scholarly journals Intensification of CO2 absorption using MDEA-based nanofluid in a hollow fibre membrane contactor

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yan Cao ◽  
Zia Ur Rehman ◽  
Nayef Ghasem ◽  
Mohamed Al-Marzouqi ◽  
Nadia Abdullatif ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Polyvinylidene Fluoride ◽  
Mechanistic Model ◽  
Hollow Fibre ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Pure Solvent ◽  
Membrane Porosity ◽  
Experimental Works ◽  
Shell And Tube

AbstractPorous hollow fibres made of polyvinylidene fluoride were employed as membrane contactor for carbon dioxide (CO2) absorption in a gas–liquid mode with methyldiethanolamine (MDEA) based nanofluid absorbent. Both theoretical and experimental works were carried out in which a mechanistic model was developed that considers the mass transfer of components in all subdomains of the contactor module. Also, the model considers convectional mass transfer in shell and tube subdomains with the chemical reaction as well as Grazing and Brownian motion of nanoparticles effects. The predicted outputs of the developed model and simulations showed that the dispersion of CNT nanoparticles to MDEA-based solvent improves CO2 capture percentage compared to the pure solvent. In addition, the efficiency of CO2 capture for MDEA-based nanofluid was increased with rising MDEA content, liquid flow rate and membrane porosity. On the other hand, the enhancement of gas velocity and the membrane tortuosity led to reduced CO2 capture efficiency in the module. Moreover, it was revealed that the CNT nanoparticles effect on CO2 removal is higher in the presence of lower MDEA concentration (5%) in the solvent. The model was validated by comparing with the experimental data, and great agreement was obtained.

scholarly journals Review on the mass transfer performance of CO2 absorption by amine-based solvents in low- and high-pressure absorption packed columns

RSC Advances ◽  
2017 ◽  
Vol 7 (29) ◽  
pp. 17857-17872 ◽  
Author(s):  
Morteza Afkhamipour ◽  
Masoud Mofarahi
Keyword(s):  
Mass Transfer ◽  
High Pressure ◽  
Packed Columns ◽  
Co2 Absorption ◽  
Transfer Performance ◽  
Experimental Works

An overview on the experimental works for obtaining KGCO2aV for low- and high-pressure absorption packed columns.

scholarly journals Demonstrating Commercial Hollow Fibre Membrane Contactor Performance at Industrial Scale for Biogas Upgrading at a Sewage Treatment Works

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 172
Author(s):  
Sam Houlker ◽  
Tony Rutherford ◽  
Daniel Herron ◽  
Adam Brookes ◽  
Andrew Moore ◽  
...  
Keyword(s):  
Separation Efficiency ◽  
Membrane Integrity ◽  
Hollow Fibre ◽  
Co2 Separation ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Hollow Fibre Membrane ◽  
Fibre Membrane ◽  
Synthetic Gas ◽  
Pre Treatment

Hollow fibre membrane contactor (HFMC) technology has been developed for CO2 absorption primarily using synthetic gas, which neglects the critical impact that trace contaminants might have on separation efficiency and robustness in industrial gases. This study, therefore, commissioned a demonstration-scale HFMC for CO2 separation at a full-scale anaerobic digester facility to evaluate membrane integrity over six months of operation on real biogas. The CO2 capture efficiency identified using real biogas was benchmarked at comparable conditions on synthetic gas of an equivalent partial pressure, and an equivalent performance identified. Two HFMC were subsequently compared, one with and one without a pre-treatment stage that targeted particulates, volatile organic compounds (VOCs) and humidity. Similar CO2 separation efficiency was again demonstrated, indicating limited impact within the timescale evaluated. However, gas phase pre-treatment is advised in order to ensure robustness in the long term. Over longer-term operation, a decline in CO2 separation efficiency was observed. Membrane autopsy identified shell-side deposition, where the structural morphology and confirmation of amide I and II groups, indicated biofouling. Separation efficiency was reinstated via chemical cleaning, which demonstrated that proactive maintenance could minimise process risk.

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%.

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