Adsorption control method and controller

B - Operations – Transporting – 01 – D

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B01D 53/04 (2006.01) B01D 53/047 (2006.01) B01D 53/30 (2006.01) C01B 3/56 (2006.01)

Patent

CA 2756517

The present invention provides a method and a control system for controlling an adsorbent bed unit in which an adsorbent bed concentration of an impurity within an adsorbent bed of the adsor-bent bed unit is measured. The adsorbent bed concentration is controlled by manipulating the feed cycle time during which an adsorbent bed is adsorbing the impurities to maintain the adsorbent bed concen-tration at a targeted adsorption bed concentration. The targeted ad-sorption bed concentration is determined such that the product impuri-ty concentration is maintained at product impurity concentration tar-gets. The method and control system can incorporate a supervisory level of control reactive to product impurity concentration levels and related targets to determine the targeted adsorption bed concentration and a primary level of control that calculates the feed cycle time based upon an error between the measured and targeted adsorption bed con- centrations. Proportional integral control can be used for such purpos-es.

La présente invention a pour objet un procédé et un système de commande permettant de commander une unité de lit adsorbant dans laquelle une concentration du lit adsorbant d'une impureté au sein d'un lit adsorbant de l'unité de lit adsorbant est mesurée. La concentration du lit adsorbant est commandée par la manipulation du temps de cycle d'alimentation pendant lequel un lit adsorbant adsorbe les impuretés pour maintenir la concentration du lit adsorbant à une concentration du lit d'adsorption ciblée. La concentration du lit d'adsorption ciblée est déterminée de telle sorte que la concentration en impureté de produit soit maintenue à des cibles de concentration en impureté de produit. Le procédé et le système de commande peuvent incorporer un niveau de commande de surveillance réactif à des niveaux de concentration en impureté de produit et des cibles associées pour déterminer la concentration du lit d'adsorption ciblée et un niveau de commande primaire qui calcule le temps de cycle d'alimentation sur la base d'une erreur entre les concentrations du lit d'adsorption mesurées et ciblées. La présente invention concerne également une commande intégrale proportionnelle pouvant être utilisée à de telles fins.

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