Patent ID: 9227926
Filing Date: 2016-01-05
CPC Classification: C07C

Claim Text:
1. A process for synthesizing an azo compound, comprising the successive steps of: a) reacting hydrogen peroxide with an aqueous solution of a hydrazo compound containing at least one organic or inorganic acid, at least one alkali metal bromide or hydrogen bromide, and at least one water-soluble compound selected from the group consisting of salts and acids based on a catalytic metal chosen from molybdenum and tungsten, so as to form a solution containing an azo compound; b) adding the solution obtained in step (a) to at least one reducing agent selected from the group consisting of hydrazine, sodium sulfite, sodium bisulfite, or mixtures thereof to obtain a reaction mixture; c) recovering all or part of the reaction mixture, wherein the part of the reaction mixture not recovered may be optionally recycled into step (a), to obtain a recovered reaction mixture; d) separating the recovered reaction mixture into a fraction containing the azo compound and a mother liquor fraction; and e) optionally, washing the fraction containing the azo compound to isolate the azo compound.