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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.
Depending on various circumstances, a coker addition can improve the ROE economics at least within a 2 - 3 % point range for the entire refinery. Increases above such levels have been demonstrated as well. 2.) An additional and variable element in the coker economics is the operating experience-based efficiency.