Process for preparing Acid Red 151

Details Process for preparing Acid Red 151 Process for preparing Acid Red 151

1979-01-18

1981-02-03

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260144, 260208, C09B 2910, D06P 106, D06P 316, D06P 324

Patent

active

042487773

ABSTRACT:
A process for preparing a non-gelling Acid Red 151 is provided. In the diazotization of aminoazobenzene monosulfonic acid in an aqueous mineral acid and the coupling of the diazotized amine with 2-naphthol in an aqueous alkaline solution, the mineral acid and alkali are chosen such that, in addition to forming the salt of the sulfonic acid group of the dye, disodium hydrogen phosphate salts are formed and left in solution in the final coupling mass.

REFERENCES:
patent: 224928 (1880-02-01), Kohler
patent: 256375 (1882-04-01), Rumpff
patent: 2803625 (1957-08-01), Putter
patent: 3957425 (1976-05-01), Tullio
Houben-Weyl, "Methoden der Organischen Chemie," vol. X/3, pp. 22 and 23, (1965).
The Merck Index, Eighth Edition, p. 964, (1968).

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