常压介质阻挡放电制备芳烃优先透过渗透汽化复合膜

Development of composite membranes via atmospheric dielectric barrier discharge(DBD) plasma for pervaporation separation of aromatic/aliphatic hydrocarbons

利用常压介质阻挡放电(DBD)等离子体技术,在非对称聚丙烯腈(PAN)超滤膜的表层微孔内接枝填充聚合聚乙二醇甲基丙烯酸酯(PEO360OHMA)大分子单体,制备具有芳烃优先透过性能的渗透汽化复合膜.采用衰减全反射傅里叶红外光谱(ATR-FTIR)、水接触角和扫描电子显微镜(SEM)表征复合膜的形貌和化学结构.以质量比为m(甲苯)∶m(正庚烷)=1∶4的甲苯/正庚烷混合物(80℃)为模型体系,考察了DBD处理时间、输入电压和接枝单体浓度对复合膜的接枝度和渗透汽化分离性能的影响.研究结果表明,常压介质阻挡放电等离子体技术制备的渗透汽化复合膜具有较好的芳烃/烷烃分离性能.

In order to prepare the pervaporation composite membrane with an excellent aromatic selective permeability,atmospheric dielectric barrier discharge（DBD） plasma system was used.Using this method,the macromonomer poly（ethylene glycol） methacrylate（PEO360OHMA） was graft polymerized in the pores of the separation layer of the asymmetric polyacrylonitrile（PAN） ultrafiltration（UF） membrane.Attenuated total reflection Fourier transform infrared spectroscopy（ATR-FTIR）,water contact angle measurements（WCA） and scanning electron microscopy（SEM） were used to characterize the morphology and chemical structure of the composite membrane.The influences of DBD treatment time,DBD input voltage,monomer concentration of grafting on the degree of grafting and pervaporation performance of composite membrane were systematically investigated by pervaporation experiments with toluene/n-heptane mixtures（m（toluene）∶m（n-heptane）=1∶4,80 ℃） as feed.The results showed that the composite membrane with excellent pervaporation selectivity and permeability was able to be fabricated by the atmospheric DBD plasma technique.