Process for the production of amino-I-acid

Details Process for the production of amino-I-acid Process for the production of amino-I-acid

1978-09-29

1980-04-22

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C13900, C07C14360

Patent

active

041995295

ABSTRACT:
A process for the production of amino-I-acid (2-naphthylamino-5,7-disulfonic acid) starting from Tobias acid (2-naphthylamine-1-sulfonic acid), which comprises sulfonating Tobias acid with fuming sulfuric acid (oleum) isothermically at room temperature, further sulfonating the resulting 2-naphthylamine-1,5-disulfonic acid without isolation, by rapidly heating the reaction mixture to 110.degree. to 140.degree. C. to give 2-naphthylamine-1,5,7-trisulfonic acid, hydrolyzing the trisulfonic acid in sulfuric acid having a concentration between 80 and 98%, at a temperature of 100.degree.-180.degree. C., to give the amino-I-acid, precipitating this latter from dilute sulfuric acid and isolating it from the reaction mixture, and the amino-I-acid obtained by this process.

REFERENCES:
patent: 1969189 (1934-08-01), Tinker et al.
patent: 3979445 (1976-09-01), Ross
Honben/Weyl-"Meth. der Org. Chem", Band IX, pp. 444-446, 474-485, 536-537 (1955).

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