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

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

A six-step patented control strategy

- input/output transformations for interaction decoupling
- optimization and control of adsorption profiles
- maximization of paraxylene yield for a given extract purity
- prevention of extract pollution by Ethyl-Benzene
- compensation for changes in ambient temperature or feed composition
- throughput maximization

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.

The static gains used in the dynamic models are continuously estimated on-line, to compensate for the highly non linear behavior of the unit.

Benefits

- Improvement of operational stability
- Improvement of Paraxylene yield
- Constant Paraxylene purity
- Catalyst run length maximization
- Minimization of desorbent consumption
- Maximization of unit throughput