Vapor Liquid Equilibrium (VLE)

The equilibrium between the liquid and vapor phases of the system to be subjected to distillation is represented by vapor liquid equilibrium (VLE) diagram. Distillation columns are designed based on boiling point properties in the mixture being separated. Thus, the size particularly height of distillation column are determined by VLE data for the mixture.

The above figure shows binary mixture that has uniform vapor liquid equilibrium that is relatively easy to separate.


About Author

Name : Pratiksha Shrestha

Ms. Shrestha holds masters degree in food engineering and bioprocess technology from Asian Institute of Technology (AIT) Thailand. She is currently working for Government of Nepal at Department of Food Technology and Quality Control (DFTQC), Kathmandu. She is also a teaching faculty in College of Applied food and Dairy Technology (CAFODAT) affiliated to Purbanchal university, Nepal.