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US 5,852,131 AGranted
Process for brominating polystyrenic resins
AssigneeAlbemarle Corporation
InventorsDonald E. Balhoff, Billie B. Dadgar, Charles H. Kolich, Meng-Sheng Ao, Homer C. Lin
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Abstract
This invention features a process for brominating styrenic polymers which process comprises feeding a first stream comprising a brominating agent, a second stream comprising styrenic polymer and a third stream comprising bromination catalyst to a mixer to intimately mix such streams.
Claims12
A process for the bromination of polystyrene, which process comprises:
- a. providing a bromination catalyst and associated liquid in a reactor and feeding a portion of the bromination catalyst and associated liquid to a mixer external of the reactor;
- b. feeding a brominating agent and a solution of polystyrene as separate streams to the external mixer, in which:
- i. the separate streams, prior to being fed to the external mixer, are substantially free of a bromination catalyst;
- ii. the solvent used in forming the polystyrene solution and the liquid associated with the catalyst contains less than 200 ppm water between the two of them;
- and
- iii. the brominating agent contains less than about 100 ppm water.
3 more elements
Dependencies are inferred from the claim text.