BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Multivariable control of the polymer molecular weight in emulsion 
 polymerization processes.
DTSTART:20101022T101500
DTSTAMP:20260510T053711Z
UID:093885e1d339163945109412619a7254d8460225a5cb35b4ee0a5bab
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. N. Othman\, Laboratory of Control and Chemical Engineering
 \, CNRS\, Lyon\, France. \nControlling polymerization processes is essenti
 al in order to ensure the process safety and product quality. These reacti
 ons are known to be exothermic\, rapid and sensitive to impurities and the
 y have nonlinear behavior with constraints on the inputs and the states.\n
 In solution or emulsion polymerization\, one of the main polymer propertie
 s to be controlled is the polymer molecular weight (MW). This property is 
 related to the final product viscosity and mechanical and thermal properti
 es.\nIn this presentation\, a multivariable control strategy is used to co
 ntrol the polymer MW in emulsion polymerization processes while maximizing
  the reaction rate. First of all\, an online estimate of the polymer MW is
  calculated by developing a cascade of two nonlinear observers. Note that 
 real measurements of the polymer MW can only be done off line with importa
 nt delay. Controlling the polymer MW is then done by using input-output li
 nearizing control that takes into account the process nonlinearity. The st
 rategy is validated in the case of styrene (St) emulsion polymerization fo
 r which the model is well known. The methodology is then validated for the
  monomer methyl methacrylate (MMA) where a simplified behavioral model is 
 identified.
LOCATION:ME C2405
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR