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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.
While coke can be formed naturally, the commonly used form is man-made. The form known as petroleum coke, or pet coke, is derived from oil refinery coker units or other cracking processes. Coke is used in preparation of producer gas which is a mixture of carbon monoxide and nitrogen.