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Praveen Linga - One of the best experts on this subject based on the ideXlab platform.

  • systematic evaluation of tetra n butyl ammonium bromide tbab for carbon dioxide Capture employing the clathrate process
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Weng Inn Chin, Praveen Linga
    Abstract:

    Hydrate based gas separation (HBGS) process for the Precombustion Capture of CO2 from a fuel gas mixture is a novel method being investigated among the carbon Capture and sequestration techniques to reduce CO2 emissions. The efficiency of the HGBS process can be improved by using promoters that reduce the formation pressure of mixed gas hydrates. In this study the effect of tetra-n-butyl ammonium bromide (TBAB) was systematically investigated at a constant temperature of 279.2 K and pressure of 6.0 MPa for different TBAB concentrations of 0.3, 1.0, 1.5, 2.0, and 3.0 mol %, respectively. The 0.3 mol % solutions had a relatively longer average induction time of 20.1 min but exhibited the highest total normalized gas uptake of 0.0104 (±0.0004) mol of gas/mol of water and highest separation factor of 41.51 (±6.391). On the other hand, the 1.0 mol % solution had very short average induction time (<0.5 min) and it had the highest hydrate growth rate of 60.8 (±9.89) mol of gas·min–1·m–3, with the separation fact...

  • thermodynamic and kinetic verification of tetra n butyl ammonium nitrate tbano3 as a promoter for the clathrate process applicable to Precombustion carbon dioxide Capture
    Environmental Science & Technology, 2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Stuti Datta, Praveen Linga
    Abstract:

    In this study, tetra-n-butyl ammonium nitrate (TBANO3) is evaluated as a promoter for Precombustion Capture of CO2 via hydrate formation. New hydrate phase equilibrium data for fuel gas (CO2/H2) mixture in presence of TBANO3 of various concentrations of 0.5, 1.0, 2.0, 3.0, and 3.7 mol % was determined and presented. Heat of hydrate dissociation was calculated using Clausius–Clapeyron equation and as the concentration of TBANO3 increases, the heat of hydrate dissociation also increases. Kinetic performance of TBANO3 as a promoter at different concentrations was evaluated at 6.0 MPa and 274.2 K. Based on induction time, gas uptake, separation factor, hydrate phase CO2 composition, and rate of hydrate growth, 1.0 mol % TBANO3 solution was found to be the optimum concentration at the experimental conditions of 6.0 MPa and 274.2 K for gas hydrate formation. A 93.0 mol % CO2 rich stream can be produced with a gas uptake of 0.0132 mol of gas/mol of water after one stage of hydrate formation in the presence of 1....

  • Systematic Evaluation of Tetra‑n‑butyl Ammonium Bromide (TBAB) for Carbon Dioxide Capture Employing the Clathrate Process
    2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Weng Inn Chin, Praveen Linga
    Abstract:

    Hydrate based gas separation (HBGS) process for the Precombustion Capture of CO2 from a fuel gas mixture is a novel method being investigated among the carbon Capture and sequestration techniques to reduce CO2 emissions. The efficiency of the HGBS process can be improved by using promoters that reduce the formation pressure of mixed gas hydrates. In this study the effect of tetra-n-butyl ammonium bromide (TBAB) was systematically investigated at a constant temperature of 279.2 K and pressure of 6.0 MPa for different TBAB concentrations of 0.3, 1.0, 1.5, 2.0, and 3.0 mol %, respectively. The 0.3 mol % solutions had a relatively longer average induction time of 20.1 min but exhibited the highest total normalized gas uptake of 0.0104 (±0.0004) mol of gas/mol of water and highest separation factor of 41.51 (±6.391). On the other hand, the 1.0 mol % solution had very short average induction time (

  • Thermodynamic and Kinetic Verification of Tetra‑n‑butyl Ammonium Nitrate (TBANO3) as a Promoter for the Clathrate Process Applicable to Precombustion Carbon Dioxide Capture
    2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Stuti Datta, Minghuang Yao, Praveen Linga
    Abstract:

    In this study, tetra-n-butyl ammonium nitrate (TBANO3) is evaluated as a promoter for Precombustion Capture of CO2 via hydrate formation. New hydrate phase equilibrium data for fuel gas (CO2/H2) mixture in presence of TBANO3 of various concentrations of 0.5, 1.0, 2.0, 3.0, and 3.7 mol % was determined and presented. Heat of hydrate dissociation was calculated using Clausius–Clapeyron equation and as the concentration of TBANO3 increases, the heat of hydrate dissociation also increases. Kinetic performance of TBANO3 as a promoter at different concentrations was evaluated at 6.0 MPa and 274.2 K. Based on induction time, gas uptake, separation factor, hydrate phase CO2 composition, and rate of hydrate growth, 1.0 mol % TBANO3 solution was found to be the optimum concentration at the experimental conditions of 6.0 MPa and 274.2 K for gas hydrate formation. A 93.0 mol % CO2 rich stream can be produced with a gas uptake of 0.0132 mol of gas/mol of water after one stage of hydrate formation in the presence of 1.0 mol % TBANO3 solution. Solubility measurements and microscopic images of kinetic measurements provide further insights to understand the reason for 1.0 mol % TBANO3 to be the optimum concentration

  • a new apparatus to enhance the rate of gas hydrate formation application to Capture of carbon dioxide
    International Journal of Greenhouse Gas Control, 2010
    Co-Authors: Praveen Linga, John A Ripmeester, Rajnish Kumar, Peter Englezos
    Abstract:

    Abstract A new apparatus employing a modular, mechanically agitated gas-inducing crystallizer is used to demonstrate the Capture of CO2 via hydrate crystallization. The crystallizer enhances the contact of hydrate forming gases with water and thus the rate of hydrate crystallization increases. Flue gas (CO2/N2) and fuel gas (CO2/H2) mixtures were used to represent post- and Precombustion Capture. A comparison between the rates of hydrate formation in different crystallizers is presented by defining a metric called the normalized rate of hydrate formation. The gas uptake and the separation efficiency for the fuel and flue gas mixtures were found to be greater compared to the results obtained in a smaller scale stirred tank reactor ( Kumar et al., 2009c , Linga et al., 2008 ). The gas uptake and CO2 recovery for flue gas mixture in the presence of THF obtained in this work was higher than that reported in the literature with tetra-n-butyl ammonium bromide and tetra-n-butyl ammonium fluoride ( Fan et al., 2009 , Li et al., 2009 ). Although hydrate crystallization is able to Capture CO2, the power required for mechanical agitation was found to be very significant. If the hydrate process is to be used industrially then hydrate crystallization must be carried out without mechanical agitation.

Rajnish Kumar - One of the best experts on this subject based on the ideXlab platform.

  • systematic evaluation of tetra n butyl ammonium bromide tbab for carbon dioxide Capture employing the clathrate process
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Weng Inn Chin, Praveen Linga
    Abstract:

    Hydrate based gas separation (HBGS) process for the Precombustion Capture of CO2 from a fuel gas mixture is a novel method being investigated among the carbon Capture and sequestration techniques to reduce CO2 emissions. The efficiency of the HGBS process can be improved by using promoters that reduce the formation pressure of mixed gas hydrates. In this study the effect of tetra-n-butyl ammonium bromide (TBAB) was systematically investigated at a constant temperature of 279.2 K and pressure of 6.0 MPa for different TBAB concentrations of 0.3, 1.0, 1.5, 2.0, and 3.0 mol %, respectively. The 0.3 mol % solutions had a relatively longer average induction time of 20.1 min but exhibited the highest total normalized gas uptake of 0.0104 (±0.0004) mol of gas/mol of water and highest separation factor of 41.51 (±6.391). On the other hand, the 1.0 mol % solution had very short average induction time (<0.5 min) and it had the highest hydrate growth rate of 60.8 (±9.89) mol of gas·min–1·m–3, with the separation fact...

  • thermodynamic and kinetic verification of tetra n butyl ammonium nitrate tbano3 as a promoter for the clathrate process applicable to Precombustion carbon dioxide Capture
    Environmental Science & Technology, 2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Stuti Datta, Praveen Linga
    Abstract:

    In this study, tetra-n-butyl ammonium nitrate (TBANO3) is evaluated as a promoter for Precombustion Capture of CO2 via hydrate formation. New hydrate phase equilibrium data for fuel gas (CO2/H2) mixture in presence of TBANO3 of various concentrations of 0.5, 1.0, 2.0, 3.0, and 3.7 mol % was determined and presented. Heat of hydrate dissociation was calculated using Clausius–Clapeyron equation and as the concentration of TBANO3 increases, the heat of hydrate dissociation also increases. Kinetic performance of TBANO3 as a promoter at different concentrations was evaluated at 6.0 MPa and 274.2 K. Based on induction time, gas uptake, separation factor, hydrate phase CO2 composition, and rate of hydrate growth, 1.0 mol % TBANO3 solution was found to be the optimum concentration at the experimental conditions of 6.0 MPa and 274.2 K for gas hydrate formation. A 93.0 mol % CO2 rich stream can be produced with a gas uptake of 0.0132 mol of gas/mol of water after one stage of hydrate formation in the presence of 1....

  • Systematic Evaluation of Tetra‑n‑butyl Ammonium Bromide (TBAB) for Carbon Dioxide Capture Employing the Clathrate Process
    2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Weng Inn Chin, Praveen Linga
    Abstract:

    Hydrate based gas separation (HBGS) process for the Precombustion Capture of CO2 from a fuel gas mixture is a novel method being investigated among the carbon Capture and sequestration techniques to reduce CO2 emissions. The efficiency of the HGBS process can be improved by using promoters that reduce the formation pressure of mixed gas hydrates. In this study the effect of tetra-n-butyl ammonium bromide (TBAB) was systematically investigated at a constant temperature of 279.2 K and pressure of 6.0 MPa for different TBAB concentrations of 0.3, 1.0, 1.5, 2.0, and 3.0 mol %, respectively. The 0.3 mol % solutions had a relatively longer average induction time of 20.1 min but exhibited the highest total normalized gas uptake of 0.0104 (±0.0004) mol of gas/mol of water and highest separation factor of 41.51 (±6.391). On the other hand, the 1.0 mol % solution had very short average induction time (

  • Thermodynamic and Kinetic Verification of Tetra‑n‑butyl Ammonium Nitrate (TBANO3) as a Promoter for the Clathrate Process Applicable to Precombustion Carbon Dioxide Capture
    2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Stuti Datta, Minghuang Yao, Praveen Linga
    Abstract:

    In this study, tetra-n-butyl ammonium nitrate (TBANO3) is evaluated as a promoter for Precombustion Capture of CO2 via hydrate formation. New hydrate phase equilibrium data for fuel gas (CO2/H2) mixture in presence of TBANO3 of various concentrations of 0.5, 1.0, 2.0, 3.0, and 3.7 mol % was determined and presented. Heat of hydrate dissociation was calculated using Clausius–Clapeyron equation and as the concentration of TBANO3 increases, the heat of hydrate dissociation also increases. Kinetic performance of TBANO3 as a promoter at different concentrations was evaluated at 6.0 MPa and 274.2 K. Based on induction time, gas uptake, separation factor, hydrate phase CO2 composition, and rate of hydrate growth, 1.0 mol % TBANO3 solution was found to be the optimum concentration at the experimental conditions of 6.0 MPa and 274.2 K for gas hydrate formation. A 93.0 mol % CO2 rich stream can be produced with a gas uptake of 0.0132 mol of gas/mol of water after one stage of hydrate formation in the presence of 1.0 mol % TBANO3 solution. Solubility measurements and microscopic images of kinetic measurements provide further insights to understand the reason for 1.0 mol % TBANO3 to be the optimum concentration

  • a new apparatus to enhance the rate of gas hydrate formation application to Capture of carbon dioxide
    International Journal of Greenhouse Gas Control, 2010
    Co-Authors: Praveen Linga, John A Ripmeester, Rajnish Kumar, Peter Englezos
    Abstract:

    Abstract A new apparatus employing a modular, mechanically agitated gas-inducing crystallizer is used to demonstrate the Capture of CO2 via hydrate crystallization. The crystallizer enhances the contact of hydrate forming gases with water and thus the rate of hydrate crystallization increases. Flue gas (CO2/N2) and fuel gas (CO2/H2) mixtures were used to represent post- and Precombustion Capture. A comparison between the rates of hydrate formation in different crystallizers is presented by defining a metric called the normalized rate of hydrate formation. The gas uptake and the separation efficiency for the fuel and flue gas mixtures were found to be greater compared to the results obtained in a smaller scale stirred tank reactor ( Kumar et al., 2009c , Linga et al., 2008 ). The gas uptake and CO2 recovery for flue gas mixture in the presence of THF obtained in this work was higher than that reported in the literature with tetra-n-butyl ammonium bromide and tetra-n-butyl ammonium fluoride ( Fan et al., 2009 , Li et al., 2009 ). Although hydrate crystallization is able to Capture CO2, the power required for mechanical agitation was found to be very significant. If the hydrate process is to be used industrially then hydrate crystallization must be carried out without mechanical agitation.

Ponnivalavan Babu - One of the best experts on this subject based on the ideXlab platform.

  • systematic evaluation of tetra n butyl ammonium bromide tbab for carbon dioxide Capture employing the clathrate process
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Weng Inn Chin, Praveen Linga
    Abstract:

    Hydrate based gas separation (HBGS) process for the Precombustion Capture of CO2 from a fuel gas mixture is a novel method being investigated among the carbon Capture and sequestration techniques to reduce CO2 emissions. The efficiency of the HGBS process can be improved by using promoters that reduce the formation pressure of mixed gas hydrates. In this study the effect of tetra-n-butyl ammonium bromide (TBAB) was systematically investigated at a constant temperature of 279.2 K and pressure of 6.0 MPa for different TBAB concentrations of 0.3, 1.0, 1.5, 2.0, and 3.0 mol %, respectively. The 0.3 mol % solutions had a relatively longer average induction time of 20.1 min but exhibited the highest total normalized gas uptake of 0.0104 (±0.0004) mol of gas/mol of water and highest separation factor of 41.51 (±6.391). On the other hand, the 1.0 mol % solution had very short average induction time (<0.5 min) and it had the highest hydrate growth rate of 60.8 (±9.89) mol of gas·min–1·m–3, with the separation fact...

  • thermodynamic and kinetic verification of tetra n butyl ammonium nitrate tbano3 as a promoter for the clathrate process applicable to Precombustion carbon dioxide Capture
    Environmental Science & Technology, 2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Stuti Datta, Praveen Linga
    Abstract:

    In this study, tetra-n-butyl ammonium nitrate (TBANO3) is evaluated as a promoter for Precombustion Capture of CO2 via hydrate formation. New hydrate phase equilibrium data for fuel gas (CO2/H2) mixture in presence of TBANO3 of various concentrations of 0.5, 1.0, 2.0, 3.0, and 3.7 mol % was determined and presented. Heat of hydrate dissociation was calculated using Clausius–Clapeyron equation and as the concentration of TBANO3 increases, the heat of hydrate dissociation also increases. Kinetic performance of TBANO3 as a promoter at different concentrations was evaluated at 6.0 MPa and 274.2 K. Based on induction time, gas uptake, separation factor, hydrate phase CO2 composition, and rate of hydrate growth, 1.0 mol % TBANO3 solution was found to be the optimum concentration at the experimental conditions of 6.0 MPa and 274.2 K for gas hydrate formation. A 93.0 mol % CO2 rich stream can be produced with a gas uptake of 0.0132 mol of gas/mol of water after one stage of hydrate formation in the presence of 1....

  • Systematic Evaluation of Tetra‑n‑butyl Ammonium Bromide (TBAB) for Carbon Dioxide Capture Employing the Clathrate Process
    2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Weng Inn Chin, Praveen Linga
    Abstract:

    Hydrate based gas separation (HBGS) process for the Precombustion Capture of CO2 from a fuel gas mixture is a novel method being investigated among the carbon Capture and sequestration techniques to reduce CO2 emissions. The efficiency of the HGBS process can be improved by using promoters that reduce the formation pressure of mixed gas hydrates. In this study the effect of tetra-n-butyl ammonium bromide (TBAB) was systematically investigated at a constant temperature of 279.2 K and pressure of 6.0 MPa for different TBAB concentrations of 0.3, 1.0, 1.5, 2.0, and 3.0 mol %, respectively. The 0.3 mol % solutions had a relatively longer average induction time of 20.1 min but exhibited the highest total normalized gas uptake of 0.0104 (±0.0004) mol of gas/mol of water and highest separation factor of 41.51 (±6.391). On the other hand, the 1.0 mol % solution had very short average induction time (

  • Thermodynamic and Kinetic Verification of Tetra‑n‑butyl Ammonium Nitrate (TBANO3) as a Promoter for the Clathrate Process Applicable to Precombustion Carbon Dioxide Capture
    2014
    Co-Authors: Ponnivalavan Babu, Rajnish Kumar, Stuti Datta, Minghuang Yao, Praveen Linga
    Abstract:

    In this study, tetra-n-butyl ammonium nitrate (TBANO3) is evaluated as a promoter for Precombustion Capture of CO2 via hydrate formation. New hydrate phase equilibrium data for fuel gas (CO2/H2) mixture in presence of TBANO3 of various concentrations of 0.5, 1.0, 2.0, 3.0, and 3.7 mol % was determined and presented. Heat of hydrate dissociation was calculated using Clausius–Clapeyron equation and as the concentration of TBANO3 increases, the heat of hydrate dissociation also increases. Kinetic performance of TBANO3 as a promoter at different concentrations was evaluated at 6.0 MPa and 274.2 K. Based on induction time, gas uptake, separation factor, hydrate phase CO2 composition, and rate of hydrate growth, 1.0 mol % TBANO3 solution was found to be the optimum concentration at the experimental conditions of 6.0 MPa and 274.2 K for gas hydrate formation. A 93.0 mol % CO2 rich stream can be produced with a gas uptake of 0.0132 mol of gas/mol of water after one stage of hydrate formation in the presence of 1.0 mol % TBANO3 solution. Solubility measurements and microscopic images of kinetic measurements provide further insights to understand the reason for 1.0 mol % TBANO3 to be the optimum concentration

C Pevida - One of the best experts on this subject based on the ideXlab platform.

  • predicting mixed gas adsorption equilibria on activated carbon for Precombustion co2 Capture
    Langmuir, 2013
    Co-Authors: Susana Garcia, J J Pis, F Rubiera, C Pevida
    Abstract:

    We present experimentally measured adsorption isotherms of CO2, H2, and N2 on a phenol–formaldehyde resin-based activated carbon, which had been previously synthesized for the separation of CO2 in a Precombustion Capture process. The single component adsorption isotherms were measured in a magnetic suspension balance at three different temperatures (298, 318, and 338 K) and over a large range of pressures (from 0 to 3000–4000 kPa). These values cover the temperature and pressure conditions likely to be found in a Precombustion Capture scenario, where CO2 needs to be separated from a CO2/H2/N2 gas stream at high pressure (∼1000–1500 kPa) and with a high CO2 concentration (∼20–40 vol %). Data on the pure component isotherms were correlated using the Langmuir, Sips, and dual-site Langmuir (DSL) models, i.e., a two-, three-, and four-parameter model, respectively. By using the pure component isotherm fitting parameters, adsorption equilibrium was then predicted for multicomponent gas mixtures by the extended ...

  • Predicting Mixed-Gas Adsorption Equilibria on Activated Carbon for Precombustion CO2 Capture
    2013
    Co-Authors: S. García, J J Pis, F Rubiera, C Pevida
    Abstract:

    We present experimentally measured adsorption isotherms of CO2, H2, and N2 on a phenol–formaldehyde resin-based activated carbon, which had been previously synthesized for the separation of CO2 in a Precombustion Capture process. The single component adsorption isotherms were measured in a magnetic suspension balance at three different temperatures (298, 318, and 338 K) and over a large range of pressures (from 0 to 3000–4000 kPa). These values cover the temperature and pressure conditions likely to be found in a Precombustion Capture scenario, where CO2 needs to be separated from a CO2/H2/N2 gas stream at high pressure (∼1000–1500 kPa) and with a high CO2 concentration (∼20–40 vol %). Data on the pure component isotherms were correlated using the Langmuir, Sips, and dual-site Langmuir (DSL) models, i.e., a two-, three-, and four-parameter model, respectively. By using the pure component isotherm fitting parameters, adsorption equilibrium was then predicted for multicomponent gas mixtures by the extended models. The DSL model was formulated considering the energetic site-matching concept, recently addressed in the literature. Experimental gas-mixture adsorption equilibrium data were calculated from breakthrough experiments conducted in a lab-scale fixed-bed reactor and compared with the predictions from the models. Breakthrough experiments were carried out at a temperature of 318 K and five different pressures (300, 500, 1000, 1500, and 2000 kPa) where two different CO2/H2/N2 gas mixtures were used as the feed gas in the adsorption step. The DSL model was found to be the one that most accurately predicted the CO2 adsorption equilibrium in the multicomponent mixture. The results presented in this work highlight the importance of performing experimental measurements of mixture adsorption equilibria, as they are of utmost importance to discriminate between models and to correctly select the one that most closely reflects the actual process

Peter Englezos - One of the best experts on this subject based on the ideXlab platform.

  • a new apparatus to enhance the rate of gas hydrate formation application to Capture of carbon dioxide
    International Journal of Greenhouse Gas Control, 2010
    Co-Authors: Praveen Linga, John A Ripmeester, Rajnish Kumar, Peter Englezos
    Abstract:

    Abstract A new apparatus employing a modular, mechanically agitated gas-inducing crystallizer is used to demonstrate the Capture of CO2 via hydrate crystallization. The crystallizer enhances the contact of hydrate forming gases with water and thus the rate of hydrate crystallization increases. Flue gas (CO2/N2) and fuel gas (CO2/H2) mixtures were used to represent post- and Precombustion Capture. A comparison between the rates of hydrate formation in different crystallizers is presented by defining a metric called the normalized rate of hydrate formation. The gas uptake and the separation efficiency for the fuel and flue gas mixtures were found to be greater compared to the results obtained in a smaller scale stirred tank reactor ( Kumar et al., 2009c , Linga et al., 2008 ). The gas uptake and CO2 recovery for flue gas mixture in the presence of THF obtained in this work was higher than that reported in the literature with tetra-n-butyl ammonium bromide and tetra-n-butyl ammonium fluoride ( Fan et al., 2009 , Li et al., 2009 ). Although hydrate crystallization is able to Capture CO2, the power required for mechanical agitation was found to be very significant. If the hydrate process is to be used industrially then hydrate crystallization must be carried out without mechanical agitation.

  • two stage clathrate hydrate membrane process for Precombustion Capture of carbon dioxide and hydrogen
    Journal of Environmental Engineering, 2009
    Co-Authors: Rajnish Kumar, Praveen Linga, John A Ripmeester, Peter Englezos
    Abstract:

    A hybrid process for the Capture of CO2 and H2 from a treated fuel gas mixture is presented. It consists of two hydrate crystallization stages operating at 273.7 K and 3.8 and 3.5 MPa, respectively. The CO2-lean stream from the first stage is directed to a membrane separation unit whereas the CO2-rich one is directed to the second hydrate stage. These operating pressures at the crystalli- zation stages are possible by adding 2.5% by mole propane. Propane enables the reduction in the hydrate formation pressure and thus reduces the cost associated with the compression of the fuel gas. The two hydrate stages would operate at 7.5 and 3.5 MPa without adding propane. This work provides the relevant kinetic data, as well as the separation efficiency and recoveries achieved.