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Support process units
In addition to the units that directly process hydrocarbons, a refinery will have a number of supporting units providing utilities and other services. These typically include:
- Gas plant - Separation of light ends (propane, butane) from refinery gas coming from distillation and all of the conversion units. Cracked gas will typically go to a dedicated unsaturated gas plant
- Acid gas recovery - Separation of H2S and CO2 from refinery gas
- Sulfur plant - Conversion of H2S to elemental sulfur
- Hydrogen production - Generation of hydrogen from natural gas or other hydrocarbons for use in hydrotreaters and hydrocrackers
- Hydrogen capture - Extraction of hydrogen from conversion unit gas
- Steam production - Generation of steam for process units
- Cooling water - Cooling water used in process units
- Waste water treating - Removal of contaminants from process and runoff water