GPSA Ch. 16
| Parameter | Typical Range |
|---|---|
| Still Pressure | 30–75 psig |
| Reboiler Temperature | 350–450°F |
| Theoretical Stages | 4–12 |
| NGL Retention Target | 1–3% |
| Steam Rate | 0.3–1.0 lb/gal |
| Oil Loss | 0.02–0.10% |
Stripping Efficiency:
Typical stripping efficiency 85–98% depending on stages, temperature, and steam usage. Steam stripping allows lower reboiler temperatures while maintaining high NGL recovery.
Function: The oil purification still strips absorbed NGL (C₃+) from demethanized rich oil, producing lean oil for recirculation to the absorber and NGL product from the overhead.
Understand oil purification still design, steam stripping, and oil degradation prevention