Refinery crude oil desalting and dewatering mostly using two electrochemical desalination method , which combines the use of heat , add demulsifier and high voltage electric field several measures to make the crude oil emulsion breaking, water droplets coalescence and sedimentation separation .
Basic approaches generally as follows: the crude product first by boiling different requirements into different straight-run seed oil press, and according to the product quality requirements of the distillate to remove these non-ideal components ; or by chemical reaction conversion , generating the components required , and thus get a series of qualified petroleum products . Oil refinery must address the segmentation and various petroleum fractions in the process of separation problems . Distillation is a common and easiest to achieve the most economical means of separation .
Almost all refineries process crude oil equipment distilled ( commonly known as a leader ) , for example, topping distillation and vacuum distillation , etc. The so-called crude oil processing , referring to crude distillation purposes .