A short description of a chemical processing unit will be provided. Write the name of the unit that matches the description.

1. Used to transfer material from one point to another in a chemical process. Examples include centrifugal, positive displacement, and diaphragm.

2. Performs separation based on differences in boiling points between components using a series of trays maintained at different temperatures.

3. Converts material from the gas phase into the liquid phase most commonly by cooling the gas stream.

4. Used to separate material in the solid phase from material in the liquid phase leaving behind a cake.