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

Xinjiang Petroleum Geology ›› 2002, Vol. 23 ›› Issue (3): 233-235.

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

WANG Zheng-de, ZHANG Mao-lin, MEI Hai-yan, SUN Liang-tian, LI Shi-lun, WU Qing-song

Received:2001-10-10 Online:2002-06-01 Published:2020-08-07
About author:WANG Zheng-de (1964-), Male, Doctor Candidate, Oil-Gas Field Development Engineering, Southwest Petroleum Institute, Nanchong, Sichuan 637001, China

Abstract

Abstract: 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 phenomenon, the adsorption-desorption circuit, and the capillary pressure effect on the phase equilibrium of the oil-gas system are well explained by using the Kelvin equation.

Key words: capillary condensation, adsorption, desorption, capillary pressure, metastable state, Kelvin equation

CLC Number:

TE311

WANG Zheng-de, ZHANG Mao-lin, MEI Hai-yan, SUN Liang-tian, LI Shi-lun, WU Qing-song. The Physical Chemistry Explanation of the Capillary Condensation and the Circuit of Adsorption-Desorption[J]. Xinjiang Petroleum Geology, 2002, 23(3): 233-235.

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

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