气态膜过程中的热效应  

The thermal efficiency in the gas membrane process

作　　者：沈志松[1] 钱国芬[1] 王猛[1] 陈洁[2] 王乃祥 

机构地区：[1]江苏省微生物研究所环境工程室 [2]南京理工大学环境科学与工程系

出　　处：《膜科学与技术》1998年第4期46-49,共4页Membrane Science and Technology

摘　　要：实验表明提高温度（Ｔ）能大幅度增加挥发性物质在气态膜过程中的传质系数（Ｋ），Ｋ和Ｔ间的关系符合Ａｒｈｅｎｉｕｓ方程Ｋ＝Ｋｏｅｘｐ（－Ｅ／ＲＴ）．用Ｓｔｏｋｅｓ－Ｅｉｎｔｅｉｎｓ和Ｌｅｖｅｑｅ方程，从理论上证实：（１）对于易挥发性物质（如ＨＣＮ），温度主要是通过降低进水边界层中水溶液的粘度或提高扩散系数，而使传质系数大幅度升高；（２）对于挥发性较小的物质（如苯酚），温度主要是通过提高其蒸汽压或进水边界层和膜微孔中气相间的分配系数（Ｈ）而使传质系数大幅度的提高．Experimental results in this study revealed that the mass transfer coefficient( K )of volatile substances could be greatly increased with the temperature( T )rising in the gas membrane process.The relationship between K and T could be treated by an empirical equation which has the form of Arrhenius equation: K=K 0exp(- E/RT ).By using both Stockes-Einteins equation and Leveqe equation,it is proven theoretically that the influence or temperature on the mass transfer coefficient is by means of two aspects.The first one is the decrease of viscosity or the increase of the diffusion coefficient in the boundary layer of feed solution for high volatile substances (such as HCN). The second one is the increase of partial vapor pressure of the partition coefficient ( H ) between the feed boundary layer and membrane pores for low volatile substances (such as phenol).

关 键 词：气态膜 传质 中空纤维 膜分离 膜材料 

分 类 号：TQ051.893[化学工程] TQ028.8