Influence of acid on the permeation properties of NaA-type zeolite membranes
Influence of acid on the permeation properties of NaA-type zeolite membranes
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DOI：
10.1016/j.memsci.2009.11.052
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发表时间：
2010-03-01
影响因子：
9.5
通讯作者：
Mizukami, F.
中科院分区：
文献类型：
--
作者：
Hasegawa, Y.;Nagase, T.;Mizukami, F.
研究了naa型沸石膜的酸稳定性。为了快速评价膜的稳定性，利用质谱仪实时监测了渗透汽化过程中膜的渗透通量变化。当料液中加入硫酸时，加酸后水的渗透通量立即急剧下降（步骤(I)），然后略有下降（步骤（II）），最后显著增加（步骤（III））。在步骤（III）中，乙醇的渗透通量也显著增加。结果表明，naa型沸石膜在加入1.0 mL硫酸后，对313 K等摩尔水和乙醇混合物在10 min内失去了分离能力。水解反应和溶解发生在步骤(I)-(III)。此外，还讨论了进料液中酸添加量和乙醇含量对沸石膜破坏的影响。(C) 2009 Elsevier B.V.版权所有
The acid stability of the NaA-type zeolite membrane was evaluated in this study. For the rapid evaluation of membrane stability, the change in the permeation fluxes of the membrane was monitored in real-time by using a mass spectrometer during pervaporation. When sulfuric acid was added to the feed solution, the permeation flux of water decreased dramatically immediately after the acid addition (step (I)), then decreased slightly (step (II)), and finally increased significantly (step (III)). The permeation flux of ethanol also increased significantly in step (III). As a result, the NaA-type zeolite membrane lost its separation ability for an equimolar mixture of water and ethanol at 313 K in 10 min after the addition of 1.0 mL sulfuric acid. Hydrolysis reaction and dissolution occurred in steps (I)-(III). Furthermore, we also discuss the influence of the amount of added acid and ethanol content of the feed solution on the destruction of the zeolite membrane. (C) 2009 Elsevier B.V. All rights reserved.