有机硅烷改性ZSM-5/BPPO非对称膜制备及其渗透汽化性能

Preparation of Silane Modified ZSM-5 Zeolite/BPPO Asymmetric Membrane and Its Pervaporation Performance

以硅烷改性ZSM-5分子筛为填充剂,采用沉浸凝胶相转化法制备了ZSM-5/BPPO非对称膜.结果表明,分子筛在BPPO膜中分散均匀,填充分子筛后膜表面粗糙度增大、疏水性增强.以低浓度乙醇-水体系为研究对象,考察了分子筛填充量、进料液浓度及进料液温度对ZSM-5/BPPO膜渗透汽化分离性能的影响.结果表明,随乙醇浓度增大,ZSM-5/BPPO膜的分离因子减小,渗透通量增大;随进料液温度升高,ZSM-5/BPPO膜的分离因子及渗透通量均增大;在60℃、分子筛填充量为0.3%(ω)时,ZSM-5/BPPO膜对5%(ω)乙醇-水体系的分离因子高达18.49,渗透通量为529.69g/(m2·h).ZSM-5/BPPO膜对不同醇-水体系的分离结果表明,醇类分子量越大,膜分离性能越好.

With silane modified ZSM-5 zeolite as filling agent,ZSM-5/BPPO [bromide poly（2,6-dimethyl-1,4-phenylene oxide）] asymmetric membrane was successfully prepared by phase inversion process.The SEM and AFM images showed that the zeolite was uniformly distributed within the membrane,and the ZSM-5/BPPO membrane had a higher surface roughness.The analysis of contact angel showed that the ZAM-5/BPPO membrane was more hydrophobic than the BPPO membrane.The effects of ZSM-5 content,feed solution concentration and temperature on the pervaporation performance of dilute ethanol-water solution were examined.The results showed that the separation performance of ZSM-5/BPPO membrane was excellent.With increasing of ethanol concentration in feed solution,the membrane selectivity decreased,while the permeation flux increased.With increasing of feed solution temperature,both the separation factor and the permeation flux increased.When the ZSM-5 content was 0.3%（ω）,feed concentration 5%（ω） and feed solution temperature 60℃,the total permeation flux and separation factor could reach 529.69 g/（m2·h） and 18.49,respectively.The pervaporation performance of ZSM-5/BPPO membrane on different alcohol-water mixtures showed that the higher the alcohol molecular weight,the better the separation performance.