Estimation of Equilibrium-Adsorption Behavior at Cryogenic Temperatures of CO2 and N2 Using a Simple Predictive Tool
- Alireza Bahadori (Curtin University)
- Document ID
- Society of Petroleum Engineers
- SPE Projects, Facilities & Construction
- Publication Date
- June 2011
- Document Type
- Journal Paper
- 65 - 70
- 2011. Society of Petroleum Engineers
- 4.6 Natural Gas, 4.1.5 Processing Equipment, 4.1.2 Separation and Treating, 4.1.4 Gas Processing
- cryogenic temperature, adsorption, natural gas, microporous material
- 0 in the last 30 days
- 221 since 2007
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Conventionally, carbon dioxide (CO2) removal requires the use of a water-based amine solution and large absorber and regeneration towers. The capital and ongoing operational costs for this process are substantial, and the use (regeneration and disposal) of the amine solution can be problematic from the perspectives of both safety and the environment. Nitrogen (N2) can also be a problematic impurity in natural gas. Many researchers have been investigating the use of alternative gas-separation technologies (such as membranes and adsorption) targeted at removing N2 or CO2 from natural gas more efficiently. In this work, a simple-to-use predictive tool that is easier than existing approaches, is less complicated, and requires shorter computational times is applied to accurately predict the CO2 and N2-adsorption isotherms at low temperatures and pressures up to saturation for a commercial carbon molecular sieve as a function of temperature and partial pressure of these components. Accurate prediction of such data is useful in evaluating the feasibility of using pressure-swing adsorption to separate N2 and CO2 from natural gases at cryogenic temperatures. The proposed method showed consistently accurate results across the investigated wide pressure and temperature ranges, with an average absolute deviation of less than 1% for both N2 and CO2 compared to the existing Toth equation, which shows deviations of 3.5 and 1% for N2 and CO2, respectively. This simple-to-use approach can be of immense practical value for engineers and scientists to have a quick check on adsorption capacities of a given adsorbent at various temperatures and pressures without the necessity of any experimental measurements. In particular, natural-gas-process engineers would find the proposed approach to be user friendly, involving transparent calculations with no complex expressions.
|File Size||354 KB||Number of Pages||6|
Atkins, P. and de Paula, J. 2006. Physical Chemistry, 8th edition,212. New York: W.H. Freeman and Company.
Bahadori, A. 2009. Estimating water adsorption isotherms. HydrocarbonProcessing 88 (1): 55-56.
Bahadori, A. and Vuthaluru, H.B. 2009. New method accurately predicts carbondioxide equilibrium adsorption isotherms. International Journal ofGreenhouse Gas Control 3 (6): 768-772. doi:10.1016/j.ijggc.2009.07.003.
Bahadori, A. and Vuthaluru, H.B. 2010. Rapid Prediction of Carbon DioxideAdsorption Isotherms for Molecular Sieves Using Simple Correlation. SPE ProjFac & Const 5 (1): 17-21, SPE-122882-PA. doi: 10.2118/122882-PA.
Daiminger, U. and Lind, W. 2004. Adsorption Processes for Natural GasTreatment: A Technology Update. Iselin, New Jersey: EngelhardCorporation.
Doetsh, I.D., Ruthven, D.M., and Loughlin, K.F. 1974. Sorption and Diffusionof n-heptane in 5A Zeolite. Canadian Journal of Chemistry 52 (15): 2717. doi:10.1139/v74-396.
Dubinin, M.M. 1975. Physical adsorption of gases and vapors in micropores.In Progress in Surface and Membrane Science, ed. D.A. Cadenhead, J.F.Danielli, and M.D. Rosenberg, Vol. 9. New York: Academic Press.
Kaul, B.K. 1984. Correlation and prediction of adsorption isotherm for pureand mixed gases. Ind. Eng. Chem. Process Des. Dev. 23 (4):711. doi:10.1021/i200027a014.
Kidnay, A.J. and Parrish, W.R. 2006. Fundamentals of Natural GasProcessing. Boca Raton, Florida: CRC Press.
Langmuir, I. 1918. The Adsorption of Gases on Plane Surfaces of Glass, Micaand Platinum. J. Am. Chem. Soc. 40 (9): 1361-1403. doi:10.1021/ja02242a004.
Martinez, G. and Basmadjian, D. 1996. Toward a general gas adsorptionisotherm. Chemical Engineering Science 51 (7): 1043-1054.doi:10.1016/0009-2509(95)00350-9.
Pakseresht, S. Kazemeini M., and Akbarnejad, M.M. 2002. Equilibriumisotherms for CO, CO2, CH4 and C2H4 on the 5A molecular sieve by a simplevolumetric apparatus. Separation and Purification Technology 28 (1): 53-60. doi:10.1016/S1383-5866(02)00012-6.
Ruthven, D.M. 1984. Principles of Adsorption and AdsorptionProcesses. New York: John Wiley & Sons.
Ruthven, D.M. and Kaul, B.K. 1996. Adsorption of n-hexane and intermediatemolecular weight aromatic hydrocarbon on LaY zeolite. Ind. Eng. Chem.Res. 35 (6): 2060-2064. doi:10.1021/ie950666f.
Toth, J. 1971. State of equations of the solid-gas interface layers. ActaChim.Acad. Sci. Hung. 69: 311-328.
Watson, G., May, E.F., Graham, B.F., Trengove, R.D., and Chan, K.I. 2009.Equilibrium Adsorption Measurements of Pure Nitrogen, Carbon Dioxide, andMethane on a Carbon Molecular Sieve at Cryogenic Temperatures and HighPressures. Journal of Chemical & Engineering Data 54(9): 2701-2707. doi:10.1021/je900224w.