Preparation of brominated styrenic polymers or resins

Details Preparation of brominated styrenic polymers or resins Preparation of brominated styrenic polymers or resins

C - Chemistry, Metallurgy

08

F

C08F 8/20 (2006.01)

Patent

CA 2629736

Bromination of styrenic polymer is carried out in a closed reaction system to retain BK coproduct (where HX is HBr or HC1, or both) in the bromination reaction mixture at superatmospheric pressure. Preferably, the reaction mixture which includes the brominated styrenic polymer and substantially all of the HX coproduct formed is discharged into an aqueous quenching medium. By operating in this manner, the reaction is terminated and the brominated styrenic polymer of desired bromine content and substantially all HX coproduct are captured in the same operation, process equipment costs are reduced, and processing of the reaction mixture is facilitated.

Bromation de polymère styrénique, effectuée dans un système de réaction fermé permettant de retenir un co-produit BK (sachant que HX est HBr ou HC1 ou les deux) dans le mélange de réaction de bromation sous pression superatmosphérique. De préférence, le mélange de réaction qui comprend le polymère styrénique bromé et sensiblement la totalité du co-produit HX formé est évacué dans un milieu d'absorption aqueux. Cette manière de procéder permet de mettre fin à la réaction et de capturer dans la même opération le polymère styrénique bromé à teneur en brome souhaitée et sensiblement la totalité du co-produit HX, de réduire les coûts d'équipement de traitement et de faciliter le traitement du mélange de réaction.

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