Flash Separations Interactive Simulations
These simulations were prepared using Mathematica. Download the free CDF player and download the simulation CDF file (links below). Try to predict the behavior when a parameter changes before using a slider to change that parameter. Screecasts are provided to explain how to use them.

Simulation: Adiabatic Flash Drum with Binary Liquid Feed

This simulation shows an adiabatic flash drum with a liquid feed stream containing a mixture of methanol and water. The feed mole fraction of methanol, the temperature, and the flash drum pressure can be modified with sliders. A bar graph shows the moles of water (blue) and methanol (green).

 

Try to answer these questions before manipulating the simulation:

  1. As temperature increases, how does V/F change, and how do the exit mole fractions change?
  2. As pressure increases, how does V/F/ change, and how do the exit mole fractions change?
     
https://sites.google.com/a/learncheme.com/learncheme/simulations/cdf-files/AdiabaticFlashDrumWithBinaryLiquidFeed.cdf?attredirects=0





Simulation: T-x-y and x-y Diagrams for Binary Vapor Liquid Equilibrium in a Flash Drum

The x-y diagram for vapor-liquid equilibrium is shown for a methanol/water stream fed to a flash drum. The corresponding T-x-y diagram shows how the points on the x-y diagram are obtained; each point corresponds to a different temperature. Use buttons to view the x-y and T-x-y diagrams separately or to view both simultaneously. The vapor/liquid ratio leaving the flash drum and the feed composition can be changed with the sliders. 

 

Try to answer these questions before manipulating the simulation:

  1. How does changing the L/V ratio affect the temperature of the flash drum and the exiting streams?
  2. What affect does changing the feed mole fraction of methanol have on the exiting streams, if any?