Process for the preparation of 1-amino-8-naphthol-3,6-disulphoni

Details Process for the preparation of 1-amino-8-naphthol-3,6-disulphoni Process for the preparation of 1-amino-8-naphthol-3,6-disulphoni

1980-09-12

1982-04-20

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14366

Patent

active

043258891

ABSTRACT:
The invention relates to a process for the preparation of 1-amino-8-naphthol-3,6-disulphonic acid (H-acid) as the mono-alkali metal salt from napthylamine-trisulphonic acid isomer mixtures by alkaline hydrolysis under pressure. The separation of the H-acid is effected by utilizing an aqueous sulphuric acid which contains naphthalene- and/or nitronaphthalene- and/or naphthylamine- and/or naphthol- and/or aminonaphthol-mono-, -di-and/or-tri-sulphonic acids.

REFERENCES:
patent: 4111979 (1978-09-01), Kotera et al.
patent: 4166826 (1979-09-01), Schossler et al.
patent: 4178308 (1979-12-01), Schossler et al.

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