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    • 4. 发明公开
    • PROCEDE DE PREPARATION D'UN NITROPHENOL
    • 程序DE制备D'NITROPHENOL
    • EP1519911A1
    • 2005-04-06
    • EP03763942.4
    • 2003-07-09
    • RHODIA CHIMIE
    • FACHE, EricRIGHINI, Sébastien
    • C07C205/22
    • C07C201/16C07C205/22
    • The invention relates to a method of preparing a high-purity nitrophenol and, more specifically, p-nitrophenol from a nitrohalobenzene. The inventive method comprises the following steps: (a) hydrolysis of a nitrohalobenzene compound by reacting said compound with a base; (b) acidification in order to produce the nitrophenol compound from the salt thereof by means of an acid treatment; (c) crystallisation of the nitrophenol compound obtained; and (d) separation of the product obtained. The invention is characterised in that it also comprises at least the following steps: (e) concentration of the reaction medium after hydrolysis (a) and before acidification (b); and (f) liquid/liquid decantation after acidification (b) and before crystallisation (c), which is intended to eliminate the water phase obtained after acidification (b).
    • 本发明涉及由硝基卤代苯制备高纯度硝基苯酚,更具体而言,制备对硝基苯酚的方法。 本发明方法包括以下步骤:(a)通过使所述化合物与碱反应来水解硝基卤代苯化合物; (b)酸化以便通过酸处理由其盐产生硝基苯酚化合物; (c)所得硝基酚化合物的结晶; 和(d)分离所得产物。 本发明的特征在于其还包括至少以下步骤:(e)在水解(a)之后和酸化(b)之前浓缩反应介质; 和(f)酸化后(b)和结晶前(c)液体/液体倾析,其目的是消除酸化后得到的水相(b)。