Numerical simulation of CO2 separation from gas mixtures in membrane modules: Effect of chemical absorbent

Abstract

In this study, a mathematical model is proposed for prediction of CO 2 absorption from N 2 /CO 2 mixture by potassium threonate in a hollow-fiber membrane contactor (HFMC). CFD technique using numerical method of finite element was applied to solve the governing equations of model. Effect of different factors on CO 2 absorption was analyzed and for investigation of absorbent type effect, functioning of potassium threonate was compared with diethanolamine (DEA). Axial and radial diffusion can be described with the two dimensional model established in this work. The obtained simulation results were compared with the reported experimental data to ensure accuracy of the model predictions. Comparison of model results with experimental data revealed that the developed model can well predict CO 2 capture by potassium threonate in HFMCs. Increment of absorbent flow rate and concentration eventuate in enhancement of CO 2 absorption. On the other hand, capture of CO 2 will be reduced with increment of gas flow rate. According to the model results, potassium threonate can be considered as a more efficient absorbent as compared with DEA. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Hydrogen recovery from ammonia purge gas by a membrane separator: A simulation study

“…54,55 However, Navier-Stokes equation is more usual and frequently used for calculation of the fluid velocity in the shell for all membrane geometries. The velocity of fluid in the shell side of HFM separator can be determined by Happels free surface model.…”

SO2 Removal from Gas Streams by Ammonia Scrubbing: Process Optimization by Response Surface Methodology

“…3 shows the analysis-of-variance (ANOVA) results for 31 full CCD of the desulfurization efficiency. A polynomial quadratic model for desulfurization in terms of actual parameters, or a so-called modified second-order response surface model, was obtained as follows: þ1:431 10 À6 C SO 2 2 þ 3:839Q 2 þ 0:026T 2 þ 85:531C NH 3 2 À0:002QC SO 2 þ 8:92 10 À5 TC SO 2 À 0:003C SO 2 C NH 3 À 0:374QT À52:972QC NH 3 À 3:37TC NH 3 þ 1:537TQC NH 3 (11) where C SO 2 is the input sulfur dioxide (SO 2 ) concentration, T is the reaction temperature, C NH 3 is the concentration of the ammonia solution, and Q is the flow rate of the polluted air.…”

“…Nowadays, emission of greenhouse gases is being a major concern worldwide due to their adverse effects on the environment and human life [1][2][3][4][5][6]. Elimination and capture of pollutants emitted into the environment is an essential requirement for human life and for sustainable development as well [7][8][9][10][11][12]. It has been reported that greenhouse gases are produced mainly from burning fossil fuels such as natural gas, petrol, diesel, and crude oil, in which CO 2 an SO 2 are the major greenhouse gases [13,14].…”

Computational Simulation of Mass Transfer in Molecular Separation Using Microporous Polymeric Membranes

“…Membrane contactors (MCs) have been used for liquid/liquid as well as gas/liquid separation by Rezakazemi et al [36][37][38][39][40] in which the main focus was on model development and simulation of the process. It was reported that hollow-fiber contactors are more effective than other modules owing to their operational properties [41][42][43]. Shirazian et al [44][45][46][47][48][49] studied the use of hollow fibers for CO 2 capture and other gas mixtures by numerical simulation of the contactor system.…”