Journal of Catalysis p. 209 - 221 (2001)
Update date:2022-08-10
Topics:
Ray
Ziyang
Hidajat
Synthesis of MTBE by direct reaction between methanol and tert-butyl alcohol (TBA) on acid ion-exchange resin, Amberlyst 15, packed in a reactor was studied at 318-328 K and at different flow rates. A mathematical model based on a quasi-homogeneous kinetics was developed, assuming the reaction in the polymer phase to be homogeneous. H2O traveled more slowly than MTBE. The reaction rate increased with increasing reaction temperature, and the conversion of the limiting reactant, TBA, was favored at high temperatures and at low flow rates of TBA. The adsorption constant of H2O was almost 10 times greater than that of MTBE and as a result, the desired product MTBE always elutes faster than H2O. The effects of temperature on forward reaction constant, and reaction equilibrium constant were also explored. The activation energy for the reaction was 130.1 kJ/mole. The fitted parameters obtained for enthalpy and entropy of adsorption from Arrhenius plots were consistent with thermodynamics when the standard states were changed to liquid at 1 mole to pure gas at 1 atm. The accuracy of the proposed mathematical model was further verified when it was observed that the model could predict experimental results at different feed concentrations and flow rates quite well.
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