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APC - Eluxyl

The Eluxyl advanced control package combines Axens' latest generation multivariable controller MVAC with an on-line reaction model; it is designed to maximize the benefits from the Eluxyl process, in an environment with complex, slow and non-linear multivariable interactions.

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

A 6 step patented control strategy

  • input/output transformations for interaction decoupling & linearization
  • optimization and control of adsorption profile
    • to prevent extract pollution by EB
    • to control Paraxylene losses in the raffinate
  • maximization of Paraxylene yield for a given extract purity
  • maximization of extract / raffinate ratio
  • minimization of desorbent / feed ratio
  • feed forward compensation for changes in feed composition

apc eluxyl

The Eluxyl control package uses Axens' MVAC on-line optimization capability to push the unit as near as possible to the optimal operation of the adsorption unit.


  • Energy saving - 4%
  • Improvement of operational stability
  • Improvement of Paraxylene yield
  • Constant Paraxylene purity

apc eluxyl