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US 5,852,132 AGranted
Process for brominating polystyrenic resins
AssigneeAlbemarle Corporation
InventorsBillie B. Dadgar, Donald E. Balhoff, 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 forming a reaction mass by feeding a mixture, (i) which is substantially free of a bromination catalyst and (ii) which is formed from at least brominating agent and a styrenic polymer, to a catalytic quantity of a bromination catalyst.
Claims29
A process for the bromination of polystyrene, which process comprises:
- a. feeding a mixture of a brominating agent and a solution of polystyrene to a reactor containing a bromination catalyst and associated liquid, in which
- i. the mixture is 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.
2 more elements
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 a mixture to the external mixer, in which
- i. the mixture or individual streams, as the case may be, 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
A process for the bromination of polystyrene, which process comprises:
- a. providing a bromination catalyst and associated liquid in a reactor;
- and
- b. feeding a brominating agent and a solution of polystyrene to a mixing nozzle which is within the reactor interior, in which
- i. the brominating agent and the polystyrene solution fed to the mixing nozzle 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.
4 more elements
Dependencies are inferred from the claim text.