Kinetic Study of Methanol Dehydration to Dimethyl Ether in Catalytic Packed Bed Reactor over Resin

Abstract

Dimethyl ether (DME) is considered as a significant fuel alternative with a critical manufacturing process. Only a few authors have presented the kinetic analysis of attractive and alternative catalysts to Al 2 O 3 and/or zeolite in DME production, despite the fact that there is a large library of kinetic studies for these commercial catalysts. The purpose of this research was to contribute to this direction by conducting a catalytic test to determine kinetic parameters for methanol dehydration over sulfonic acid catalysts (resin). However, due to the relevance of the mathematical description of this process in the industry was also studied, a study of kinetics parameters and mathematical modeling of methanol dehydration in an atmospheric gas phase in a fixed bed reactor with a temperature range (90˚C -120˚C) was examined. The Langmuir-Hinshelwood (L-H) model provides the best fit to experimental data, with an excellent R 2 = 0.9997, and the experimental results were compared to those predicted by these models with very small deviations. The kinetic parameters were found to be in good agreement with the Arrhenius equation, with acceptable straight-line graphs. The activation energy E was computed and found to be 27.66 kJ/mole, with an average variation of 0.32 percent between the predicted and calculated results. Simple mathematical continuum models (plug flow reactor PFR) showed an acceptable agreement with the experimental data.

Kinetic Study of Ethanol Dehydration to Ethylene and Diethyl Ether in Catalytic Packed Bed Reactor Over ZSM-5 Catalyst

“…This phenomenon can be related to the nature of the proposed model, applied hypothesis, the negligible effect of the backward reaction term, considering constant velocity along the reactor, and the presence of laminar flow inside the reactor. Similar results are also obtained in the literature for the dehydration process [32].…”

“…The purpose behind using the above hypothesis is to reduce the complexity [41], [42]. Similar simplification analysis and kinetic models are also suggested in the literature [32], [35]. Required data for solving equation 37 was obtained from the work of Ghassan [27], and the rector data for the design equation was taken from the same reference, estimated values of the kinetic parameters are shown in Table 14.…”

“…Based on the restrictive assumptions presented above, the general mass balance can be written as follows: 𝑢 𝑠 𝑑𝐶 𝑖 𝑑𝑧 + 𝜌 𝐵 𝑅 𝑖 (𝐶. 𝑇) = 0 (27) Boundary conditions: 𝐶 𝑖 = 𝐶 𝑖0 at z = 0 (28) This model is used to analyse the concentration profile of ethanol along the length of the reactor; a graphical representation of the proposed reactor is shown in Figure 1. A similar analysis was considered in the literature for modeling the catalytic reactors [31], [32].…”

Analysis of the Process Parameter in Fluid Catalytic Cracking Unit for a Refining and Petrochemical Company in Nigeria

“…The procedure consists of a catalyst section in which the catalyst can be manipulated [3] and a fractionating section that operate together as an integrated processing unit. Another aspect of research that uses similar procedure is still in current study for example the work of [4] have adopted the catalytic unit in kinetic studies. Also the unit is so efficient that they process biofuels too [5].…”