Analysis of CO2 separation and simulation of a partially wetted hollow fiber membrane contactor

被引:84
作者
Keshavarz, R. [1 ]
Fathikalajahi, J. [1 ]
Ayatollahi, S. [1 ]
机构
[1] Shiraz Univ, Coll Engn, Petr & Chem Engn Dept, Shiraz, Iran
关键词
membrane contactor; hollow fiber; gas absorption; partial wet;
D O I
10.1016/j.jhazmat.2007.07.115
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A steady state model was developed for a microporous hollow fiber membrane contactor operated under partially wetted conditions accompanied by chemical reactions, to analyze CO2 absorption into the aqueous solution of diethanolamine (DEA). The proposed diffusion-reaction model contains reversible chemical reactions in the liquid bulk as well as wetted parts of the membrane pores. A numerical scheme was employed to solve the simultaneous nonlinear mathematical expressions, and the results were validated with experimental data in the literature. The gas phase concentration and velocity profile in axial direction inside the shell, liquid concentration profile in axial and radial directions inside the fibers, and also those within the wetted parts of the pores were predicted by using the model. The results of the model and proposed numerical scheme show that membrane wetting, even in very low fractions, can decrease the absorption flux significantly. The wetting fraction of membrane was predicted both with and without consideration of chemical reactions inside the wetted pores. The results indicate that the chemical reactions inside the wetted pores, which have been disregarded in the literature, have considerable effects on the prediction of membrane wetting fraction. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:1237 / 1247
页数:11
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