Efficiency evaluation of novel liquid potassium lysinate chemical solution for CO2 molecular removal inside the hollow fiber membrane contactor: Comprehensive modeling and CFD simulation

Nakhjiri, Ali Taghvaie; Heydarinasab, Amir

doi:10.1016/j.molliq.2019.111561

Cited by 38 publications

(18 citation statements)

References 41 publications

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“…Transport of carbon dioxide in the gas phase (steady state) where the liquid phase flows can be written by means of the following mass balance equation [35,39]:…”

Section: Tube Side's Equationsmentioning

confidence: 99%

Theoretical investigations on the effect of absorbent type on carbon dioxide capture in hollow-fiber membrane contactors

et al. 2020

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Chemical absorption of carbon dioxide from flue or natural gas in hollow-fiber membrane contactors (HFMCs) has been one of the most beneficial techniques to alleviate its emission into the environment. A theoretical research study was done to investigate the change in membrane specifications and operating conditions on CO 2 absorption using different alkanolamine solvents. The mathematical model was developed for a parallel counter-current fluid flow through a HFMC. The developed model's equations were solved based on finite element method. The simulations revealed that the increase in membrane porosity, length and the number of fibers has a positive impact on CO 2 removal, while the gas flow rate and tortuosity enhancement resulted in the reduction of CO 2 absorption. Furthermore, it was found that 4-diethylamino-2-butanol (DEAB) with approximately 100% CO 2 absorption is suggested as the best solvent in this system, but ethyl-ethanolamine (EEA) with only 46% CO 2 absorption had the lowest capacity for CO 2 absorption (DEAB>MEA>EDA>MDEA> EA>EEA). It is worth pointing out that the CO 2 absorption can be improved using EEA solvent via change in membrane specifications such as increase in membrane porosity, length and the number of fibres.

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“…Transport of carbon dioxide in the gas phase (steady state) where the liquid phase flows can be written by means of the following mass balance equation [35,39]:…”

Section: Tube Side's Equationsmentioning

confidence: 99%

Theoretical investigations on the effect of absorbent type on carbon dioxide capture in hollow-fiber membrane contactors

et al. 2020

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“…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%

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

Pishnamazi

Nakhjiri

Taleghani

et al. 2020

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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

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“…the employed PDEs [41][42][43]. In order to develop the modeling and its related CFD-based simulations, a system with a 64-bit operating capacity, an Intel core TM i5-6200U CPU at 2.30 GHz and an 8 Gigabyte RAM is employed.…”

Section: Plos Onementioning

confidence: 99%

Molecular separation of ibuprofen and 4-isobutylacetophenone using octanol organic solution by porous polymeric membranes

et al. 2020

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Molecular separation of pharmaceutical contaminants from water has been recently of great interest to alleviate their detrimental impacts on environment and human well-being. As the novelty, this investigation aims to develop a mechanistic modeling approach and consequently its related CFD-based simulations to evaluate the molecular separation efficiency of ibuprofen (IP) and its metabolite 4-isobutylacetophenone (4-IBAP) from water inside a porous membrane contactor (PMC). For this purpose, octanol has been applied as an organic phase to extract IP and 4-IBAP from the aqueous solution due to high solubility of solutes in octanol. Finite element (FE) technique is used as a promising tool to simultaneously solve continuity and Navier-Stokes equations and their associated boundary conditions in tube, shell and porous membrane compartments of the PMC. The results demonstrated that the application of PMC and liquid-liquid extraction process can be significantly effective due to separating 51 and 54% of inlet IP and 4-IBAP molecules from aqueous solution, respectively. Moreover, the impact of various operational / functional parameters such as packing density, the number of fibrous membrane, the module length, the membrane porosity / tortuosity, and ultimately the aqueous solution flow rate on the molecular separation efficiency of IP and 4-IBAP is studied in more details.

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Efficiency evaluation of novel liquid potassium lysinate chemical solution for CO2 molecular removal inside the hollow fiber membrane contactor: Comprehensive modeling and CFD simulation

Cited by 38 publications

References 41 publications

Theoretical investigations on the effect of absorbent type on carbon dioxide capture in hollow-fiber membrane contactors

Theoretical investigations on the effect of absorbent type on carbon dioxide capture in hollow-fiber membrane contactors

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

Molecular separation of ibuprofen and 4-isobutylacetophenone using octanol organic solution by porous polymeric membranes

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