Chapter 2

Distillation Control
Variables
This chapter provides you with a concept drawing of a distillation column with all of the streams labeled.
Learning Objectives
When you have completed this chapter, you should be able to
1. Use the distillation column concept drawing for reference
and for communication with others about the key variables and control elements
2. Recognize the names of the inlet and outlet streams used
in a distillation system
3. Know the standard definition of reflux ratio
Distillation is the main unit operation in chemical engineering for the separation and purification of liquids and vapors.
A feed mixture of chemicals can be separated into the more
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