The R2R advanced control package combines Axens' latest generation multivariable controller MVAC, in association with on line inferential technology; it is designed to maximize the benefits from R2R process, in an environment with difficult multivariable interactions.

As a process licensor and advanced control technology supplier, Axens combines all the necessary expertise for successful R2R APC projects.

A nine-step control strategy
* control of conversion by adjusting severity
* combustion control in both regenerators
* control of catalyst valve position, to keep unit stable and controllable
* protection of regenerator temperature constraints
* protection of air blower and WGC constraints
* control of fractionator product qualities
* control of fractionator bottom temperature (to prevent coking)
* protection of Gas Recovery Unit constraints (FG & LPG)
* throuput maximization

The R2R control package uses Axens' MVAC on-line optimization capability to push the unit as near as possible to specified targets. Economic optimization can also be implemented.

Axens' inferential technology is used for on-line estimation of main fractionator product qualities.

Benefits

* Maximization of unit throughput
* Improvement of product quality
* Improvement of yield of most valuable product
* Improvement of operational stability
* Safe protection of unit material constraints
* Minimization of energy consumption