Process for the production of 2-amino-1-naphthalenesulfonic acid
    2.
    发明授权
    Process for the production of 2-amino-1-naphthalenesulfonic acid 失效
    2-氨基-1-萘磺酸的制备方法

    公开(公告)号:US4510100A

    公开(公告)日:1985-04-09

    申请号:US559149

    申请日:1983-12-07

    CPC分类号: C07C309/00

    摘要: The invention relates to an improved process for the production of 2-amino-1-naphthalenesulfonic acid (Tobias acid). This improved process makes it possible to obtain Tobias acid which has only a very low content of 2-aminonaphthalene and in high space-time yield. The process starts from 2-hydroxynaphthalene and comprises the following main reaction steps:(a) the sulfonation of 2-hydroxynaphthalene to 2-hydroxynaphthalene-1-sulfonic acid (oxy-Tobias acid) with chlorosulfonic acid, in an inert organic solvent;(b) the neutralization of the liberated hydrochloric acid and excess chlorosulfonic acid still present in the reaction medium and conversion of the 2-hydroxynaphthalene-1-sulfonic acid obtained into the corresponding ammonium salt with ammonia;(c) conversion of the 2-hydroxy group into the 2-amino group by the Bucherer reaction; and(d) the subsequent precipitation of the Tobias acid with dilute sulfuric acid.

    摘要翻译: 本发明涉及一种生产2-氨基-1-萘磺酸(托比亚酸)的改进方法。 这种改进的方法使得可以获得仅具有非常低的2-氨基萘含量和高空时收率的托比亚酸。 该方法从2-羟基萘开始,包括以下主要反应步骤:(a)在惰性有机溶剂中用氯磺酸将2-羟基萘磺化为2-羟基萘-1-磺酸(氧 - 托比酸); (b)中和反应介质中仍然存在的游离的盐酸和过量的氯磺酸,并将得到的2-羟基萘-1-磺酸转化为相应的铵盐与氨; (c)通过Bucherer反应将2-羟基转化为2-氨基; 和(d)随后用稀硫酸沉淀托比亚酸。