Inferred water analysis in polyphenylene sulfide production

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 75/02 (2006.01)

Patent

CA 2598283

A method for producing polyphenylene sulfide (PPS) polymer, including polymerizing reactants in a reaction mixture in a vessel to form PPS polymer in the vessel, measuring values of operating variables of the vessel and/or PPS process, and determining the amount of quench fluid to add to the vessel based on the values of the operating variables. The technique may rely on the vapor liquid equilibrium (VLE) of the mixture to calculate the concentration of water existing in the reactor prior to quench, and accounts for the effectiveness of the upstream dehydration process and in the amount of water produced during the polymerization. The technique is a striking improvement over the trial-and-error estimation of the amount of quench water based on human operating experience, and avoids direct measurements of the existing water concentration in the reactor. The result is improved control of PPS particle size and other properties.

L~invention concerne un procédé de fabrication de polymère de sulfure de polyphénylène (PSP), englobant la polymérisation de réactifs dans un mélange de réaction dans un récipient pour constituer un polymère PSP dans le récipient, la mesure des valeurs de variables d~exploitation du récipient et/ou du processus PSP, et la détermination de la quantité de fluide de trempe à ajouter au récipient sur la base des valeurs des variables d~exploitation. La technique peut reposer sur l~équilibre liquide/vapeur (ELV) du mélange afin de calculer la concentration d~eau existant dans le réacteur avant la trempe, et intervient dans l~efficacité du processus de déshydratation en amont et dans la quantité d~eau produite pendant la polymérisation. La technique constitue une nette amélioration par rapport à l~estimation empirique de la quantité d~eau de trempe sur la base des connaissances pratiques humaines, et évite des mesures directes de la concentration d~eau existant dans le réacteur. Le résultat est un contrôle amélioré de la taille particulaire et d~autres propriétés du PSP.

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