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Intrinsic Kinetics of Methanol Dehydration over Al2O3 Catalyst

Authors: Liang Zhang, Hai-Tao Zhang, W ei-Yong Ying, Ding-Ye Fang

Abstract:

Dehydration of methanol to dimethyl ether (DME) over a commercial Al2O3 catalyst was studied in an isothermal integral fixed bed reactor. The experiments were performed on the temperature interval 513-613 K, liquid hourly space velocity (LHSV) of 0.9-2.1h-1, pressures between 0.1 and 1.0 MPa. The effect of different operation conditions on the dehydration of methanol was investigated in a laboratory scale experiment. A new intrinsic kinetics equation based on the mechanism of Langmuir-Hinshelwood dissociation adsorption was developed for the dehydration reaction by fitting the expressions to the experimental data. An activation energy of 67.21 kJ/mol was obtained for the catalyst with the best performance. Statistic test showed that this new intrinsic kinetics equation was acceptable.

Keywords: catalyst, dimethyl ether, intrinsic kinetics, methanol

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1075625

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References:


[1] Y. Y. Zhu, S. R. Wang, X. L. Ge, Q. Liu, Z. Y. Luo, K. F. Cen, "Experimental study of improved two step synthesis for DME production," Fuel Process. Tech., pp. 424-429, 2010.
[2] A. Khaleel, "Methanol dehydration to dimethyl ether over highly porous xerogel alumina catalyst: Flow rate effect," Fuel Process. Tech., 2010.
[3] K. Mads, J. Finn, C. Roberta, C. Jamal and S. P. Gregory, "MeOH to DME in bubbling fluidized bed: experimental and modeling," The Canadian journal of chemical engineering, vol. 89, pp. 274-283, 2011.
[4] D. Kallo, Knozinger, H. Zur, "Dehydratisierung von alkoholen an aliminiumoksid, " Chem. Ing.Tech., vol. 39, pp. 676-680, 1967.
[5] F. Figueras, A. Nohl, L. Mourgues, Y. Trambouze, "Dehydration of methanol and tert-Butyl alcohol on silica-alumina," Trans. Faraday Soc., vol. 67, pp. 1155-1163, 1971.
[6] K. Klusacek, P. Schneider, "Stationary catalytic kinetics via surface concentrations from transient data methanol dehydration," Chem. Eng. Sci., vol. 37, pp. 1523-1528, 1982.
[7] G. Bercic, J. Levec, "Intrinsic and global reaction rate of methanol dehydration over ╬│-A12O3 Pellets," Ind. Eng. Chem. Res., vol. 31, pp. 1035-1040, 1992.
[8] W. Z. Lu, L. H. Teng, W. D. Xiao, "Simulation and experiment study of dimethyl ether synthesis from syngas in a fluidized-bed reactor," Chem. Eng. Sci., vol. 59, pp. 5455-5464, 2004.
[9] M. Mollavali, F. Yaripour, H. Atashi, S. Sahebdelfar, "Intrinsic kinetics study of dimethyl ether synthesis from methanol on ╬│-Al2O3 catalysts," Ind. Eng. Chem. Res., vol. 47, no. 9, pp. 3265-3273, 2008.
[10] E. Gerhard, reactions at solid surfaces. New Jersey: John Wiley & Sons, Inc. Press, 2009.
[11] P. Grigore, B. Grigore, G. Rodica, N. Natalia, "Methanol conversion to dimethyl ether over H-SAPO-34 catalyst," Ind. Eng. Chem. Res., vol. 48, no. 15, pp. 7065-7071, 2009.
[12] G. Schmitz, "Deshydration du Methanol Sur Silice-Alumine, " Chim. Phys., vol. 74, pp. 650-655, 1978.
[13] B, Solange, V. S. Rutger, "Theoretical Study of the Mechanism of Surface Methoxy and Dimethyl Ether Formation from Methanol Catalyzed by Zeolitic Protons," J. Phys. Chem., vol. 101, pp. 2292, 1997.