高性能NaA沸石膜的制备及其脱盐性能

发布时间：2018-01-28 06:18

  本文关键词： 大孔α-Al_O_载体 Na A沸石膜 渗透蒸发 脱盐 微波加热　出处：《化工进展》2017年11期 　论文类型：期刊论文

【摘要】：以廉价大孔α-Al_2O_3管为载体,通过两步变温热浸渍涂晶法,修饰载体表面缺陷,得到连续而均匀的晶种层。在微波辅助作用下,短时间内有效诱导制备出超薄Na A分子筛膜。将其用于渗透汽化脱盐体系中,研究发现,微波加热法制备的超薄Na A沸石膜水通量明显高于常规加热法制备的较厚Na A沸石膜,水的渗透通量随着盐浓度的增大在小范围内有所降低,而操作温度的升高对水的渗透具有明显促进作用,当原料液浓度为0.6mol/L、操作温度85℃时,水通量达到11.03kg/(m2·h)。同时,离子截留率不受操作温度及原料液浓度的影响,始终保持99.9%。此外,Na A沸石膜在渗透蒸发脱盐中表现出较高的稳定性,75℃条件下,在0.6mol/L的Na Cl溶液中性能可稳定72h以上。该方法在降低制膜成本的同时有效提高了水的渗透通量及离子截留率,表明Na A沸石膜在膜法脱盐的工业化应用领域具有较好的应用前景。
[Abstract]:Using 伪 -Al _ 2O _ 3 as carrier, continuous and uniform seed layer was obtained by two-step thermo-impregnation method to modify the surface defects of the carrier. The ultrathin Na A molecular sieve membrane was effectively induced in a short time and was used in pervaporation desalination system. The water flux of ultrathin Na A zeolite membrane prepared by microwave heating is obviously higher than that of thicker Na A zeolite membrane prepared by conventional heating method, and the water permeation flux decreases in a small range with the increase of salt concentration. When the concentration of raw material solution was 0.6 mol / L and the operating temperature was 85 鈩，

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