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Absorption oil (also called absorber oil, scrubbing oil, wash oil) is low-boiling liquid hydrocarbon used to absorb or remove the higher-boiling liquid hydrocarbons from a gas stream. Typically, absorption oil is a hydrocarbon-based liquid that is contacted with a gas stream to remove higher boiling components, such as occurs in the recovery of natural gasoline from the gas stream (often referred to as the wet gas stream).

An absorption plant is a facility used to recover the condensable portion of the gas stream to remove acid gas stream. Typically, the absorption takes place in a counter-flow (countercurrent) vessel, where the gas stream enters the bottom of the vessel and flows upward through the absorption oil. The plant also includes the necessary ancillary thermal units to distill the absorbed hydrocarbons from the higher boiling absorption oil.

See also: Absorption, Absorption Processes, Gas Cleaning, Gas Processing, Gas Treating, Olamine Processes.