Crude oil as produced in the oil field is a complex mixture of hydrocarbons ranging from methane to asphalt, with varying proportions of paraffins, naphthenes, and aromatics. The objective of crude ...

The refinery heats crude oil until most of it evaporates and floats up a distillation column. What's left behind is a thick sludge of the heaviest hydrocarbons. Since various hydrocarbons evaporate ...

In January, one of the facility's crude distillation units ... In the last wave of U.S. refinery closures, which occurred between 2017 and 2022, nine crude oil refineries with a combined capacity ...