ZSM-11 membranes: Characterization and pervaporation performance
ZSM-11 membranes: Characterization and pervaporation performance
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DOI：
10.1002/aic.690480211
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发表时间：
2002-02
期刊：
影响因子：
3.7
通讯作者：
Shiguang Li;V. Tuan;R. Noble;J. Falconer
中科院分区：
文献类型：
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作者：
Shiguang Li;V. Tuan;R. Noble;J. Falconer
在多孔管状载体上制备了高质量的硼、铝取代ZSM-11分子筛膜，用于渗透汽化分离醇和水。B-ZSM-11膜对C1-C3醇具有较好的分离效果，在5 wt.%的B-ZSM-11膜上，最大通量为1.7 kg/m2·h甲醇/水混合物。随着碳原子数的增加，乙醇通量降低。甲醇/水的分离选择性随渗透汽化温度的升高而降低，其它醇/水的选择性随温度的升高而升高。所有的选择性随着醇进料浓度的降低而增加。在1至50 wt. %醇时，333 K下C1-C3直链醇的分离选择性高于汽液平衡选择性。对于甲醇/水、乙醇/水、1-丙醇/水和2-丙醇/水观察到的最高选择性分别为28、97、34和26，在lwt. %醇进料浓度。的分离选择性的基础上优先吸附的醇类和扩散速率的差异。
High-quality boron and aluminium-substituted ZSM-11 membranes were prepared on porous tubular supports to separate alcohols from water by pervaporation. The C1–C3 alcohols were preferentially separated from aqueous solutions through the B-ZSM-11 membrane, and the maximum flux was 1.7 kg/m2·h for a 5 wt.% methanol/water mixture. The alcohol fluxes decreased as the carbon number increased. The methanol/water separation selectivity decreased with pervaporation temperature, but other alcohol/water selectivities increased. All selectivities increased with decreasing alcohol feed concentration. In a range of 1 to 50 wt. % alcohol, the separation selectivities at 333 K for the C1–C3 linear alcohols were higher than vapor/liquid equilibrium selectivities. The highest selectivities observed for methanol/water, ethanol/water, 1-propanol/water, and 2-propanol/water were 28, 97, 34, and 26, respectively, at 1 wt. % alcohol feed concentrations. The separation selectivities were based on both preferential adsorption of alcohols and differences in diffusion rates.