Patent ID: 8680347

Claim:
A process for the preparation of a high assay decabromodiphenylalkane product which as produced has an occluded free bromine content of no more than 500 ppm, which process comprises brominating, in a liquid phase reaction mixture, at least one diphenylalkane in which the alkylene group contains in the range of 1 to about 10 carbon atoms, with bromine, in the presence of an aluminum, aluminum halide or a ferric halide catalyst in which the halogen atoms of such halides, as used in forming the charge thereof into said reaction mixture are chlorine atoms, bromine atoms, or both, wherein an excess of bromine is used in the process and wherein the maximum excess amount of bromine used in the process is about 20 mole % relative to the stoichiometric amount required to convert the diphenylalkane to the decabromodiphenylalkane product, wherein the temperature of the bromination reaction mixture is maintained in the range of about 45 to about 98° C. at least during the mixing of the bromine and the diphenylalkane, and whereby the high assay decabromodiphenylalkane product is prepared without use of procedures to reduce the occluded free bromine content.