Conversion · Refining
Alkylation Unit
A unit that joins light gases from the cracker, such as butylene and isobutane, into alkylate, a clean high octane gasoline component.
What it does
Upgrades low value light gases into premium gasoline blending stock using a strong acid catalyst, either sulfuric acid or hydrofluoric acid.
Basics
| Feed | Propylene, butylenes, isobutane |
| Catalyst | Sulfuric acid (about 85 to 95%) or hydrofluoric acid |
| Product | Alkylate |
Common failures
- Acid release, a major safety hazard, especially with hydrofluoric acid
Troubleshooting
- Symptom
- Corrosion rising in the unit
- Likely cause
- Acid strength too low or water in the acid
- What to check
- Keep acid strength and moisture within limits