The Prime-G+ 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 Prime-G+ process at the lowest operating cost.

As process licensor, catalyst manufacturer and advanced control technology supplier, Axens combines all the necessary expertise for successful Prime-G+ APC projects.

An eight-step control strategy

* Precise control of sulfur in HCN and LCN products
* Octane loss minimization
* Adjustment of hydrogen make-up for optimal H2/HC ratio in the reactor sections
* Control of reactor bed outlet temperatures
* Catalyst deactivation monitoring
* Splitter pressure minimization
* LCN RVP control : minimization of splitter reboiler duty
* Throughput maximization

On-line optimization

The Prime-G+ optimization module uses Axens' reactor models to calculate optimal reactor operating conditions (MV and CV targets) to achieve the required desulfurization at minimum octane loss.
These targets are controlled by the MVAC.

Benefits

* Sulfur on spec with no over-hydrogenation
* Minimization of octane loss
* Catalyst run length maximization
* Reduction of hydrogen makeup
* Minimization of energy consumption