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Aspen Tutorial #3: Flash Separation
Outline:
• Adding a Flash Distillation Unit
• Updating the User Input
• Running the Simulation and Checking the Results
• Generating Txy Diagram

Problem Description:
A mixture containing 50.0 wt% acetone and 50.0 wt% water is to be separated into two streams -- one enriched in acetone and the other in water. The separation process consists of extraction of the acetone from the water into methyl isobutyl ketone (MIBK), which dissolves acetone but is nearly immiscible with water. The overall goal of this problem is to separate the feed stream into two streams which have greater than 90% purity of water and acetone respectively.

In this tutorial we will be building upon our existing simulation by adding a flash separation to our product stream. This unit operation can be used to represent a number of real life pieces of equipment including feed surge drums in refining processes and settlers as in this problem. A flash distillation (or separation) is essentially a one stage separation process and for our problem we are hoping to split our mixture into two streams; one composed of primarily water and acetone and one composed of primarily MIBK and acetone.

Adding a Flash Distillation Unit:
Open up your simulation from last tutorial which you have hopefully saved. Select the Separators tab in the Equipment Model Library.
We will be using a Flash3 separator using a rigorous vapor-liquid-liquid equilibrium to separate our stream for further purification.
Select the Flash3 separator and add one to your process flowsheet. Select the material stream from the stream library and add a product stream leaving the flash separator from the top side, the middle, and the bottom side (where the red arrows indicate a product is required). Do not add a stream to the feed location yet.
You can leave your stream table and stream conditions on the process flowsheet while working through this tutorial or you can remove them and add them back in at the end.

Thanks to the Prof. Rene Overney for the material for these tutorials.
courses.washington.edu/overney