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A purification of ethanol solution was studied using adsorption in vapor phase. Rice straw and molecular sieves 3A were studied as adsorbents. It was investigated by evaporation of ethanol solution at 80oC and passing through a dynamic packed-column (0.9 cm dia. And 38 cm long). The column was controlled at 80, 85, and 90oC. It was found that rice straw as received was unable to increase the purity of ethanol compared to molecular sieves 3A in any cases. Moreover, column temperatures of 80 and 85oC showed suitably in term of ethanol purification.