Modeling of CO2 Capture by Amine Solution (MDEA) in Hollow Fiber Membranes

2014 ◽  
Vol 625 ◽  
pp. 537-540
Author(s):  
Sina Gilassi ◽  
Zakaria Man ◽  
Adulhalim Shah Maulud ◽  
Alamin Idris
Keyword(s):  
Hollow Fiber ◽  
Liquid Flow Rate ◽  
Hollow Fiber Membrane ◽  
Operating Conditions ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Amine Solution ◽  
Shell And Tube ◽  
And Diffusion ◽  
Good Agreement

The absorption of carbon dioxide is investigated in a hollow fiber membrane contactor, a two dimensional model is suggested to predict the CO2removal efficiency. The continuity equation consisting of convection and diffusion terms is applied in both shell and tube sides, and only diffusion is considered in axial and radical directions through the membrane. All equations are solved numerically by COMSOL software and the numerical method is on the basis of Finite Element Method (FEM). Amine solution is chosen as an absorbent to remove CO2in different operating conditions such as gas and liquid flow rate. The result of this modeling was compared with experimental data taken from literature and good agreement was observed. The simulation results revealed that methyldiethanolamine (MDEA) was an efficient absorbent. The suggested model is recommended to predict CO2concentration in a hollow fiber membrane contactor.

scholarly journals Numerical Simulation on Supercritical CO2 Fluid Dynamics in a Hollow Fiber Membrane Contactor

Computation ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 8 ◽  
Author(s):  
Hugo Valdés ◽  
Kevin Unda ◽  
Aldo Saavedra
Keyword(s):  
Hollow Fiber ◽  
Supercritical Co2 ◽  
Fiber Length ◽  
Hollow Fiber Membrane ◽  
Fluid Dynamic ◽  
Operating Conditions ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Supercritical Co2 Fluid ◽  
Membrane Contactors

This research answers the following question: What is the fluid dynamic behavior of a supercritical fluid (SCF) inside a membrane module? At this time, there is very little or no reported information that can provide an answer to this question. The research studies related to the themes of supercritical CO2 (SC-CO2), hollow fiber membrane contactors (HFMCs), and numerical simulations have mainly reported on 2D simulations, but in this work, 3D profiles are presented. Simulations were performed based on the experimental results and other simulations, using the geometry of a commercial module. The results were mainly based on the different operating conditions and geometric dimensions. A mesh study was performed to ensure the mesh non-dependence of the results presented here. It was observed that the velocity profile developed at 10 mm from the wall of the supercritical CO2 entrance pipe. A profile equilibrium around the fiber close to the entrance of the module was achieved in the experimental hollow fiber membrane contactor when compared to the case of the commercial hollow fiber membrane contactor. The results of this research provided a visualization of the boundary layer, which did not cover the entire fiber length. Finally, the results of this paper are interesting for technical applications and contribute to our understanding of the hydrodynamics of SCFs.

scholarly journals Experimental and Modeling study of the CO2 absorption performance into DEEA solution in membrane contactor

2021 ◽  
Author(s):  
Yihan Yin ◽  
Aoqian Qiu ◽  
Hongxia Gao ◽  
Zhiwu Liang ◽  
Wilfred Olso ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Co2 Concentration ◽  
Simulation Software ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Element Analysis ◽  
Good Agreement

In this study, the absorption process of the aqueous DEEA solution for CO2 capture in polytetrafluoroethylene hollow-fiber membrane contactor was investigated by both experiment and simulation. Based on the finite element analysis method, a two-dimensional steady-state mathematical model was established using COMSOL Multiphysics simulation software to calculate the CO2 mass transfer flux (JCO2) of DEEA in the hollow fiber membrane contactor under non-wetting and partial wetting conditions and the distribution of CO2 concentration under corresponding conditions. The results show that the predicted JCO2 under 15% membrane wetting conditions is in good agreement with the experimental value, and the mass transfer performance is severely reduced under wetting conditions. In addition, a dimensionless equation was developed to predict the liquid phase, gas phase and membrane phase mass transfer coefficient and JCO2. The calculated JCO2 values are in good agreement with the experimental values with the average relative deviation (AARD) of 9.4%.

scholarly journals Simulation of Carbon Dioxide Removal by Three Amine Mixture of Diethanolamine, Methyldiethanolamine, and 2-Amino- 2-Methyl-1-Propanol in a Hollow Fiber Membrane Contactor Using Computational Fluid Dynamics

2017 ◽  
Vol 61 (3) ◽  
pp. 227
Author(s):  
Pedram Bahrami Moghim ◽  
Toraj Mohammadi
Keyword(s):  
Carbon Dioxide ◽  
Removal Efficiency ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Structural Parameters ◽  
Carbon Dioxide Removal ◽  
Membrane Contactor ◽  
Fiber Membrane ◽  
Amine Solution ◽  
Simulation Results

The present paper investigates the simulation of carbon dioxide removal from natural gas stream by a mixture of three amines of diethanolamine (DEA), methyldiethanolamine (MDEA), and 2-amino- 2-methyl-1-propanol (AMP) in a hollow fiber membrane contactor made from polypropylene using finite volume method (FVM). The effect of structural parameters of length and thickness of membrane and diameter of shell on the removal efficiency was studied and the optimized values were calculated. The calculations were made with the assumption of two-dimensional symmetric geometry and compared with those of three-dimensional one. The effect of number and size of the meshes on the simulation results was also studied. The simulation results were validated against the experimental values from the literature. The results imply that the increase in the length and decrease in the thickness of membrane enhances the removal efficiency. As a result, higher quantities of carbon dioxide are transferred from the shell to the membrane and amine solution inside the tube which decreases the effluent CO2 of shell and increases the average concentration of CO2 in the membrane and tube sides. The changes in effluent CO2 of shell with respect to amine solution concentration and influent CO2 indicate the insignificant influence of influent CO2 concentration on the removal efficiency.

scholarly journals CO2 Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 496
Author(s):  
Sayali Ramdas Chavan ◽  
Patrick Perré ◽  
Victor Pozzobon ◽  
Julien Lemaire
Keyword(s):  
Hollow Fiber ◽  
Recovery Rate ◽  
Hollow Fiber Membrane ◽  
Operating Conditions ◽  
Co2 Removal ◽  
Co2 Absorption ◽  
Fiber Membrane ◽  
Residual Content ◽  
Membrane Contactors ◽  
Ph Swing

Recently, membrane contactors have gained more popularity in the field of CO2 removal; however, achieving high purity and competitive recovery for poor soluble gas (H2, N2, or CH4) remains elusive. Hence, a novel process for CO2 removal from a mixture of gases using hollow fiber membrane contactors is investigated theoretically and experimentally. A theoretical model is constructed to show that the dissolved residual CO2 hinders the capacity of the absorbent when it is regenerated. This model, backed up by experimental investigation, proves that achieving a purity > 99% without consuming excessive chemicals or energy remains challenging in a closed-loop system. As a solution, a novel strategy is proposed: the pH Swing Absorption which consists of manipulating the acido–basic equilibrium of CO2 in the absorption and desorption stages by injecting moderate acid and base amount. It aims at decreasing CO2 residual content in the regenerated absorbent, by converting CO2 into its ionic counterparts (HCO3− or CO32−) before absorption and improving CO2 degassing before desorption. Therefore, this strategy unlocks the theoretical limitation due to equilibrium with CO2 residual content in the absorbent and increases considerably the maximum achievable purity. Results also show the dependency of the performance on operating conditions such as total gas pressure and liquid flowrate. For N2/CO2 mixture, this process achieved a nitrogen purity of 99.97% with a N2 recovery rate of 94.13%. Similarly, for H2/CO2 mixture, a maximum H2 purity of 99.96% and recovery rate of 93.96% was obtained using this process. Moreover, the proposed patented process could potentially reduce energy or chemicals consumption.

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