PEA-NaA /α-Al2OPEA-NaA /α-Al2O3复合支撑分子筛膜的微波水热合成

Microwave Synthesis of Polyetherimide-NaA /α-Al2O3 supported Zeolite Membrane

摘要:

采用微波水热合成法在聚醚酰亚胺(PEA)-NaA分子筛/α-Al2O3复合载体表面合成了具有高选择性的致密NaA 型分子筛膜，重点考察了微波辐射时间对成膜的影响。采用X射线衍射图谱（XRD）和扫描电子显微镜（SEM）对NaA型分子筛膜进行了表征。XRD 结果表明，复合载体表面生成的膜中只有NaA 分子筛的晶相；SEM 结果表明，复合载体基膜表面覆盖了一层致密连续的NaA型分子筛膜。合成NaA型分子筛膜的渗透汽化性能和不同乙醇水溶液浓度对渗透汽化性能的影响的结果表明，渗透通量随乙醇溶液的浓度增大而减小，分离因子则反之，当乙醇溶液浓度为95%时，渗透通量仅0.05 kg/ (m2?h)，而分离因子高达13000。

Abstract:

High-performance NaA zeolite membrane was synthesized on polyetherimide(PEA)-NaA zeolite/α-Al2O3 composite supports by microwave heating method. Influence of microwave heating time on membrane synthesis was mainly investigated. The as-synthesized NaA zeolite membranes were characterized by XRD and SEM. XRD results show that only NaA zeolite emerges on the composite support surface. The SEM results show the composite support surface is fully covered by uniform and compact NaA zeolite membrane. The pervaporation properties of the as-synthesized membrane were evaluated by dehydration of alcohol/water mixture. It was found that the flux decreased with the increment of the alcohol amount in the feed, separation factors were on the contrary. Pervaporation results present that separation factors were as high as 13000 at m(C2H6O) /m (H2O) = 95:5, instead, the fluxes were only 0.05 kg/(m2?h).