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

1978-06-28

1979-12-11

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14366

Patent

active

041783085

ABSTRACT:
A process has been invented for the preparation of a mono-alkali metal salt of 1-amino-8-naphthol-3,6-disulphonic acid comprising reacting 1-naphthylamine-3,6,8-trisulphonic acid and/or a salt thereof and/or a naphthylamine-trisulphonic acid isomer mixture and/or salt thereof with an alkali metal hydroxide solution at elevated pressure and elevated temperature and in the presence of an alcohol or alcoholate, and separating out the mono-alkali metal salt by acidification. The process results in the procurement of higher yields of the desired product and in the formation of less by-products.

REFERENCES:
patent: 458286 (1891-08-01), Kuzel
patent: 511708 (1893-12-01), Moeller
patent: 540412 (1895-06-01), Ulrich et al.
patent: 1670406 (1928-05-01), Gubelmann et al.
patent: 4130581 (1978-12-01), Ross

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