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Absorbent

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Toraj Mohammadi – 1st expert on this subject based on the ideXlab platform

  • experimental investigation and mathematical modeling of co2 sequestration from co2 ch4 gaseous mixture using mea and tea aqueous Absorbents through polypropylene hollow fiber membrane contactor
    Journal of Membrane Science, 2018
    Co-Authors: Ali Taghvaie Nakhjiri, Amir Heydarinasab, Omid Bakhtiari, Toraj Mohammadi

    Abstract:

    Abstract In the current study, experimental and mathematical results of a counter-current contact between CO2/CH4 gaseous mixture and aqueous liquid Absorbents (MEA and TEA) through a microporous polypropylene hollow fiber membrane contactor are presented to evaluate the sequestration percentage of CO2 acidic pollutant from gaseous mixture. One of the aims of this paper is to experimentally and mathematically study the effects of gas flow rate, aqueous liquid Absorbents’ flow rate and also inlet CO2 concentration on the removal efficiency of CO2. In order to carry out this, a two dimensional mathematical model is developed to predict the experimental results. The experimental results show that MEA Absorbent has higher superiority for efficient removal of CO2 acidic gas compared to TEA Absorbent. Based on the experimental results, the sequestration efficiency of CO2 from gaseous mixture applying MEA and TEA aqueous Absorbents is about 92% and 62%, respectively. The simulated results of CO2 sequestration in wide ranges of gas flow rate, inlet CO2 concentration and liquid Absorbents’ flow rate demonstrate an excellent agreement with those of experimentally measured ones with average absolute relative errors (AAREs) of 4.3%, 4.4% and 3.6% for employing MEA and 6.9%, 3.4% and 5.2% for using TEA Absorbents, respectively. Additionally, this article aims to study the influence of momentous operational parameters such as number of fibers, module length and also membrane porosity and tortuosity on the CO2 separation efficiency. Based on the experimental and the numerical simulated results, increase in the gas flow rate, the membrane tortuosity and the CO2 inlet concentration significantly deteriorates the sequestration efficiency of CO2 while increment of the fibers counts, the membrane module length, the membrane porosity and the liquid flow rate positively encourages the CO2 sequestration percentage.

  • modeling and simulation of co2 separation from co2 ch4 gaseous mixture using potassium glycinate potassium argininate and sodium hydroxide liquid Absorbents in the hollow fiber membrane contactor
    Journal of environmental chemical engineering, 2018
    Co-Authors: Ali Taghvaie Nakhjiri, Amir Heydarinasab, Omid Bakhtiari, Toraj Mohammadi

    Abstract:

    Abstract The emission of CO2 greenhouse gas is one of the most momentous causes of environmental problems such as global warming. Hence, the sequestration of CO2 acid gas from gaseous streams is considered as a mandatory process to control the detrimental impressions of CO2 emission. In the present investigation, a mathematical modeling and a two dimensional comprehensive simulation is developed with the aim of evaluating the removal performance of CO2 acid gas from CO2/CH4 gaseous mixture. As the novelty, potassium argininate (PA), potassium glycinate (PG) and sodium hydroxide (NaOH) are used as promising liquid solvents in the hollow fiber membrane contactor (HFMC) and the best absorbing agent for capturing CO2 is introduced. The validation of model predictions is implemented based on the comparison of simulation results of CO2 and experimental data using sodium hydroxide (NaOH) in a wide range of Absorbent temperature and liquid velocity. Comparison of experimental data and simulation results for CO2 flux in wide ranges of Absorbent (NaOH) temperature and Absorbent velocity illustrates excellent agreements with average deviations of less than 4% and 3.7%, respectively. On the basis of simulation results, potassium argininate (PA) shows higher CO2 separation efficiency compared with the other liquid solvents. The order for CO2 separation rate is PA > PG > NaOH. The results imply that increment in the operational parameters such as porosity, module length and liquid Absorbents velocity positively affect the separation percentage of CO2 while, increasing in gas velocity, membrane tortuosity and initial concentration of CO2 deteriorate the separation efficiency of CO2, considerably.

Ewan J Mcadam – 2nd expert on this subject based on the ideXlab platform

  • Controlling shell-side crystal nucleation in a gas–liquid membrane contactor for simultaneous ammonium bicarbonate recovery and biogas upgrading
    Journal of Membrane Science, 2020
    Co-Authors: Andrew J Mcleod, P Buzatu, Olivier Autin, Bruce Jefferson, Ewan J Mcadam

    Abstract:

    Abstract A gas–liquid hollow fibre membrane contactor (HFMC) process has been introduced for carbon dioxide (CO2) separation from biogas where aqueous ammonia (NH3) is used to chemically enhance CO2 absorption and initiate heterogeneous nucleation of the reaction product ammonium bicarbonate at the membrane–solvent interface. Aqueous ammonia Absorbents (2–7 M) were initially used in single pass for CO2 separation from a synthetic biogas where nucleation of ammonium bicarbonate crystals was observed at the perimeter of the micropores. Recirculation of the aqueous ammonia Absorbent encouraged the growth of ammonium bicarbonate crystals on the shell-side of the membrane that measured several microns in diameter. However, at high aqueous NH3 concentrations (3–7 M), lumen side crystallisation occurred and obstructed gas flow through the lumen of the HFMC. The suggested mechanism for lumen-side crystallisation was Absorbent breakthrough into the lumen due to pore wetting which was promoted by low Absorbent surface tension at high NH3 concentration. Preferential shell-side nucleation can therefore be promoted by (1) raising surface tension of the Absorbent and (2) selection of a membrane with a more regulated pore shape than the PTFE membrane used (d/L 0.065) as both actions can diminish solvent ingress into the pore. This was evidenced using 2 M NH3 Absorbent where shell-side crystallisation was evidenced without the onset of lumen side crystallisation. Raising surface tension through the inclusion of salt into the chemical Absorbent also promoted greater CO2 flux stability. Importantly, this study demonstrates that chemically enhanced HFMC are an attractive prospect for gas–liquid separation applications where reaction product recovery offers further economic value.

  • controlling shell side crystal nucleation in a gas liquid membrane contactor for simultaneous ammonium bicarbonate recovery and biogas upgrading
    Journal of Membrane Science, 2015
    Co-Authors: Andrew J Mcleod, P Buzatu, Olivier Autin, Bruce Jefferson, Ewan J Mcadam

    Abstract:

    Abstract A gas–liquid hollow fibre membrane contactor (HFMC) process has been introduced for carbon dioxide (CO2) separation from biogas where aqueous ammonia (NH3) is used to chemically enhance CO2 absorption and initiate heterogeneous nucleation of the reaction product ammonium bicarbonate at the membrane–solvent interface. Aqueous ammonia Absorbents (2–7 M) were initially used in single pass for CO2 separation from a synthetic biogas where nucleation of ammonium bicarbonate crystals was observed at the perimeter of the micropores. Recirculation of the aqueous ammonia Absorbent encouraged the growth of ammonium bicarbonate crystals on the shell-side of the membrane that measured several microns in diameter. However, at high aqueous NH3 concentrations (3–7 M), lumen side crystallisation occurred and obstructed gas flow through the lumen of the HFMC. The suggested mechanism for lumen-side crystallisation was Absorbent breakthrough into the lumen due to pore wetting which was promoted by low Absorbent surface tension at high NH3 concentration. Preferential shell-side nucleation can therefore be promoted by (1) raising surface tension of the Absorbent and (2) selection of a membrane with a more regulated pore shape than the PTFE membrane used (d/L 0.065) as both actions can diminish solvent ingress into the pore. This was evidenced using 2 M NH3 Absorbent where shell-side crystallisation was evidenced without the onset of lumen side crystallisation. Raising surface tension through the inclusion of salt into the chemical Absorbent also promoted greater CO2 flux stability. Importantly, this study demonstrates that chemically enhanced HFMC are an attractive prospect for gas–liquid separation applications where reaction product recovery offers further economic value.

Ali Taghvaie Nakhjiri – 3rd expert on this subject based on the ideXlab platform

  • experimental investigation and mathematical modeling of co2 sequestration from co2 ch4 gaseous mixture using mea and tea aqueous Absorbents through polypropylene hollow fiber membrane contactor
    Journal of Membrane Science, 2018
    Co-Authors: Ali Taghvaie Nakhjiri, Amir Heydarinasab, Omid Bakhtiari, Toraj Mohammadi

    Abstract:

    Abstract In the current study, experimental and mathematical results of a counter-current contact between CO2/CH4 gaseous mixture and aqueous liquid Absorbents (MEA and TEA) through a microporous polypropylene hollow fiber membrane contactor are presented to evaluate the sequestration percentage of CO2 acidic pollutant from gaseous mixture. One of the aims of this paper is to experimentally and mathematically study the effects of gas flow rate, aqueous liquid Absorbents’ flow rate and also inlet CO2 concentration on the removal efficiency of CO2. In order to carry out this, a two dimensional mathematical model is developed to predict the experimental results. The experimental results show that MEA Absorbent has higher superiority for efficient removal of CO2 acidic gas compared to TEA Absorbent. Based on the experimental results, the sequestration efficiency of CO2 from gaseous mixture applying MEA and TEA aqueous Absorbents is about 92% and 62%, respectively. The simulated results of CO2 sequestration in wide ranges of gas flow rate, inlet CO2 concentration and liquid Absorbents’ flow rate demonstrate an excellent agreement with those of experimentally measured ones with average absolute relative errors (AAREs) of 4.3%, 4.4% and 3.6% for employing MEA and 6.9%, 3.4% and 5.2% for using TEA Absorbents, respectively. Additionally, this article aims to study the influence of momentous operational parameters such as number of fibers, module length and also membrane porosity and tortuosity on the CO2 separation efficiency. Based on the experimental and the numerical simulated results, increase in the gas flow rate, the membrane tortuosity and the CO2 inlet concentration significantly deteriorates the sequestration efficiency of CO2 while increment of the fibers counts, the membrane module length, the membrane porosity and the liquid flow rate positively encourages the CO2 sequestration percentage.

  • modeling and simulation of co2 separation from co2 ch4 gaseous mixture using potassium glycinate potassium argininate and sodium hydroxide liquid Absorbents in the hollow fiber membrane contactor
    Journal of environmental chemical engineering, 2018
    Co-Authors: Ali Taghvaie Nakhjiri, Amir Heydarinasab, Omid Bakhtiari, Toraj Mohammadi

    Abstract:

    Abstract The emission of CO2 greenhouse gas is one of the most momentous causes of environmental problems such as global warming. Hence, the sequestration of CO2 acid gas from gaseous streams is considered as a mandatory process to control the detrimental impressions of CO2 emission. In the present investigation, a mathematical modeling and a two dimensional comprehensive simulation is developed with the aim of evaluating the removal performance of CO2 acid gas from CO2/CH4 gaseous mixture. As the novelty, potassium argininate (PA), potassium glycinate (PG) and sodium hydroxide (NaOH) are used as promising liquid solvents in the hollow fiber membrane contactor (HFMC) and the best absorbing agent for capturing CO2 is introduced. The validation of model predictions is implemented based on the comparison of simulation results of CO2 and experimental data using sodium hydroxide (NaOH) in a wide range of Absorbent temperature and liquid velocity. Comparison of experimental data and simulation results for CO2 flux in wide ranges of Absorbent (NaOH) temperature and Absorbent velocity illustrates excellent agreements with average deviations of less than 4% and 3.7%, respectively. On the basis of simulation results, potassium argininate (PA) shows higher CO2 separation efficiency compared with the other liquid solvents. The order for CO2 separation rate is PA > PG > NaOH. The results imply that increment in the operational parameters such as porosity, module length and liquid Absorbents velocity positively affect the separation percentage of CO2 while, increasing in gas velocity, membrane tortuosity and initial concentration of CO2 deteriorate the separation efficiency of CO2, considerably.