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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 tuber is a part of a plant that stores energy for later, and which plays a role in asexual vegetative reproduction. Strictly speaking, it is the tip of an underground stem, also called a rhizome, that swells with unused nutrients.