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

1979-09-04

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14366

Patent

active

041668260

ABSTRACT:
A process has been invented for the preparation of a mono-alkali metal 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 in the presence of an alcohol and/or alcoholate and in the presence of a substance which contains at least one oxygen atom bonded to a nitrogen atom, at elevated pressure and elevated temperature, and separating out the mono-alkali metal salt of 1-amino-8-naphthol-3,6-disulphonic acid 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: 1573056 (1926-02-01), Gubelmann et al.
patent: 1670406 (1928-05-01), Gubelmann et al.
Fiat Final Report No. 1,016, pp. 32-39.

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