標題: A numerical modelling study of SO2 adsorption on activated carbons with new rate equations
作者: Li, Ziyi
Liu, Yingshu
Wang, Haihong
Tsai, Chuen-Jinn
Yang, Xiong
Xing, Yi
Zhang, Chuanzhao
Xiao, Penny
Webley, Paul A.
環境工程研究所
Institute of Environmental Engineering
關鍵字: Adsorption;Sulfur dioxide;Activated carbons;Breakthrough curve modelling;Intraparticle diffusion
公開日期: 1-Dec-2018
摘要: Modelling dynamic adsorption of sulfur dioxide (SO2) on activated carbons (ACs) is significant in guiding practical desulphurization processes and making highly efficient use of adsorbents in terms of the adsorption rate which largely depends on particle size. In this work, models derived from the Vermeulen and an improved linear driving force (LDF) rate equation were studied for the first time on SO2 adsorption over AC particles with different sizes. For larger particles (>= 3 mm), breakthrough curves predicted by the Vermeulen equation showed good agreement with experimental data, demonstrating that intraparticle diffusion resistance varied with particle size, feed concentration, adsorption time and location. For smaller particles (1 mm), a correction on the volume-averaged adsorption capacity as a function of adsorption time and saturation in the rate equation was developed to avoid the underestimation of adsorption rate due to the inappropriate parabolic concentration profile inherent in the conventional LDF model. By providing a concentration gradient and adsorption rate closer to actual values, the improved LDF equation was confirmed to provide excellent prediction results on 1-mm particles. Different modelling characteristics of the two models indicates varying effects of intraparticle diffusion on adsorption rate with particle size regarding the specificity of SO2 physisorption on ACs.
URI: http://dx.doi.org/10.1016/j.cej.2018.07.119
http://hdl.handle.net/11536/148005
ISSN: 1385-8947
DOI: 10.1016/j.cej.2018.07.119
期刊: CHEMICAL ENGINEERING JOURNAL
Volume: 353
起始頁: 858
結束頁: 866
Appears in Collections:Articles