基于Aspen Adsorption的乙醇变压吸附脱水工艺模拟

摘要

The dehydration process of crude ethanol vapor with 84.2%(x) C2H5OH through pressure swing adsorption was studied by means of the Aspen Adsorption software. The axial distribution of H2O adsorption quantity at different time was obtained,and the adsorption cycle was determined by solving the utilization level of the adsorption column. The influences of adsorption pressure and adsorbent volume on the adsorption process were investigated. It was showed that,the adsorption cycle of the ethanol dehydration with the pressure swing adsorption was related to the adsorption capacity of the adsorbent column at different time,which was 15 800 s;when the utilization rate of the adsorption column was 1,the adsorption column was saturated and the gas composition at the outlet was the same as the composition of the raw gas;Increasing operating pressure could enhance the adsorption capacity of the adsorption column,but the energy consumption also increased;when the absorbent volume increased, the simulating mass transfer coefficient should be decreased.%以84.2%（x）的乙醇蒸气为原料，基于Aspen Adsorption软件，研究了乙醇变压吸附脱水工艺，得到不同时刻吸附剂水吸附量轴向分布，并通过求解吸附塔利用率确定了乙醇变压吸附脱水工艺的操作周期，考察了吸附压力、吸附剂体积对乙醇变压吸附脱水工艺的影响。实验结果表明，乙醇变压吸附脱水的吸附周期与吸附塔在不同时刻水的吸附量有关，确定乙醇变压吸附脱水的操作周期为15800 s；吸附塔的利用率为1时，吸附塔吸附饱和，出口气组成和原料气组成相同；提高乙醇变压吸附脱水的操作压力可增加吸附塔的气体处理量，但同时增加了原料气预热的能耗；吸附剂体积增大时，扩散对传质系数的影响增大，需减少模拟所用传质系数。