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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.
design criteria around the coker to allow for easy placement of an additional pair of coke drums with minimal debottle-necking of existing assets. This decision is based upon future plans to construct either another sour-crude train or other projects to make more coker feedstock available from existing refinery units. These units utilise the benefit of being on-line and generating earnings to help pay for the future expansion projects. Incorporating distillate recycle in the processing scheme or at least designing the coker so that recycle technology can be added later at minimal cost is