In an atmospheric distillation or topping unit the extracted products are: LPG, naphtha, kerosene, light gas oil, heavy gas oil and atmospheric residuum.
all topping products are not final products they go to other units to be treated as final products with acrescented value.
LPG goes to amine units
Naphtha goes to a hydrotreater
Kerosene goes to a Merox Unit
Light gas oil goes to Hydrodesulphurisation unit
Heavy gas oil goes to a Catalytic cracking
Atmospheric residuum goes to a Vacuum unit.
In more complex configuratios there are other units which optimize the tranformation of bottom residues in more noble products
