吸附热预测吸附等温线

实验测定了N2 在沸石分子筛、C2 H6 在活性炭、CO2 在硅胶上的吸附等温线 ,研究用Clausius Clapeyron方程求得等量吸附热、再利用所得的吸附热预测其它温度的吸附等温线数据的方法。将吸附热预测的等温线与实验值及插值法内插得到的吸附等温线数据进行了比较 ,结果表明吸附热预测值与实验值吻合较好。此外还对文献数据利用等量吸附热预测较高压力 ( 65 0kPa)下的等温线 ,均与文献中的实验值一致。为吸附工业操作需要不同温度下的等温线数据和吸附过程的模拟与设计提供了简便、准确的计算方法

Prediction of adsorption isotherms with isosteric heat of adsorption

In order to exploit and design adsorption separation processes of gases, quantitative characterization of adsorption isotherms as functions of pressure and temperature are needed, but in many cases there are in short of experimental adsorption data at the required temperatures.A method for prediction of adsorption isotherm based on isosteric heat from Clausius Clapeyron equation was suggested. From the experimental adsorption isotherm data at two temperatures, the isosteric heat of adsorption was obtained, and that then could be used for the adsorption isotherm calculation at other temperature. With the experimental adsorption data of nitrogen on a zeolite molecular sieve, ethane on an activated carbon, carbon dioxide on a silica gel and the data from the literature, the method was tested for the adsorption isotherm predictions at the temperatures both within and out the two experimental temperature range, and the predictions was compared with the experimental data and the results obtained by the interpolation. It was shown that the predictions from the isosteric heat of adsorption were in good agreement with the experimental data, and were much superior to the interpolation results.