PREPARATION OF HIGH ASSAY DECABROMODIPHENYL OXIDE

摘要

A process is described for producing a reaction-derived decabromodiphenyl oxide product of high purity. In a continuous bromination process, partially brominated diphenyl oxide and coproduct hydrogen bromide are formed by bringing together elemental bromine and diphenyl oxide continuously in a first reaction zone. The partially brominated diphenyl oxide formed has an average of about 2-6 bromine atoms per molecule. The vapor phase and the partially brominated diphenyl oxide are removed continuously from the first reaction zone as separate entities. Then, or after storage, partially brominated diphenyl oxide is fed to a second reaction zone. This zone contains a refluxing reaction mixture comprising (i) an excess of bromine and (ii) a catalytic quantity of Lewis acid bromination catalyst. As the reaction in this zone is taking place, hydrogen bromide coproduct is removed therefrom in a sufficient amount to form a reaction-derived decabromodiphenyl oxide product of high purity.