Production of Clean Transportation Fuel Dimethylether by Dehydration of Methanol Over Nafion Catalyst

Yıl 2008, Cilt: 21 Sayı: 2, 37 - 41, 25.03.2010

Dilek Varışlı Timur Doğu

Öz

Dimethylether (DME) which is a very attractive synthetic transportation fuel alternate is synthesized by the dehydration reaction of methanol over nafion as the catalyst. The objective is to test the activity of this catalyst in methanol dehydration reaction. Experiments carried out in a vapor phase flow reactor in a temperature range of 120-220oC and with a space time of 1.35 s.g/cm3 showed quite high activity of Nafion to produce DME, giving conversion values of about 0.4 at 220oC. An increase in temperature caused an increase in DME selectivity (reaching to one over 200 oC) and a decrease in formaldehyde selectivity.

 Keywords: Dimethylether, Nafion, Dehydration

 

Anahtar Kelimeler

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Kaynakça

• [1] Doğu, T., Varışlı, D., “Alcohols as alternates to petroleum for environmentally clean fuels and petrochemicals”, J.Turkish Chemistry, (in pres).
• [2] G.A. Olah, A. Goeppert and G.K.S. Prakash, “Beyond Oil and Gas: The Methanol Economy”, Wiley-VCH Verlag GmbH & Co., (2006).
• [3] Song, C., “Global challenges and strategies for control, conversion and utilization of CO2 for sustainable development involving energy, catalysis, adsorption and chemical processing”, Catal Today, 115: 2-32 (2006).
• [4] Ogawa, T., Inoue, N., Shikada, T., Ohno, Y., “Direct Dimethyl Ether Synthesis”, Journal of Natural Gas Chemistry, 12: 219-227 (2003).
• [5] Yaripour, F., Baghaei, F., Schmidt, I., Perregaard, J., “Catalytic dehydration of methanol to dimethyl ether (DME) over solid-acid catalysts”, Catalysis Communications, 6: 147-152 (2005).
• [6] Vishwanathan, V., Jun, K.-W., Kim, J.-W., Roh, H.- S., “Vapour phase dehydration of crude methanol to dimethyl ther over Na-modified H-ZSM-5 catalysts”, Applied Catalysis A: General, 276: 251-255 (2004).
• [7] An, W., Chuang, K.T., and Sanger, A.,R., “Dehydration of methanol to dimethyl ether by catalytic distillation”, The Canadian Journal of Chemical Engineering, 82 (5): 948-955 (2004).
• [8] Varisli, D., “Kinetic Studies for Dimethyl Ether and Diethyl Ether Production”, PhD Thesis, The Graduate School of Natural and Applied Sciences of METU,Ankara, 76-81 (2007).
• [9] Harmer, M., A., Farneth, W.E. and Sun, Q., “High surface area nafion resin/silica nanocomposites: A new class of solid acid catalyst”, J.Am.Chem.Soc.,118: 7708-7715 (1996).
• [10] Lien, H.L., Zhang, W.X., “Removal of metyl tertbutyl ether (MTBE) with Nafion”, J. Hazardous Mater., 144: 194-199 (2007).