Technology Unit

The vapor exiting the stripper contains excess hydrogen, H2S (from desulfurization), and light hydrocarbons. This gas is cooled and sent to an amine treatment unit:

• Absorption: in the Amine process, the gas contacts an amine solution (e.g., monoethanolamine or diethanolamine) in an absorber column.
  H2S is absorbed (H₂S + R-NH₂ → R-NH₃⁺HS^-), while hydrogen and light hydrocarbons pass through as a purified stream.
• Regeneration: The H₂S-rich amine is heated in a regenerator, releasing H₂S (sent to a sulfur recovery unit, e.g., Claus process) and recycling the lean amine.
• Hydrogen Recycle: The purified hydrogen is recompressed and reheated, then returned to the Hot H₂ Stripper, minimizing hydrogen loss and operational  costs.