毛细凝聚和吸附-脱附回路的物理化学解释  

The Physical Chemistry Explanation of the Capillary Condensation and the Circuit of Adsorption-Desorption.

作　　者：汪政德[1] 张茂林[1] 梅海燕[1] 孙良田[1] 李士伦[1] 吴清松[2] 

机构地区：[1]西南石油学院,四川南充637001 [2]中国科学技术大学,安徽合肥230026

出　　处：《新疆石油地质》2002年第3期233-235,共3页Xinjiang Petroleum Geology

基　　金："油气藏地质及开发工程国家重点实验室"开放基金资助项目;编号PLN9902。

摘　　要：在测定多孔介质的吸附等温线时,常出现脱附滞后现象,即在同一压力下,吸附等温线与脱附等温线不相重合,脱附曲线高于吸附曲线,形成所谓“吸附-脱附回路”。从物理化学中亚稳状态的基本理论出发,得到平面液体的饱和蒸气压与微小液滴的饱和蒸气压之间的关系———开尔文(Kelvin)方程,利用该方程解释了毛细凝聚现象,论证了产生吸附-脱附回路现象的原因,分析了在多孔介质中毛细管压力对油气体系相平衡的影响。The desorption lag phenomenon is often appeared when measuring the adsorption isotherm of the porous media,that is the desorption isotherm is higher than the adsorption isotherm at the same pressure,shaping the circuit of adsorption and desorption.The Kelvin equation to be used for describing the relationship between a small drop and a plane of liquid is derived from the basic metastabel state theory of physical chemistry.The capillary condensation phe-nomenon,the adsorption-desorption circuit,and the capillary pressure effect on the phase equilibrium of the oil-gas sys-tem are well explained by using the Kelvin equation.

关 键 词：物理化学 凝聚 吸附 脱附 毛细管压力 亚稳状态 开尔文方程 多孔介质 凝析油气体系 

分 类 号：TE311[石油与天然气工程—油气田开发工程]