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A tailored application for R2R Units

The R2R advanced control package combines Axens Horizon' 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 Horizon 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

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

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


  • 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

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