Terminating Bromination of Styrenic Polymer in a Bromination Reaction Mixture
AssigneeAlbemarle Corporation
InventorsJohn F. Balhoff, Charles H. Kolich
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Abstract
A brominated styrenic polymer reaction mixture containing at least (i) brominated styrenic polymer, (ii) bromination reaction solvent, (iii) hydrogen bromide, and (iv) Lewis acid bromination catalyst, and an aqueous medium in an amount sufficient to deactivate the Lewis acid catalyst but insufficient to form a separate continuous liquid phase in the resultant mixture are mixed together to terminate bromination. The advantages of using such small amounts of aqueous medium, as well as various follow on procedures are described.
Claims15
A process which comprises mixing with a brominated styrenic polymer reaction mixture containing at least (i) brominated styrenic polymer, (ii) bromination reaction solvent, (iii) hydrogen bromide, and (iv) Lewis acid bromination catalyst, an amount of aqueous medium sufficient to deactivate the Lewis acid catalyst but insufficient to form a separate continuous liquid phase in the resultant mixture.
A process comprising (A) brominating styrenic polymer in an organic solvent in the presence of a Lewis acid bromination catalyst to form a reaction mixture having an organic liquid phase containing dissolved brominated styrenic polymer, and (B) treating said reaction mixture with an aqueous medium in an amount at least sufficient to deactivate the bromination catalyst but insufficient to form a separate continuous liquid phase in the resultant treated reaction mixture.
Dependencies are inferred from the claim text.