Process for the preparation of 1-naphthylamine-4,6-disulphonic a

Details Process for the preparation of 1-naphthylamine-4,6-disulphonic a Process for the preparation of 1-naphthylamine-4,6-disulphonic a

1981-03-25

1982-07-06

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14360

Patent

active

043382614

ABSTRACT:
Improved process for the preparation of 1-naphthylamine-4,6-disulphonic acid wherein the sulphonation of the 1-naphthylamine-6-sulphonic acid is carried out by adding the oleum at a temperature of 10.degree. to 70.degree. C., either to initially introduce sulphuric acid simultaneously with the 1-naphthylamine-6-sulphonic acid or to 1-naphthylamine-6-sulphonic acid, which is dissolved or suspended in sulphuric acid, and by using such a molar ratio of sulphur trioxide to 1-naphthylamine-6-sulphonic acid that 1.2 to 3 mols of sulphur trioxide are present per mol of 1-naphthylamine-6-sulphonic acid. The sulphonation mixture formed in the preparation can be sulphonated in a second sulphonation stage to 1-naphthylamine-2,4,6-trisulphonic acid.

REFERENCES:
Beilstein, vol. XIV, p. 790, 1943.
Ullmann, Enzyklopadie der Tech. Chem., vol. 12, p. 628 (1960).

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