摘要
研究了烷烃中少量芳烃的模拟移动床吸附动态过程,并在此基础上,用模拟移动床稳态和暂态吸附模型进行了拟合计算,传质采用线性推动力模型。结果表明:在文中的实验条件下,模拟移动床吸附分离过程可以达到将烷烃中的少量芳烃分离的目的。无论是稳态模型还是暂态模型的模拟计算结果都与实验值相符,且2个模型分别得到的轴向扩散系数和总传质系数相接近。在文中的实验条件下,总传质系数随切换时间的延长而减小。以上实验与计算结果为在直链烷基苯的生产过程中,降低循环烷烃中芳构化物的质量分数,实现延长脱氢催化剂的寿命提供了技术基础。
The experiment and modeling of simulated moving-bed adsorption used for separation of aromatics-paraffins mixture were studied.The dynamics model of steady-state mathematical model and transient mathematical model with linear driving force were tested with the experimental data.The calculated results show that both steady-state mathematical model and transient mathematical model can be used to express the dynamics adsorption characteristics for the system in experimental conditions.The axial dispersion coefficients and the overall mass transfer coefficients available from steady-state mathematical model are similar to those from transient mathematical model.The overall mass transfer coefficients in the zone I and zone II are greater than those in the zone III and zone IV.All these results form the basis towards the separation of aromatics from paraffins.
出处
《化学工程》
CAS
CSCD
北大核心
2004年第6期15-19,共5页
Chemical Engineering(China)
关键词
动态吸附
芳烃
模拟
模拟移动床
烷烃
adsorption
aromatics
modeling
simulated moving-bed
paraffins
