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Overview of Crude Units. Crude units are the first units that process petroleum in any refinery. There objective is to. separate the mixture into several fractions like naphtha, kerosene, diesel and gas oil. A. schematic diagram of an atmospheric crude fractionation unit is shown in Figure 1-1. Crude. water.
A refiner's choice of crude oil will be influenced by the type of processing units at the refinery. Refineries fall into three broad categories. The simplest is a topping plant, which consists only of a distillation unit and probably a catalytic reformer to provide octane.