Process for making decabromodiphenyl oxide

Details Process for making decabromodiphenyl oxide Process for making decabromodiphenyl oxide

1987-07-15

1988-10-18

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568631, C07C 43192

Patent

active

047789336

ABSTRACT:
The process comprises: (a) initiating a feed of molten diphenyl oxide to a substantially anhydrous mixture of methylene dibromide solvent, elemental bromine (Br.sub.2) and an aluminum trihalide catalyst at a temperature between about 10.degree. and about 30.degree. C.; (b) heating the reaction mixture to about 50.degree.-60.degree. C., and while maintaining the temperature at about 50.degree.-60.degree. C., continuing the feed of molten diphenyl oxide until the total amount fed is equivalent to (i) about 0.064 to about 0.077 mole per mole of elemental bromine (Br.sub.2) employed in the reaction, and (ii) about 0.2 to about 10 parts by weight per part by weight of methylene dibromide employed in the reaction; (c) steam distilling the methylene dibromide solvent and the residual bromine from the reaction mixture; (d) recovering decabromodiphenyl oxide from the distilland; and (e) drying the methylene dibromide and bromine distillate to render them suitable for reuse in the process.

REFERENCES:
patent: 3763248 (1973-10-01), Mitchell
patent: 3965197 (1976-06-01), Stepniczka
patent: 4287373 (1981-09-01), Garman et al.
patent: 4521633 (1985-06-01), Pedjac

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