Separation of crude oil
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How many separation towers are needed to isolate desired products such as gasoline and diesel from crude oil? Are the towers used for separating gasoline and diesel the same? ?
Generally, there are three columns: initial distillation, atmospheric pressure, and reduced pressure
A vacuum distillation unit can separate straight-run gasoline and diesel from crude oil; these are relatively stable products, and it is a simple distillation process. Generally, it goes through three columns: a primary distillation column (the unit we use now employs a flash column), an atmospheric pressure column, and a reduced pressure column ； The catalytic unit carries out catalytic cracking reactions, after which the cracked gasoline and cracked diesel are separated using a fractionation tower. Usually, gasoline and diesel are separated from a single tower, only at different extraction points.
Both gasoline and diesel are separated from the atmospheric tower; generally, such a tower has multiple side streams, with different products being extracted from each stream. The original poster should take a look at \"Petroleum Refining Engineering\".