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Most of the reaction rate equations for methanol dehydration are derived from the experiments conducted for crude methanol as feed and laboratory prepared catalysts, which are not exactly the same as industrial reactors conditions. In the present contribution, it is attempted to find suitable rate of reactions for pure methanol with no water as feed and commercial catalysts of HZSM-5 and γ-alumina at industrial conditions in methanol dehydration process. In addition, a comparison between the performances of the catalysts is performed. It is found that HZSM-5 has superior performances compared to the γ-alumina in terms of conversion. Modeling results are also indicated that the proposed rate of reaction predicts the behavior of the process, properly.