Process for making decabromodiphenyl oxide.

摘要

The process comprises: (a) initiating a feed of molten diphenyl oxide to a substantially anhydrous mixture of methylene dibromide solvent, elemental bromine (Br2) and an aluminum trihalide catalyst at a temperature between 10 and 30 DEG C; (b) heating the reaction mixture to 50-60 DEG C and while maintaining the temperature at 50-60 DEG C, continuing the feed of molten diphenyl oxide until the total amount fed is equivalent to (i) 0.064 to 0.077 mole per mole of elemental bromine (Br2) employed in the reaction and (ii) 0.2 to 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.