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*10-6mol/(s?m2?Pa)，选择性可达145。

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 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?m2?Pa) and 145, respectively.

[1] Huang W Q, Bai J, Zhao S H, et al. Investig ation of oil vapor emission and its evaluation methods [J]. J Loss Prevent Proc. 2011, 24: 178-186.
[2] Klimont Z, Cofala J, Schopp W, et al. Projections of SO2, NOx, NH3 and VOC emissions in East Asia up to 2030 [J]. Water Air Soil Pollut. 2001, 130: 193-198
[3] Fenger J. Urban air quality [J]. Atmos Environ. 1999, 33: 4877-4900
[4] Atkinson R. Atmospheric chemistry of VOCs and NOx [J], Atmos Environ. 2000, 34(12): 2063-2101.
[5] 郝吉明, 马广大. 大气污染控制工程[M]（第二版）.北京: 高等教育出版社, 2002
[6] Urashima K, Chang J S. Removal of Volatile organic compunds from air streams and industrial fuel gases by non-thermal plasma technology [J]. IEEE Trans Ind Appl.2000, 7(5): 602-614.
[7] Dinelli G, Civitano L,Rea M, et al. Industrial experiments on pluse corona simultaneous removal of NO and SO2 from fluegas [C]. IEEE IAS Annual Meeting, 1998, 1620-1627.
[8] 吴碧君, 刘晓勤. 挥发性有机物污染控制技术研究进展. 电力环境保护. 2005, 21(4): 39-42
[9] Gales L, Mendes A, Cosat C. Removal of acetone, ethyl acetate and ethanol vapors from air using a hollow fiber PDMS membrane module [J]. J Membr Sci. 2002, 197 (1): 211-222
[10] Liu G P, Wei W, Wu H, et al. Pervaporation performance of PDMS/ceramic composite membrane in acetone butanol ethanol (ABE) fermentation-PV coupled process, J Membr Sci. 2011, 373: 121-129
[11] Strathmann H. Membrane separation processes: current relevanceand future opportunities [J]. AIChE J. 2001, 47 (5): 1077-1087.
[12] Prabhakar R, Freeman B. Application of hydrocarbon-flurocarbon interactions in membrane based gas separations [J]. Desaline, 2002, 144: 79-83.
[13] Liu L, Chakma A, Feng X S. Separation of VOCs from N2 using poly(ether block amide) membrane [J]. Can J Chem Eng. 2004, 39: 149–164.
[14] Majumdar S, Bhaumik D, Sirkar K K. Performance of commercial-size plasma polymerized removing VOCs from N2/air [J]. J Membr Sci. 2003, 214: 323-330.
[15] Park H B, Lee Y M. Separation of toluene/nitrogen through segmented polyurethane and polyurethane urea membranes with different soft segments. J Membr Sci. 2002, 197: 283–296.
[16] Xiangli F J, Chen Y W, Jin W Q, et al. Polydimethylsiloxane(PDMS)/ceramic composite membrane with high flux for pervaporation of ethanol-water mixtures. Ind Eng Chem Res. 2007, 46: 2224-2230.
[17] Liu S, Teoa W K, Tan X Y, et al. Preparation of PDMSvi-Al2O3 composite hollow fibre membranes for VOC recovery from waste gas streams. Sep Purif Technol. 2005, 46: 110–117
[18] Liu G P, Hou D, Wei W, et al. Pervaporation separation of butanol-water mixtures using polydimethylsiloxane/ceramic composite membrane [J]. Chinese J Chem Eng, 2011, 19(1): 40-44.
[19] Yeom C K, Lee S H, Song H Y, et al. Vapor permeations of a series of VOCs/N2 mixtures through PDMS membrane [J]. J Membr Sci. 2002, 198(1): 129-143.
[20] Barton A F M. CRC handbook of solubility parameters and other cohesion parameters, CRC press. Boca Raton, FL, 1985.
[21] Mohtada S, Mohammad A, Kazem S, et al.Gas permeation through a synthesized composite PDMS/PES membrane [J]. J Membr Sci. 2009, 342: 236-250.
[22] Lide D R. CRC Hand Book of Chemistry and Physics, CRC press. Cleveland, OH, 2002-2003.