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Received May 12, 2014
Accepted September 21, 2014
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Adsorption breakthrough dynamics of zeolites for ethylene recovery from fluid catalytic cracking fuel-gas
Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Korea 1Scottish Carbon Capture and Storage Centre, Institute for Materials and Processes, The University of Edinburgh, UK
Korean Journal of Chemical Engineering, May 2015, 32(5), 808-815(8), 10.1007/s11814-014-0279-9
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Abstract
The adsorption dynamics of zeolite 13X, 10X and 5A beds was investigated for recovering ethylene (C2H4) from fluidized catalytic cracking fuel-gas. As a feed gas, a ternary mixture (CH4 : C2H4 : C2H6) and a model FCC fuelgas (CH4 : C2H4 : C2H6 : C3H6 : N2 : H2) were used for breakthrough experiments. In the ternary mixture, the concentration profiles showed similar patterns in all zeolite beds. C2H4 showed higher adsorption affinity than the others in all zeolites and zeolite 5A had the highest adsorption capacity of C2H4. In the six-component mixture, the breakthrough curves in the zeolite 5A bed showed similar patterns to the results of the ternary mixture. Although weak adsorbates could be removed during the adsorption step, CH4 and N2 imparted a steric hindrance to the initial stage of C2H4 adsorption in the zeolite 5A bed. Since vacuum desorption contributed to producing a high purity of C2H4, a pressure vacuum swing adsorption process was recommended to recover C2H4.
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References
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Park YH, Moon DK, Kim YH, Ahn H, Lee CH, Adsorption, 20, 631 (2014)
Carter JW, Husain H, Chem. Eng. Sci., 29, 267 (1974)
Li G, Xiao P, Xu D, Webley PA, Chem. Eng. Sci., 66(9), 1825 (2011)
Bae YS, Lee CH, Carbon, 43, 95 (2005)
Jee JG, Kim MB, Lee CH, Chem. Eng. Sci., 60(3), 869 (2005)
Kim MB, Bae YS, Choi DK, Lee CH, Ind. Eng. Chem. Res., 45(14), 5050 (2006)
Chu XZ, Cheng ZP, Xiang XX, Xu JM, Zhao YJ, Zhang WG, Lu JS, Zhou YP, Zhou L, Moon DK, Lee CH, Int. J. Hydrog. Energy, 39(9), 4437 (2014)
Yang JY, Lee CH, AIChE J., 44(6), 1325 (1998)
Jee JG, Kim MB, Lee CH, Ind. Eng. Chem. Res., 40(3), 868 (2001)
