Alkylation

Either HF or sulfuric acid units would be covered. Details of three Alkylation APC sessions follow:

1. Alkylation operation and economics (80 minutes):

• Alkylation chemistry and equipment configurations.
• Operational considerations - HF safety, IC4 separation and recycle, inerts purging, Olefins/IC4 balance, dryer switching complications.
• Unit economics.
• Key reactor control handles.
• Reactor effluent flow, IC4 make-up.
• Separation control handles.
• NC4 purge, Isostripper reboiling, propane purge.

2. Inferential modeling (40 minutes):

Please note: If attendees have not taken the narrow cut fractionation training then the session would last 100 minutes.

• Modeling of alkylation feed stoichiometry.
• Modeling DIB product purities.
  • C3 and NC4 in IC4, IC4 in NC4, C5 in NC4, C4 and C5 in alkylate, Alkylate RVP.

3. Alkylation APC (40 minutes):

• Control issues:
  • Reactor stoichiometry.
  • Inerts removal.
• Control of IC4 make-up during dryer switching.
• Constraints and APC structure: CV’s, DV’s and MV’s.
• In the reactor, isostripper and depropanizer sections.