The crude oil distillation unit (CDU) is the first processing unit in nearly all petroleum refineries. The CDU distills the incoming crude oil into numerous fractions of different boiling ranges, every of which are then processed additional in the other refinery processing items. The CDU is often referred to as the atmospheric distillation unit as a result of it operates at slightly above atmospheric strain. Petroleum Product manufacture The incoming crude oil is preheated by exchanging heat with a few of the new, distilled fractions and other streams. It’s then desalted to remove inorganic salts (primarily sodium chloride). Following the desalter, the crude oil is further heated by exchanging heat with some of the recent, distilled fractions and other streams. It is then heated in a gas-fired furnace (fired heater) to a temperature of about 398 °C and routed into the bottom of the distillation unit. The cooling and condensing of the distillation tower overhead is offered partially by exchanging heat with the incoming crude oil and partially by either an air-cooled or water-cooled condenser.

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