Process for the preparation of tetrabromo-4,4'-...

Details Process for the preparation of tetrabromo-4,4'-... Process for the preparation of tetrabromo-4,4'-...

C - Chemistry, Metallurgy

07

C

260/616.8

C07C 37/62 (2006.01) C07C 37/70 (2006.01) C07C 39/367 (2006.01)

Patent

CA 2028187

Process for the preparation of tetrabromo-4,4'-alkylidonediphenols Abstract The invention is directed to the production of tetrabromo- 4,4'-alkylidenediphenols, especially tetrabromobisphenol A (TBBA), from the corresponding alkylidenediphenols by oxidative bromination with Br2, HBr3 or HBr and aqueous hydrogen peroxide in presence of an organic solvent and is characterized by a washing treatment, preferably at 50 to 90 °C, of the organic phase containing dissolved tetrabromo- 4,4'-alkylidenediphenol with an aqueous alkali sulphite solution. Through this washing treatment the tetrabromo compound is obtained in higher purity: simultaneously the mother liquor can be recycled without difficulty.

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