中文摘要：

采用涂布法制备了聚二甲基硅氧烷/聚偏氟乙烯（PDMS/PVDF）复合膜,并用于VOC/N2体系（正己烷/N2、环己烷/N2、正庚烷/N2二元混合气体）的分离,系统地考察了原料气浓度、原料气流速、操作温度对PDMS/PVDF复合膜分离性能的影响.结果表明,随着原料气浓度的升高、流速的增大,VOC的渗透率及选择性均增大,而随着操作温度的升高,VOC的渗透率和选择性有所降低.连续运行三个月,膜分离性能稳定,正庚烷的渗透率为1.2×10^-6 mol/（s·m2·Pa）,选择性可达145.

英文摘要：

Poly（dimethylsiloxane） （PDMS）/poly （vinylidenefluoride） （PVDF） composite membrane was prepared for the separation of n-hexane/nitrogen, cyclohexane/nitrogen and n-heptane/nitrogen mixtures. The effects of feed concentration, flow rate and operating temperature on the performance of the PDMS/PVDF composite membrane were systematically studied. It was found that VOC permeance and separation factor increased with increasing feed VOC concentration and feed flow rate, while decreased with the increase of operating temperature. The PDMS/PVDF composite membranes exhibited good and stable performance during three months continuous operation, with n-heptane permeance and separation factor of 1.2× 10^-6mol/（s · m^2 · Pa） and 145, respectively.