In　this　paper,　the　binary　adsorption　isotherms　of　acetone-n-hexane,　toluene-n-hexane,　benzene-n-hexane　and　n-pentane-n-hexane　on　silylanization　silica　gel　are　presented.　The　adsorption　isotherms　for　pure　gas　are　also　obtained.　It　will　be　seen　from　the　experimental　results　that　the　adsorption　behavior　of　the　vapor　mixtures　can　be　predicted　from　the　isotherms　of　pure　components.　The　extent　of　predominant　adsorption　can　be　predicted　by　the　first　layer　adsorption　heat　of　the　individual　pure　components.