Recovery of antimony catalyst residues from bromination...

Details Recovery of antimony catalyst residues from bromination... Recovery of antimony catalyst residues from bromination...

2006-01-31

2006-01-31

Choi, Ling-Sui (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S326100, C525S326400, C528S499000, C528S50200C

Reexamination Certificate

active

06992148

ABSTRACT:
A process for brominating a styrenic polymer in an organic solvent in the presence of an antimony trihalide catalyst such that a reaction mass containing brominated styrenic polymer in an organic phase is formed is improved by mixing hydrochloric acid or hydrobromic acid, or both, with said reaction mass at least once to extract antimony catalyst residues from said reaction mass as an acidic aqueous phase. Preferably, catalyst residues are recovered from the acidic aqueous phase and still more preferably, recovered antimony trihalide catalyst residues are recycled to constitute at least a portion of the antimony trihalide catalyst used in preparing the brominated styrenic polymer.

REFERENCES:
patent: 4352909 (1982-10-01), Barda et al.
patent: 5723549 (1998-03-01), Dever et al.
patent: 0201411 (1986-11-01), None
patent: 1 531 799 (1978-11-01), None
patent: WO 96/31578 (1996-10-01), None

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