Pervaporation separation of ethanol-water mixtures through B-ZSM-11 zeolite membranes on macroporous supports
Pervaporation separation of ethanol-water mixtures through B-ZSM-11 zeolite membranes on macroporous supports
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通过大孔载体上的 B-ZSM-11 沸石膜渗透汽化分离乙醇-水混合物
DOI：
10.1016/j.memsci.2015.01.054
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发表时间：
2015-10-01
影响因子：
9.5
通讯作者：
Zhang, Yan
中科院分区：
文献类型：
--
作者：
Chai, Lijun;Li, Huazheng;Zhang, Yan
以廉价的大孔α-Al_2O_3为载体，制备了硼取代硅沸石（B-ZSM-11）膜，用于渗透汽化分离乙醇和水。XRD和FTIR证实了硼原子进入MEL骨架。考察了合成液中B/Si比、PV操作温度和料液浓度对膜分离性能的影响。当B/Si比为0.06时，B-ZSM-11膜在60 ℃下对5wt%乙醇/水混合物的总通量为1.51 kg·m（-2）·h（-1），分离因子为35.0。总通量随着PV温度从30 ° C增加到75 ° C而增加，并且分离因子在60 ° C时显示出最高值。分离因子随着进料浓度从1至7重量%而降低，并且对于5重量%的混合物，总通量也显示出最高值。结果表明，在MEL结构中引入硼原子后，B-ZSM-11膜对乙醇/水溶液的分离性能得到改善。另一方面，更好的疏水性的B-ZSM-11膜，证明了接触角测量，是负责渗透汽化性能的乙醇/水的混合物。(C)2015 Elsevier B. V.版权所有。
Boron-substituted silicalite-2 (B-ZSM-11) membranes were prepared on seeded cheap macroporous alpha-Al2O3 tubes to separate ethanol from water by pervaporation. The incorporation of boron atom into MEL framework was confirmed by XRD and FTIR. The effects of B/Si ratio in the synthesis solution together with PV operation temperature and feed concentration on separation properties of the membranes were investigated. The B-ZSM-11 membrane prepared with B/Si ratio of 0.06 exhibited the highest separation factor of 35.0 with a total flux of 1.51 kg m(-2) h(-1) for 5 wt% ethanol/water mixtures at 60 degrees C. The total flux increased with increasing PV temperature from 30 to 75 degrees C and the separation factor showed the highest value at 60 degrees C. The separation factor decreased with feed concentration from 1 to 7 wt% and the total flux also showed the highest value for a 5 wt% mixture. It is demonstrated that the incorporation of boron atom into MEL structure improved separation performance of B-ZSM-11 membrane for ethanol/water solutions. On the other hand, the better hydrophobicity of B-ZSM-11 membranes, evidenced by contact angle measurements, is responsible for pervaporation performance for ethanol/water mixtures. (C) 2015 Elsevier B.V. All rights reserved.