APC - Isomerization

APC uses a model-based predictive control technology that drives the process towards the desired targets through the manipulation of several variables simultaneously while observing all process constraints. APC has a proven track record in delivering business objectives: reducing energy costs, increasing yields and improving operability.

As a process licensor and catalyst supplier, Axens is well positioned to offer models and first-hand knowledge of the best strategies for APC projects.

Our control strategy for C₅-C₆ Isomerization consists of:

• H₂/HC control by adjustment of H₂ make-up to minimize Scrubber Hydrogen purge
• Optional Benzene Hydrogenation reactor: R1
• Prevention of outlet temperature excursions
• Isomerization Reactors: R2 and R3
• Control of temperature profile at optimal target
• DeIsoHexanizer column (DIH)
• Minimization of 2,3-DMB (2,3 dimethylbutane) in recycle:

- High octane component, retained in Light  Isomerate

• Minimization of MCP (Methylcyclopentane) in recycle:

- Isomerization inhibitor, purged in Heavy Isomerate

• Reflux ratio control by reboiler duty