Process for the preparation of 1-amine-2-naphthol-4-sulfonic aci

Details Process for the preparation of 1-amine-2-naphthol-4-sulfonic aci Process for the preparation of 1-amine-2-naphthol-4-sulfonic aci

1989-05-12

1990-05-29

Chan, Nicky

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfonic acids or salts thereof

C07C14366

Patent

active

049297520

ABSTRACT:
There is disclosed an improved semi-continuous and continuous process for the preparation of 1-amino-2-naphthol-4-sulfonic acid by nitrosation of 2-naphthol, addition of bisulfite, acidification with mineral acid and reduction of the reaction product so obtained, which comprises charging the reactor with the nitrosating agent and simultaneously adding 2-naphthol and mineral acid simultaneously in separate streams in the semi-continuous process, or charging the reactor with the reaction mass and simultaneously adding 2-naphthol, mineral acid and the nitrosating agent in separate streams in the continuous process. The product can be further used, without isolation, for the synthesis of dyes.

REFERENCES:
Nerad et al., C.A., 86-155,397j (1977).
Organic Synth. vol. I (1941) pp. 411-413.
Bios Final Report No. 986 Pt. 1, Item No. 22, pp. 44-45 & pp. 146-147.

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