二组分气体在固体上吸附的研究(Ⅶ)─—在不同复盖度下二组分气体在氧化铝上的吸附规律

Studies on Binary Gas Solid Adsorption(Ⅶ) -Binary Gas Adsorption on Alumina with Different Surface Coverage

测定了不同复盖度下的苯－正己烷和正庚烷－正己烷两个二组分气体在氧化铝上的组成吸附等温度，以及单组分气体在氧化铝上吸附的ＢＥＴ常数．结果表明，随着复盖度的增加，两个体系的组成吸附等温线都向下靠近它们各自的气液平衡曲线，可以近似地将二组分气相与吸附相的平衡看成二组分的气液两相平衡。

The composition adsorption isotherms(y a～x g curve) for benzene-n-hexane and n-heptane-n-hexane vapor mixtures on alumina with different surface coverage(θ) at 25℃ are measured. The exp erimental results indicate that the y a～x g curves approach gradually down to their binary gas liquid equilibrium curve with the increasing surface coverage. Therefore, the binary gas phase and adsorption phase at equilibrium are similar to the binary gas liquid phase equilibrium. The composition adsorption isotherms of the two binary gases adsorption on alumina systems are in accord with simulated equation of relative volatility.