We just learned about the Desalter.
Another part of the way that oil is cleaned up or refined is called Distillation.
When a liquid is boiled, it turns into a gas called steam.
When the steam cools, it turns back into a liquid, which is called condensation.
The liquid boiling and condensing over and over and being collected in different places is called distillation.
(from: wikipedia - continuous distillation)
Kid Facts - Blast from the past: Rims