Process for the isolation of 1-naphthylamine-4,6- and 1-naphthyl

Details Process for the isolation of 1-naphthylamine-4,6- and 1-naphthyl Process for the isolation of 1-naphthylamine-4,6- and 1-naphthyl

1981-03-25

1982-09-07

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14360

Patent

active

043483364

ABSTRACT:
Process for the isolation of 1-naphthylamine-4,6- or 1-naphthylamine-4,7-disulphonic acid from sulphonation mixtures obtained in the sulphonation of 1-naphthylamine-6- or 1-naphthylamine-7-sulphonic acid with sulphuric acid and sulphur trioxide, wherein the aqueous solutions or suspensions formed, when the sulphonation mixtures are introduced into water, are warmed to 80.degree. to 120.degree. C., optionally kept for a period of time at this temperature, are then cooled to temperatures below 70.degree. C., and the 1-naphthylamine-4,6- or 1-naphthylamine-4,7-disulphonic acid which has crystallized out is finally filtered off.

REFERENCES:
patent: 3979445 (1976-09-01), Ross et al.
patent: 4199529 (1980-04-01), Bonath et al.

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