Refrigerated Lean Oil Absorption PFD | Enhanced from Petroleum Learning Programs

Lean oil absorption is a physical separation process in which a gas stream is contacted counter-currently with a low-volatility hydrocarbon liquid (“lean oil” or “sponge oil” — typically heavy naphtha, kerosene, or light gas oil, MW ~100–200). Heavier gas components (C₂⁺, primarily C₃⁺) dissolve preferentially into the oil. The “rich oil” is then regenerated by distillation (stripper/deethanizer), recovering the absorbed components as products, and the regenerated “lean oil” is recycled.

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The Low-Temperature Lean Oil Absorption unit is designed specifically for ethane (C₂) recovery from a rich feed gas. Unlike conventional ambient-temperature absorbers, deep chilling dramatically improves ethane solubility in the absorption oil.

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