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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.
Alkylation unit, is one of the conversion processes used in the petroleum refineries. It is used to convert isobutane and low-molecular-weight alkenes (primarily a mixture of propene and butene) into an alkylate, a high octane gasoline component.The process occurs in presence of a strong acting acid as catalyst.ndeed, by 2010 there are some countries in the world without any installed alkylation unit. The product of the unit, the alkylate, is composed of a mixture of high-octane, branched-chain paraffinic hydrocarbons (mostly isoheptane and isooctane).