Method for reducing and/or preventing production of...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 2/00 (2006.01) C08F 210/16 (2006.01) C07C 2/08 (2006.01)

Patent

CA 2670936

A method for controlling a transition from an initial polymerization reaction to a target polymerization reaction in a manner that reduces significantly the amount of off-grade product having excessively low density produced during the transition, including steps of: during the transition, maintaining a first one of a concentration ratio and a feed ratio at an at least substantially constant value while implementing process changes in an effort to bring produced polymer into compliance with a target specification set and monitoring (without controlling) the other one of the concentration ratio and the feed ratio to generate first data; and during the transition, determining from the first data whether polymer having excessively low density is likely to be produced during the transition, and upon determining that polymer having excessively low density is likely to be produced during the transition, maintaining during the remaining portion of the transition the other ratio at a value that is at least substantially constant while allowing the first ratio to vary is provided.

Cette invention se rapporte à un procédé permettant de contrôler une transition depuis une réaction de polymérisation initiale à une réaction de polymérisation cible. Ledit procédé est exécuté d'une manière qui réduit significativement la quantité de produit déclassé de densité excessivement faible fabriqué durant la transition, et comprend les étapes consistant à : pendant la transition, maintenir un premier rapport de concentration et un premier rapport d'alimentation à une valeur au moins sensiblement constante, tout en implémentant des variations de processus en vue d'amener le polymère produit en conformité avec un groupe de spécifications cibles, et surveiller (sans contrôler) l'autre rapport de concentration et l'autre rapport d'alimentation de manière à générer des données initiales ; et pendant la transition, déterminer à partir desdites données initiales si le polymère de densité excessivement faible est susceptible d'être produit durant la transition et, après avoir déterminé si ce polymère de densité excessivement faible est susceptible d'être produit durant la transition, maintenir pendant le reste de la transition l'autre rapport à une valeur qui est au moins sensiblement constante tout en permettant au premier rapport de varier.

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