Adsorber dynamics and optimal design of layered beds for multicomponent gas adsorption

Park, Jong Ho; Kim, Jong‐Nam; Cho, Soon Haeng; Kim, Jong Duk; Yang, Ralph T.

doi:10.1016/s0009-2509(98)00196-1

Cited by 111 publications

(72 citation statements)

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“…The exact values of the adsorbed amount depend on the type of activated carbon, as well as on the preparation and activation procedure. However, when comparing the values of the pure component isotherms presented in this paper with results measured on comparable materials, the adsorbed amounts agree quite well and show the same trends (Hwang et al 1991;Park et al 1998;Humayun and Tomasko 2000;SudibanFig. 9 Comparison of the binary adsorption of CO 2 (triangles) and H 2 (circles) on activated carbon at 25°C and 3.0 MPa predicted by IAST with the isotherm parameters of the pure Langmuir or Sips isotherms; Symbols: experimental results, solid lines: Sips IAST, dashed lines: Langmuir IAST driyo et al 2003;Shen et al 2010;Grande et al 2008;Lopes et al 2009).…”

Section: Discussionsupporting

confidence: 76%

Pure and binary adsorption of CO2, H2, and N2 on activated carbon

et al. 2011

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A new developing field of application for pressure swing adsorption (PSA) processes is the capture of CO 2 to mitigate climate change, especially the separation of CO 2 and H 2 in a pre-combustion context. In this process scheme the conditions of the feed to the separation step, namely a pressure of 3.5 to 4.5 MPa and a CO 2 fraction of around 40% are favorable for an adsorption based separation process and make PSA a promising technology. Among the commercial adsorbent materials, activated carbon is most suitable for this application. To evaluate the potential, to benchmark new materials, and for process development a sound basis of the activated carbon thermodynamic data is required, namely equilibrium adsorption isotherms of the relevant pure components and mixtures, Henry's constants and isosteric heats.In this work pure adsorption equilibria of CO 2 , H 2 and N 2 on commercial activated carbon (AP3-60 from Chemviron, Germany) are measured using a Rubotherm Magnetic Suspension Balance (MSB) (Bochum, Germany) in a wide temperature and pressure range. The data is used to fit the temperature dependent parameters of Langmuir and Sips (Langmuir-Freundlich) isotherms and to determine the Henry's constants as well as isosteric heats. Based on this evaluation different methods to evaluate the data are compared and discussed. With the pure isotherm parameters of the Sips isotherm binary adsorption is predicted using an empirical binary Sips equation and ideal adsorbed solution theory (IAST). The results are compared to binary measurements in the same MSB applying a gravimetricchromatographic method. Notation a parameter for temperature dependent description of n ∞ i [mmol/g] A specific surface of the adsorbent (Gibbs Adsorption isotherm) [m 2 /kg] A parameter for temperature dependent description of k i [1/MPa] b parameter for temperature dependent description of n ∞ i [J/mol] B parameter for temperature dependent description of k i [J/mol] c exponent in Sips isotherm [-] C parameter for temperature dependent description of H i [mmol/g/MPa] D parameter for temperature dependent description of H i [J/mol] E squared error from isotherm fitting [(mmol/g) 2 ] g weighting factor (final) [-] H Henry's constant [mmol/g/MPa] H heat of adsorption [kJ/mol] k isotherm equilibrium constant [1/MPa] m mass [g] M 1 weight at measuring point 1 [g] M 0 1 weight at measuring point 1 under vacuum [g] M molar mass [g/mol] n molar adsorption per unit mass of adsorbent [mmol/g] N number of experimental data points at one temperature (one component) [-] 50 Adsorption (2012) 18:49-65 p pressure [MPa] r weighting factor [-] R ideal gas constant [J/mol/K] S selectivity [-] t weighting factor [-] T Temperature [K] V Volume [cm 3 ] V 0 Volume of lifted metal parts and adsorbent [cm 3 ] V void Void volume of the adsorption system [cm 3 ] V 2 second virial coefficient for isotherm description [g/mmol] V 3 third virial coefficient for isotherm description [g 2 /mmol 2 ] w mass fraction [-] y mole fraction in fluid [-] z mole fraction in adsorbed ph...

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Section: Discussionsupporting

confidence: 76%

Pure and binary adsorption of CO2, H2, and N2 on activated carbon

et al. 2011

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“…It is thus common practice to use different layers of adsorbents to increase the loading of CO in the same column. This approach has also been applied in other separations [66,70,79,[154][155][156][157][158][159][160]. Consecutive layers of adsorbents can also be used to improve the productivity of kinetic adsorbents by adding a material that can be easily regenerated after the kinetic adsorbent [161,162].…”

Section: The Role Of the Adsorbent In Psamentioning

confidence: 99%

Advances in Pressure Swing Adsorption for Gas Separation

Grande

2012

ISRN Chemical Engineering

172

108

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Pressure swing adsorption (PSA) is a well-established gas separation technique in air separation, gas drying, and hydrogen purification separation. Recently, PSA technology has been applied in other areas like methane purification from natural and biogas and has a tremendous potential to expand its utilization. It is known that the adsorbent material employed in a PSA process is extremely important in defining its properties, but it has also been demonstrated that process engineering can improve the performance of PSA units significantly. This paper aims to provide an overview of the fundamentals of PSA process while focusing specifically on different innovative engineering approaches that contributed to continuous improvement of PSA performance.

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“…There are different publications concerning the study of the dynamic behaviour of layered beds (Jee et al, 2001;Park et al, 1998) and layered PSA (Ahn et al, 1999(Ahn et al, , 2001Park et al, 2000;Yang et al, 1995;Yang and Lee, 1998;Zhou et al, 2002) for the purification of hydrogen with the aim of getting a better understanding of the system and also seeking for optimal (or at least increased) performance. Nevertheless, the production cost of hydrogen should be reduced to implement it as an energy vector, either in energy production or as fuel, and thus, further improvements that reduce the capital and operating costs are yet crucial.…”

Section: Introductionmentioning

confidence: 99%