The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform

Sang-wook Park - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous absorption of carbon dioxide, sulfur dioxide, and nitrogen dioxide into aqueous 1, 8-diamino-p-menthane
    Korean Journal of Chemical Engineering, 2011
    Co-Authors: Kwang-joong Oh, Sang-wook Park
    Abstract:

    3 gaseous mixtures of CO2, SO2, and NO2 were simultaneously absorbed into 1, 8-diamino-p-menthane (DAM) in a stirred, semi-batch tank with a planar, gas-liquid interface within a range of 0–2.0 kmol/m3 of DAM, 0.05–0.3 atm of CO2, 0.0025–0.04 atm of SO2, and 298.15–323.15 K at a fixed NO2 of 0.001 atm to measure their total Molar Fluxes. Diffusivity and Henry constants of CO2, SO2, and NO2 were obtained using the reference data, measured by N2O analogy. The mass transfer coefficient of each gas, needed to obtain the absorption rate without a chemical reaction, was modified with viscosity of aqueous DAM solution. In CO2-SO2-NO2-DAM system accompanied by first-order reaction with respect to CO2 and instantaneous reactions with respect to SO2 and NO2, the enhancement factors of CO2 and SO2 were obtained by using an approximate solution of mass balances consisting of reaction regimes of two gases, one of which reacts instantaneously, and then, the enhancement factor of NO2 by comparing the instantaneous rates of SO2 and NO2. The observed values of the Molar Flux approached to the calculated values very well.

  • Simultaneous absorption of carbon dioxide, sulfur dioxide and nitrogen dioxide into aqueous 2-amino-2-methy-1-propanol
    Korean Journal of Chemical Engineering, 2011
    Co-Authors: Kwang-joong Oh, Sang-wook Park
    Abstract:

    The absorption mechanism of three acidic gases in alkali solution, such as the system of carbon dioxide, sulfur dioxide, and nitrogen dioxide in 2-amino-2-methyl-1-propanol (AMP), was used to predict the simultaneous absorption rates using the film theory. Diffusivity, Henry constant and mass transfer coefficient of each gas were used to obtain the theoretical enhancement factor of each component. The theoretical Molar Fluxe of each gas was obtained by an approximate solution of mass balances with reaction regions of the first order reaction of CO2 and instantaneous reactions of SO2 and NO2 in CO2-SO2-NO2-AMP system. From the comparison between the theoretical total Fluxes of these gases and the measured ones, the solubility and the reaction rate between each gas and AMP influenced its Molar Flux.

Paitoon Tontiwachwuthikul - One of the best experts on this subject based on the ideXlab platform.

  • mass transfer coefficients and correlation for co2 absorption into 2 amino 2 methyl 1 propanol amp using structured packing
    Industrial & Engineering Chemistry Research, 1998
    Co-Authors: Paitoon Tontiwachwuthikul
    Abstract:

    The volumetric overall mass transfer coefficient (KGav) for CO2 absorption into aqueous solutions of 2-amino-2-methyl-1-propanol (AMP) was investigated with an absorption column packed with laboratory structured packings. The KGav value was evaluated over ranges of main operating variables; that is, up to 10 kPa partial pressure of CO2, 46.2−96.8 kmol/(m2 h) gas Molar Flux, 6.1−14.6 m3/(m2 h) liquid loading, and 1.1−3.0 kmol/m3 liquid concentration. To allow the mass transfer data to be readily utilized, an empirical KGav correlation for this system was developed. The values of mass transfer coefficient for the CO2−AMP system using a random and the tested structured packings are also compared. For a given system and operating conditions, the structured packing provides, in general, more than eightfold higher overall KGav values compared with those of commercial random packings.

Kwang-joong Oh - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous absorption of carbon dioxide, sulfur dioxide, and nitrogen dioxide into aqueous 1, 8-diamino-p-menthane
    Korean Journal of Chemical Engineering, 2011
    Co-Authors: Kwang-joong Oh, Sang-wook Park
    Abstract:

    3 gaseous mixtures of CO2, SO2, and NO2 were simultaneously absorbed into 1, 8-diamino-p-menthane (DAM) in a stirred, semi-batch tank with a planar, gas-liquid interface within a range of 0–2.0 kmol/m3 of DAM, 0.05–0.3 atm of CO2, 0.0025–0.04 atm of SO2, and 298.15–323.15 K at a fixed NO2 of 0.001 atm to measure their total Molar Fluxes. Diffusivity and Henry constants of CO2, SO2, and NO2 were obtained using the reference data, measured by N2O analogy. The mass transfer coefficient of each gas, needed to obtain the absorption rate without a chemical reaction, was modified with viscosity of aqueous DAM solution. In CO2-SO2-NO2-DAM system accompanied by first-order reaction with respect to CO2 and instantaneous reactions with respect to SO2 and NO2, the enhancement factors of CO2 and SO2 were obtained by using an approximate solution of mass balances consisting of reaction regimes of two gases, one of which reacts instantaneously, and then, the enhancement factor of NO2 by comparing the instantaneous rates of SO2 and NO2. The observed values of the Molar Flux approached to the calculated values very well.

  • Simultaneous absorption of carbon dioxide, sulfur dioxide and nitrogen dioxide into aqueous 2-amino-2-methy-1-propanol
    Korean Journal of Chemical Engineering, 2011
    Co-Authors: Kwang-joong Oh, Sang-wook Park
    Abstract:

    The absorption mechanism of three acidic gases in alkali solution, such as the system of carbon dioxide, sulfur dioxide, and nitrogen dioxide in 2-amino-2-methyl-1-propanol (AMP), was used to predict the simultaneous absorption rates using the film theory. Diffusivity, Henry constant and mass transfer coefficient of each gas were used to obtain the theoretical enhancement factor of each component. The theoretical Molar Fluxe of each gas was obtained by an approximate solution of mass balances with reaction regions of the first order reaction of CO2 and instantaneous reactions of SO2 and NO2 in CO2-SO2-NO2-AMP system. From the comparison between the theoretical total Fluxes of these gases and the measured ones, the solubility and the reaction rate between each gas and AMP influenced its Molar Flux.

Laurence A. Belfiore - One of the best experts on this subject based on the ideXlab platform.

  • Effects of the collision integral, thermal diffusion, and the Prater number on maximum temperature in macroporous catalysts with exothermic chemical reaction in the diffusion-controlled regime
    Chemical Engineering Science, 2007
    Co-Authors: Laurence A. Belfiore
    Abstract:

    The classic Prater equation is useful to estimate intrapellet temperatures in packed catalytic tubular reactors when the dimensionless Prater number ?? is relatively small (i.e., the magnitude of ?? ??? 0.3). However, for strongly exothermic chemical reactions, both thermal diffusion and the temperature dependence of important physicochemical properties of reactive gas mixtures should be included in the analysis of coupled heat and mass transfer within macroporous catalytic pellets. In the diffusion-limited regime, intrapellet temperature increases could be much greater than those predicted by the Prater equation. The analysis of thermal diffusion in pseudo-binary Lennard-Jones gases with temperature-dependent physicochemical properties reveals that steady-state predictions for exothermic reactions might not be possible when the Prater number is on the order of unity, because core temperatures are more than one order of magnitude larger than temperatures on the external catalytic surface. For reference, the Prater equation predicts that the maximum intrapellet temperature is two-fold larger than that on the external catalytic surface when ?? = 1, which severely underestimates realistic temperature increases by a factor of 5 or 6 (i.e., when ?? = 1) for the synthesis of methanol from carbon monoxide and hydrogen. The largest increases in intrapellet temperature occur when all of the following conditions are satisfied; (i) chemical reactions are strongly exothermic, (ii) physicochemical properties of the reactive gas mixture exhibit temperature dependence, (iii) the Prater number approaches unity, and (iv) Soret diffusion enhances the Molar Flux of C ??? O (i.e., MWCO < MW" B " in pseudo-binary mixtures) into the central core of macroporous catalysts as a consequence of negative thermal diffusion coefficients. ?? 2006 Elsevier Ltd. All rights reserved.

Seyyed Mohammadreza Davoodi - One of the best experts on this subject based on the ideXlab platform.

  • investigation of the effect of magnetic field on mass transfer parameters of co2 absorption using fe3o4 water nanofluid
    Aiche Journal, 2017
    Co-Authors: Mohammad Hossein Karimi Darvanjooghi, Maedeh Pahlevaninezhad, Ali Abdollahi, Seyyed Mohammadreza Davoodi
    Abstract:

    In this study, the enhancement of physical absorption of carbon dioxide by Fe3O4-water nanofluid under the influence of AC and DC magnetic fields was investigated. Furthermore, a gas-liquid mass transfer model for single bubble systems was applied to predict mass transfer parameters. The coated Fe3O4 nanoparticles were prepared using co-percipitation method. The results from characterization indicated that the nanoparticles surfaces were covered with hydroxyl groups and nanoparticles diameter were 10–13 nm. The findings showed that the mass transfer rate and solubility of carbon dioxide in magnetic nanofluid increased with an increase in the magnetic field strength. Results indicated that the enhancement of carbon dioxide solubility and average Molar Flux gas into liquid phase, particularly in the case of AC magnetic field. Moreover, results demonstrated that mass diffusivity of CO2 in nanofluid and renewal surface factor increased when the intensity of the field increased and consequently diffusion layer thickness decreased. © 2016 American Institute of Chemical Engineers AIChE J, 63: 2176–2186, 2017