矩形波応答法を用いた吸着性気体の多孔質ガラス内表面拡散現象の解析

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  • Analysis of surface diffusion phenomena of adsorptive gases through porous glass by square pulse response method.
  • クケイハ オウトウホウ オ モチイタ キュウチャクセイ キタイ ノ タコウシツ

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A new experimental method was proposed to analyze the surface diffusion phenomena of adsorptive gases through porous glass in a dilute region, where the effect of the interaction between adsorbed molecules and surface appeared clearly. The proposed experimental method consisted of a quasi-steady permeation experiment and a square pulse response experiment. By a square pulse response analysis it was derived theoretically that the retention time was a function of the inlet pulse width in the dimensionless time region. Based on these considerations, a simple analytical scheme to determine effective diffusion coefficient, Henry constant and surface diffusion coefficient was established.<BR>To check the validity of the proposed method, experiments were carried out at 298K and 318K in the pressure range where Henry's law could be assumed. Gases used were as follows : carbon dioxide, nitrous oxide, ethane, ethylene, propane, propylene, 1-butene, R-12, R-22 and R-114. The results obtained from square pulse response experiments agreed well with the theoretical calculations for the whole range. The parameters obtained were dependent on temperature similarly to those reported in past papers, and the values were reasonable. These results supported the validity of the proposed experimental method.

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