A Dynamic Gas-Water Imbibition Technique For Evaluation Of The Air Separation Ability Of Carbon Molecular Sieves

This thesis is composed of two parts, i.e. the investigation of gas-water imbibition characteristics of Carbon Molecular Sieves (CMS), and the evaluation of the air separation ability of CMS by the dynamic gas-water imbibition technique.In order to understand the theory of the dynamic co-current gas-water imbibition technique for evaluating the air separation ability of CMS, gas-water imbibition property of it has been investigated in this paper. A gas-water co-current flow pattern and a mathematic m6del based on Laplace equation and Poiseuille eqution are proposed for description the gas-water imbibition in intercommunicating pore and verified its suitability through studying on the dynamic gas-water imbibition characteristics of mesoporous carbon materials, gas-water imbibition property of CMS has been investigated. Experimental results show the gas-water co-current flow pattern and the mathematic model are suitable for description the dynamic gas-water imbibition characteristics of mesoporous carbon materials, there is a significant different in equilibrium gas volume expelled from CMS and equilibrium time of varied CMS, gas volume expelled from CMS is an linear function of time V = kt, the deviation from linearity is also observed, because at the beginning water penetrates all of "capillaries",then relatively fills quick somes and continues to penetrate remaining "capillaries"; the relative rate of gas-water imbibition increase with the increasing of temperature, the rate of gas-water imbibition increase with the decreasing of grain size.A dynamic gas-water imbibition technique for assessment of air separation ability of CMS is present. The air separation ability of samples is evaluated by comparing the difference in the relative rate of gas-water imbibition, the transition range between penetration and saturation stages and the distribution of filling time between samples and the commercial CMS. The approach was applied for assessment air separation ability of a large amount of samples to verify its feasibility. Experimental results show that the approach can be used to evaluate the air separation ability of CMS by gas-water imbibition indexes.