Experimental investigation of CO2 removal from N2 by metal oxide nanofluids in a hollow fiber membrane contactor

Mohammaddoost, Hamed; Azari, Ahmad; Ansarpour, Meisam; Osfouri, Shahriar

doi:10.1016/j.ijggc.2017.12.012

Cited by 39 publications

(22 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [13], the process of using water-based nanoparticles as solvents was modeled considering diffusion in the radial and axial directions under dry-mode conditions (nonwetting). In [14], CO 2 was found to be absorbed by water that had been enhanced by nanoparticles, such as aluminum oxide, titanium oxide, and silica, in the concentration range of 0.05–0.2 wt%. In the study, the removal of CO 2 from a gas mixture of CO 2 /N 2 using nanofluids (metal oxide in distilled water) in a membrane liquid–gas contacting module was examined.…”

Section: Introductionmentioning

confidence: 99%

Chemical Absorption of CO2 Enhanced by Nanoparticles Using a Membrane Contactor: Modeling and Simulation

Ghasem

2019

Membranes

View full text Add to dashboard Cite

In the present work, membrane resistance was estimated and analyzed, and the results showed that total membrane resistance increased sharply when membrane pores were wetted. For further study, a two-dimensional (2D) mathematical model was developed to predict the chemical absorption of CO2 in aqueous methyldiethanolamine (MDEA)-based carbon nanotubes (CNTs) in a hollow fiber membrane (HFM) contactor. The membrane was divided into wet and dry regions, and equations were developed and solved using finite element method in COSMOL. The results revealed that the existence of solid nanoparticles enhanced CO2 removal rate. The variables with more significant influence were liquid flow rate and concentration of nanoparticles. Furthermore, there was a good match between experimental and modeling results, with the modeling estimates almost coinciding with experimental data. Solvent enhanced by solid nanoparticles significantly improved the separation performance of the membrane contactor. There was around 20% increase in CO2 removal when 0.5 wt% CNT was added to 5 wt% aqueous MDEA.

show abstract

Section: Introductionmentioning

confidence: 99%

Chemical Absorption of CO2 Enhanced by Nanoparticles Using a Membrane Contactor: Modeling and Simulation

Ghasem

2019

Membranes

View full text Add to dashboard Cite

show abstract

“…The gas flow in the shell side is described by the Happel's model. The simplifying assumptions considered in the model development are as below [36][37][38][39][40][41] : • Isothermal process and steady state circumstance;…”

Section: Model Developmentmentioning

confidence: 99%

“…The gas flow in the shell side is described by the Happel’s model. The simplifying assumptions considered in the model development are as below 36 – 41 : Isothermal process and steady state circumstance; It is assumed that CNTs are spherical and homogeneous; The gas phase through the shell follows the ideal behavior; Non-wetted condition in the micropores; The assumption of incompressible and Newtonian fluid flow of the CNTs water-based nanofluid; It is assumed that radial convection can be negligible; Henry's law is employed to interpret the gas phase-nanofluid equilibrium; …”

Section: Model Developmentmentioning

confidence: 99%

Molecular investigation into the effect of carbon nanotubes interaction with CO2 in molecular separation using microporous polymeric membranes

Pishnamazi

Nakhjiri

Taleghani

et al. 2020

Sci Rep

View full text Add to dashboard Cite

The use of nanofluids has been recently of great interest to separate acidic contaminants such as CO 2. The main objective of this research is to assess the influence of carbon nanotubes (CNTs) addition to distilled water on enhancing the CO 2 molecular separation through a porous membrane contactor (PMC). For this aim, a comprehensive model is developed based on non-wetted and counter-current operational modes to evaluate the principal mass and momentum transport equations in tube, membrane and shell compartments of PMC. Consequently, a CFD-based axisymmetrical simulation is implemented according to finite element technique (FET) to prognosticate the results. It is found from the results that the addition of 0.1 wt% carbon nanotubes (CNTs) particles to water significantly enhances the mass transfer and consequently the CO 2 molecular separation efficiency from 38 to 63.3%. This considerable enhancement can be justified due to the existence of two momentous phenomena including Brownian motion and Grazing effect, which enhance the mass transport of CO 2 molecules in the PMC. Moreover, the effect of CNTs concentration, some membrane's parameters such as number of hollow fibers and porosity and also some module's design parameters including module radius and length on the CO 2 separation performance are investigated in this paper as another highlight of the current work. Sustainable anthropogenic emission of greenhouse contaminants such as CO 2 and its pernicious influence on the atmosphere (i.e., global warming and acid rains) has been a global concern in developed and developing countries 1,2. Globally, it is estimated that several billion tons of CO 2 are being emitted into the atmosphere each year through burning fossil fuels 3. Human's industrial activities are verified to be the main reason for the increase in CO 2 amount and disturbance in atmospheric natural balance. Thus, it is vitally important to develop viable procedures for CO 2 sequestration 4. There are different processes for separation and removal of CO 2 from gas streams which need to be improved to obtain more efficient processes. Traditional techniques such as pressure swing adsorption, bubble columns, venture scrubbers, spray towers, and packed towers have recently been applied to eliminate CO 2 contaminants from gas streams. Apart from the superb advantages of conventional methods, such techniques suffer from disparate difficulties such as high capital/operating costs, risk of liquid overflow, frothing, entrainment, and channeling 5,6. The combination of gas absorption and membrane separation processes formed a modern technique which is known as the membrane gas separation (MGS) system. This technique is able to overcome the

show abstract

“…As mentioned before, the aqueous MEA solution is reacting with CO2 and absorbs it from the gas of the membrane side. This chemical reaction follows equation ( 6) and ( 7) [10] and the rate of this reaction can be calculated using equation (8). In the reaction term that is defined in the tube side of HFMC, K is the reaction rate coefficient and its value is given in Table 2.…”

Section: Simulationmentioning

confidence: 99%

Numerical Investigation on the Effect of Flow Parameters in CO2 Capturing Using Aqueous MEA Absorbent in HFMC Systems

2020

sjfst

View full text Add to dashboard Cite

Nowadays, CO2 as the product of fossil fuel combustions, is polluting the air and the human environment, and it causes global warming. To reduce the negative effect of CO2 presence, it should be removed from the air by capturing methods. Hollow fiber membrane contactor (HFMC) system is one of the most efficient method for CO2 capturing than the other feasible capturing methods. In the present paper an HFMC absorbing system has been simulated using COMSOL Multiphysics software and the effect of flow rates of gas and liquid on the amount of CO2 removal has been studied. Aqueous solution of Mono-ethanolamine (MEA) is entered as the absorbent liquid in the tubes, and CO2 is removed from the shell side by the diffusion phenomena by participating in the chemical reaction with MEA. The results show that the higher liquid flow rate the higher %CO2 removal from the inserted gas. Against this result, the percentage of CO2 removal decreases with increasing the gas flow rate as expected. Higher gas flow rate leads the gas velocity to higher values and less possibility of absorbing by the diffusion method. The rate of the CO2 removal variation with liquid flow rate is higher than the CO2 removal variation whit the gas flow rate.

show abstract

Experimental investigation of CO2 removal from N2 by metal oxide nanofluids in a hollow fiber membrane contactor

Cited by 39 publications

References 47 publications

Chemical Absorption of CO2 Enhanced by Nanoparticles Using a Membrane Contactor: Modeling and Simulation

Chemical Absorption of CO2 Enhanced by Nanoparticles Using a Membrane Contactor: Modeling and Simulation

Molecular investigation into the effect of carbon nanotubes interaction with CO2 in molecular separation using microporous polymeric membranes

Numerical Investigation on the Effect of Flow Parameters in CO2 Capturing Using Aqueous MEA Absorbent in HFMC Systems

Contact Info

Product

Resources

About