Process for preparing aromatic diazonium salts by diazotation of

Details Process for preparing aromatic diazonium salts by diazotation of Process for preparing aromatic diazonium salts by diazotation of

1986-03-07

1988-06-28

Higel, Floyd D.

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

Organic compounds

Azo

534560, 534561, 534565, 534582, 534583, 534632, 534638, 534775, 534829, 534887, C09B 2900, C09B 29033, C09B 6224, C09B 6744

Patent

active

047540206

ABSTRACT:
A new method of diazotization consists in using as the diazotizing agent in an aqueous, aqueous organic or organic medium the system comprising salt of nitrous acid+acid insoluble in the reaction medium, in particular organic or inorganic cation exchangers having acid groups. The diazonium salt solutions thus prepared are immediately reacted with coupling components to give azo dyestuffs, the insoluble acid and/or its salt being separated off before or after the coupling.

REFERENCES:
patent: 2319265 (1943-05-01), Rossander et al.
patent: 2812321 (1957-11-01), Eberhart et al.
patent: 2845326 (1958-07-01), Streck
patent: 3423391 (1969-01-01), Kindler et al.
patent: 4378970 (1983-04-01), Lienhard et al.

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