Pressure swing adsorption modeling of acetone and toluene on activated carbon
来源期刊：中南大学学报(英文版)2013年第10期
论文作者：TANG Lin(唐琳) LI Li-qing(李立清) XING Jun-dong(邢俊东) LIU Zheng(刘峥) YAO Xiao-long(姚小龙)
文章页码：2781 - 2790
Key words：pressure swing adsorption; heat transfer; mass transfer; Soret and Dufour effects; activated carbon
Abstract: A five steps pressure swing adsorption process was designed for acetone and toluene mixtures separation and recovery. Dynamic distributions of gas phase content and temperature were investigated. Based on the theory of Soret and Dufour, a non-isothermal mathematical model was developed to simulate the PSA process. Effects of heat and mass transfer coefficients were studied. The coupled Soret and Dufour effects were also evaluated. It is found that the heat transfer coefficient has little effect on mass transfer in adsorption stage. However, it has some impacts in desorption stage. The maximum value of C/C0 increases by about 25% as heat transfer coefficient decreases. The temperature variation is less than 0.05 K with the change of mass transfer coefficient, so that the effect of mass transfer coefficient on heat transfer can be ignored. It is also concluded that the Soret and Dufour coupled effects are not obvious in pressure swing adsorption compared with fixed-bed adsorption.
TANG Lin(唐琳), LI Li-qing(李立清), XING Jun-dong(邢俊东), LIU Zheng(刘峥), YAO Xiao-long(姚小龙)
(School of Energy Science and Engineering, Central South University, Changsha 410083, China)
Abstract:A five steps pressure swing adsorption process was designed for acetone and toluene mixtures separation and recovery. Dynamic distributions of gas phase content and temperature were investigated. Based on the theory of Soret and Dufour, a non-isothermal mathematical model was developed to simulate the PSA process. Effects of heat and mass transfer coefficients were studied. The coupled Soret and Dufour effects were also evaluated. It is found that the heat transfer coefficient has little effect on mass transfer in adsorption stage. However, it has some impacts in desorption stage. The maximum value of C/C0 increases by about 25% as heat transfer coefficient decreases. The temperature variation is less than 0.05 K with the change of mass transfer coefficient, so that the effect of mass transfer coefficient on heat transfer can be ignored. It is also concluded that the Soret and Dufour coupled effects are not obvious in pressure swing adsorption compared with fixed-bed adsorption.
Key words:pressure swing adsorption; heat transfer; mass transfer; Soret and Dufour effects; activated carbon
