December 15, 2019, 12:52:02 PM
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Topic: Temperature control on condensers?  (Read 406 times)

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TokiyoRio

  • Guest
Temperature control on condensers?
« on: September 11, 2019, 01:50:20 PM »
It says in my textbook that "Temperature control is unlikely to be effective for condensers, unless the liquid stream is subcooled". For Reboiler and Vaporizer control, it says later on that "As with condensers, temperature control is not effective, as the saturated vapor temperature is constant at constant pressure".

My question is that if you have a two component mixture, why can you not use temperature control on the product stream as the difference between the dew and bubble temperatures are non-negligible?

johnsmith101

  • Guest
Re: Temperature control on condensers?
« Reply #1 on: September 26, 2019, 06:53:18 AM »
It just states that it's ineffictive. Plenty of multi-component operations utilize column overhead vapor temperature to the condenser and/or bottoms product temperature to "infer" product quality.

If I'm reading your statements correctly, you should never design the condenser / reboiler duties to control the condenser / reboiler outlet temperatures though. If you have a mixture of two or more components, the outlet temperature from condenser / reboiler will be somewhere between the bubble point and Dew point of the mixture (small range with little change with duty adjustments).

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