Compositions and methods for inhibiting vinyl aromatic...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 7/20 (2006.01) B01J 27/24 (2006.01) C07C 15/46 (2006.01) C07C 211/51 (2006.01) C07C 239/12 (2006.01)

Patent

CA 2672489

Compositions and methods for inhibiting polymerization of vinyl aromatic monomers in oxygen-free processing systems are disclosed. The compositions comprise an oxime compound and a hydroxylamine compound and, alternatively, an oxime compound or a dinitrophenol, a hydroxylamine compound and a phenylenediamine compound The methods comprise adding one of the compositions to the vinyl aromatic monomer in an amount ranging from 1 to about 10,000 parts per million parts monomer. An improved method for inhibiting the polymerization of vinyl aromatic monomers with a hydroxylamine compound is also disclosed. The improvement provides for adding a catalytic amount of a phenylenediamine compound to the vinyl aromatic monomer system while replacing any phenylenediamine compound lost as a result of physical removal from the system via the waste stream.

On présente des compositions et des méthodes permettant d'inhiber la polymérisation des monomères vinyliques aromatiques dans les systèmes de traitement exempts d'oxygène. Les compositions comprennent un composé d'oxime et un composé d'hydroxylamine et, subsidiairement, un composé d'oxime ou un dinitrophénol, un composé d'hydroxylamine et un composé de phénylènediamine. Ces procédés consistent à ajouter l'une des compositions au monomère vinylique aromatique en une quantité allant de 1 à environ 10.000 parties par million de monomère. On décrit également une méthode perfectionnée permettant d'inhiber la polymérisation des monomères vinyliques aromatiques à l'aide d'un composé d'hydroxylamine. Ce perfectionnement prévoit l'ajout d'une quantité catalytique d'un composé de phénylènediamine au système de monomère vinylique aromatique tout en remplaçant tout composé de phénylènediamine perdu au cours de l'évacuation physique du système via le courant de déchets.

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