为了更好地指导马铃薯粉等淀粉质原料用于乙醇脱水，需要确定马铃薯粉对乙醇-水体系的吸附特性并建立其吸附等温线模型。根据吸附原理，利用吸附-脱附法对乙醇-水体系中水在马铃薯粉上的平衡吸附量和吸附等温线进行了测定和模型拟合。研究结果表明：乙醇-水体系中水在马铃薯粉中的吸附等温线为S型，属于Brunauer's分类中的Ⅱ型吸附等温线，随着温度升高，吸附量下降，GAB模型能更好地描述乙醇-水体系中水在马铃薯粉中的吸附平衡。

In order to be better guide potato powder used for ethanol dehydration, water adsorption isotherms on potato powder should be determined, and a sorption isotherm model should be developed. Adsorption equilibrium models have been used to fit the experimental data for water adsorption isotherms on potato powder. Results from the adsorption equilibrium experiments indicated that, isotherm of potato powder exhibited Type Ⅱ (according to the Brunauer’s classification). The sorption capacity decreased with increasing temperature. GAB model was found to be the best represent experimental data.