Relative Volatility in a Non-Ideal System

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SUMMARY

The discussion focuses on the calculation of relative volatility in a non-ideal multicomponent mixture during distillation. The user calculated the activity coefficient at 60°C using the UNIFAC method and inquired whether relative volatility would remain constant with a temperature change of ±30°C. It was concluded that while relative volatility may not remain constant in a non-ideal vapor-liquid equilibrium (VLE) system, slight changes can be assumed for preliminary calculations. Detailed calculations using computational tools are recommended for accuracy.

PREREQUISITES
  • Understanding of non-ideal vapor-liquid equilibrium (VLE) systems
  • Familiarity with the UNIFAC method for calculating activity coefficients
  • Knowledge of distillation column operations
  • Basic principles of thermodynamics related to temperature effects on mixtures
NEXT STEPS
  • Research the impact of temperature variations on relative volatility in non-ideal systems
  • Explore advanced computational methods for distillation calculations
  • Learn about alternative methods for calculating activity coefficients beyond UNIFAC
  • Investigate the design and optimization of distillation columns for multicomponent mixtures
USEFUL FOR

Chemical engineers, process engineers, and researchers involved in distillation processes and thermodynamic modeling of non-ideal mixtures.

phantom19
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May I Ask Another Ques?

Because I want to know the distribution of component of a non-ideal multicomponent mixture in a distillation column, I had calculated the activity coefficient for a particular multicomponent system at a temperature, let's say 60 C.
Thus I can obtain its relative volatility afterwards.

The question is would the relative volatility of this substance change or stays approximately the same when the T is being increased or decreased by let's say 30 C , considering that this system is a non ideal VLE system? I am doing this part because I wish to know its overhead temperature and distillate's temperature...

If the answer is "No"..I have to recalculate the activity coefficient but this is rather tedious as I am using UNIFAC method to calculate activity coefficient..so can I just assume that the changes in relative volatility is slight upon changes in temperature?
 
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The thing to do is to do some scouting calculations using UNIFAC for some estimated conditions to get an idea how it plays out. Of course, using computers to do the detailed calculations does not require one to assume constant relative volatility.
 

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