Evaporation and distillation - Multistage distillation - Feasible distillation conditions

5 important questions on Evaporation and distillation - Multistage distillation - Feasible distillation conditions

Why is there an upper limit for feasable operating temperatures?

This is due to the thermal stability of the compounds. At a certain temperature the compound will decompose. Some are not even stable at their boiling temperature.

What is the maximum temperature that can be achieved with high-pressure steam? And for other media?

300oC and for other media this might be raised to 400oC

What is the lower limit in temperature for most distillation columns? And why?

40 to 50 oC, this is due to the fact that water is mostly used to cool. Below these temperatures that is not efficient.
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How can the opperating temperature be decreased?

By working in a vacuum the operating temperature can be decreased.

What is a minimum opperating pressure?

2mbar

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