APC - Isomerization

The isomerization advanced control package combines Axens' latest generation multivariable controller MVAC, with on line reactor models and optimizer, in association with inferentials; it is designed to maximize the benefits from isomerization process at the lowest operating cost. As a process licensor, catalyst manufacturer and advanced control technology supplier, Axens combines all the necessary expertise for successful isomerization APC projects.

A six-step control strategy is implemented

• adjustment of hydrogen make-up for adequate H2/HC ratio at isomerization reactor inlett
• control of isomerization reactor outlet temperatures at defined optimal targets
• recycle composition control the recycle composition targets can be adjusted to maximize light isomerate octane_number, or volume_x_octane_number
• minimization of stabilizer reboiler duty
• DIH pressure minimization
• DIH flooding control

On-line optimization

Assuming on-line feed analyzer is available, the isomerization optimization module will use Axens' reactor models to calculate optimal targets for reactor outlet temperatures. These targets are controlled by MVAC.

Benefits

• Mixed isomerate octane number increase
• Reduction of hydrogen make up
• Optimal use of catalyst
• Minimization of energy consumption