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

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

1990-10-05

1991-11-26

Lone, Werren B.

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

Organic compounds

Oxygen containing

568722, 568728, 568730, C07C 3762, C07C 3916

Patent

active

050684639

ABSTRACT:
A process for the production of tetrabromo-4,4'-alkylidenediphenols, especially tetrabromobisphenol A (TBBA), from the corresponding alkylidenediphenols by oxidative bromination with Br.sub.2, HBr.sub.3 or HBr and aqueous hydrogen peroxide in the presence of an organic solvent. The process is characterized by washing the organic phase containing dissolved tetrabromo-4,4'-alkylidenediphenol with an aqeuous alkali sulphite solution, preferably at 50.degree. to 90.degree. C. Through this washing treatment, the tetrabromo compound is obtained in higher purity; in addition, the mother liquor can be recycled without difficulty.

REFERENCES:
patent: 3929907 (1975-12-01), Janzon et al.

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