| 摘要 |
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 DEG to 140 DEG 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 DEG -180 DEG 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.
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