Separation of carbon dioxide/methane mixtures by adsorption on a basic resin
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Separation of carbon dioxide/methane mixtures by adsorption on a basic resin José A. Delgado, · María A. Uguina · José L. Sotelo · Beatriz Ruíz · Marcio Rosário
Received: 14 February 2007 / Revised: 9 July 2007 / Accepted: 11 July 2007 / Published online: 20 September 2007 © Springer Science+Business Media, LLC 2007
Abstract In this work, the separation of carbon dioxide/methane mixtures by PSA using a basic resin (Amberlite IRA-900) has been studied. Adsorption equilibrium and kinetics of carbon dioxide and methane on a fixed-bed of this adsorbent have been measured, and a binary adsorption equilibrium isotherm has been obtained. The adsorbent deactivation with the number of adsorption-desorption cycles, and its regeneration, have also been analysed. A model based on the LDF approximation has been used to describe the experimental breakthrough curves. The applicability of the basic resin to the separation of carbon dioxide/methane mixtures has been studied in an experimental PSA setup using a single bed. The validity of the model used in the fixedbed study for simulating a PSA system has been checked by comparing the simulated and the experimental performance of the proposed PSA cycle. Keywords Carbon dioxide · Methane · Basic resin · Amberlite IRA-900 · Adsorption · Fixed-bed · PSA Abbreviations A b B b0 c D DL
parameter defined in (4) adsorption affinity, Pa−1 parameter defined in (4), K parameter defined in (4) concentration, mol m−3 diffusivity, m2 s−1 axial dispersion coefficient, m2 s−1
J.A. Delgado, () · M.A. Uguina · J.L. Sotelo · B. Ruíz · M. Rosário Department of Chemical Engineering, Universidad Complutense de Madrid, 28040, Madrid, Spain e-mail: [email protected]
E E0 f H kf KH ks N n P p Q q q∗ q qmax R Re rp Sc t T u y
parameter defined in (4) stagnant contribution to axial dispersion empirical interaction parameter adsorption enthalpy, J mol−1 external mass transfer coefficient, m s−1 Henry’s law constant, mol kg−1 Pa−1 lumped mass transfer coefficient, s−1 adsorption rate, mol m−3 s−1 parameter defined in (4) total pressure, Pa partial pressure, Pa volumetric flow rate, m3 s−1 adsorbed concentration, mol kg−1 adsorbed concentration in equilibrium with the gas phase, mol kg−1 average adsorbed concentration, mol kg−1 maximum adsorption capacity, mol kg−1 gas constant, 8.31 J mol−1 K−1 particle Reynolds number, uρg 2rp /μ particle radius, m Schmidt number, μ/(ρg Dm ) time, s temperature, K superficial velocity, m s−1 mole fraction in the gas phase
Greek symbols ε εp μ ρ τ
bed voidage fraction particle porosity gas viscosity, Pa s density, kg m−3 tortuosity
Subscripts and superscripts 0
initial
374
F g H i L m
Adsorption (2007) 13: 373–383
feed gas high pressure ith component low pressure molecular
1 Introduction Methane is the most important non-CO2 greenhouse gas responsible for global warming, and its warming effect is even higher than the one of carbon dioxide. Landfill gas (LFG) constitutes one of the main sources of methane emissions in many countries. This gas is released from
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