模拟移动床吸附分离对二甲苯开工过程研究

考虑吸附剂床层内和床层之间空体积内液相的轴向扩散,基于实验得到的吸附平衡参数和传质系数,建立了模拟移动床吸附分离对二甲苯过程的模型,模拟结果与工业装置数据吻合较好。研究了预饱和组分、操作参数等对模拟移动床吸附分离对二甲苯开工过程的影响。结果显示:降低预饱和组分中乙苯、间二甲苯和邻二甲苯含量有利于缩短开工周期;对于工业装置预饱和吸附原料和解吸剂的开工过程,提高吸附进料量和提纯区循环流量有利于缩短开工周期。

RESEARCH ON THE STARTING UP PROCESS OF SIMULATED MOVING BED FOR PARA-XYLENE SEPARATION

The model of simulated moving bed(SMB) for xylene separation is established, considering the axial dispersion in the void volume，based on the adsorption equilibrium constants and mass transfer coefficients obtained from experiments. The simulation results and the industrial plant data are concordant. The effect of pre-saturated components, operation parameters on SMB process is investigated. Results show, reduction of ethylbenzene, meta-xylene and ortho-xylene in the pre-saturated components, increasing feed rate and purification zone flowrate are all benefit for shortening the start-up time of SMB process.