Yi, WU Yu, LIU Xue-jun. Preparation of NaA molecular sieve membrane and its application for dehydration of pyridine. Modern Chemical Industry, 2018, 38(6): 110-113.
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