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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.
Petrochemical plants (plants using chemicals from petroleum as a raw material or feedstock) are usually located adjacent to an oil refinery to minimize transportation costs for the feedstocks produced by the refinery. Speciality chemical and fine chemical plants are usually much smaller and not as sensitive to location.he same chemical process can be used at more than one chemical plant, with possibly differently scaled capacities at each plant. Also, a chemical plant at a site may be constructed to utilize more than one chemical process, for instance to produce multiple products.