Science Direct Meoh Mtbe Equilibrium

MeOH

Fig. 3.3. Azeotropes, distillation border, and chemical equilibrium of the ternary system isobutene-MTBE-methanol at a pressure of 500 kPa ([18], reprinted from Chem. Eng. Sei., Vol 57, Beckmann et al., Pages 1525-1530, Copyright 2002, with permission from Elsevier Science)

Isobutene

Fig. 3.4. Conceptual design of an RD column for the decomposition of MTBE and the corresponding concentration profile calculated from thermodynamic considerations ([18], reprinted from Chem. Eng. Sei., Vol 57, Beckmann et al., Pages 1525-1530, Copyright 2002, with permission from Elsevier Science)

MTBE MeOH

Fig. 3.4. Conceptual design of an RD column for the decomposition of MTBE and the corresponding concentration profile calculated from thermodynamic considerations ([18], reprinted from Chem. Eng. Sei., Vol 57, Beckmann et al., Pages 1525-1530, Copyright 2002, with permission from Elsevier Science)

non-reactive stripping and rectifying sections. The corresponding ternary plot shows the concentration profile as a sequence of phase- or phase-and-chemical equilibrium stages. In the rectifying section, conventional distillation takes place leading to an azeotropic concentration of isobutene and methanol in the distillate. The concentration change in the reactive section coincides with the chemical equilibrium lines. Therefore, the composition of the ternary mixture crosses the border distillation line from the left to the right in downward direction. In the stripping section, isobutene is removed and a binary mixture of methanol/MTBE can be collected as the bottom product.

As discussed above, thermodynamic simplifications allow an easy description and, in turn, a good understanding of the fundamental mechanisms effective in RD.

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