Evaporation and distillation - McCabe-Thiele analysis - Internal balances

6 important questions on Evaporation and distillation - McCabe-Thiele analysis - Internal balances

What can be assumed for many distillation columns?

Constant molar vapor and liquid flow in each section of the distillation column.
Since constant molar flow is assumed, energy balances are not necesary to consider.

To what does the McCabe-Thiele method profide a graphical solution?

McCabe-Thiele provides a graphical solution to the material balances and equilibrium relationships inside the column.

What is the rectifying section?

The rectifying section exists of the stage just above the feed stage and everything above that.
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What is the material balance over the stripping section for the envelope indicated in this figure?

which is also the operating line.

What effect can the feed have on the rectifying and stripping section?

It can increase the liquid flow in the stripping section and the vapor flow in the rectifying section.

What is the overall mass balance and liquid phase mass balance over the feed stage as shown in this picture?


with q the liquid fraction in the feed.

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