See below image for the Unit operation process diagram. A unit operation is defined as a process which does not involve any chemical reaction. Unit operations only deal with physical changes of the materials involved in the process. They are equipments which cause the materials to undergo physical changes. The physical changes are carried out for variety of purposes.
Processes are often represented as interconnected process units consisting of mixers, reactors, splitters, and separators among other unit operations. Recall the vinyl chloride production process from the last chapter:
Unit operation is a basic step in a process that involves physical change or chemical transformation during the process like polymerization separation, evaporation crystallization, filtration, isomerization, and other reactions. Explanation – In the above process, only separation is taking place which will be done base on density difference.