公开(公告)号：US20080045756A1

公开(公告)日：2008-02-21

申请号：US11898745

申请日：2007-09-14

申请人： Erie Fache ,  Sebastien Righini

发明人： Erie Fache ,  Sebastien Righini

IPC分类号： C07C205/06

CPC分类号： C07C201/16 ,  C07C205/22

摘要： 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).

摘要翻译： 本发明涉及一种从硝基卤苯制备高纯度硝基苯酚，更具体地说是对硝基苯酚的方法。 本发明的方法包括以下步骤：（a）通过使所述化合物与碱反应来水解硝基卤苯化合物; （b）酸化以通过酸处理从其盐生产硝基苯酚化合物; （c）获得的硝基苯酚化合物的结晶; 和（d）所得产物的分离。 本发明的特征在于其还包括至少以下步骤：（e）水解（a）和酸化（b）之前浓缩反应介质; 和（f）在酸化（b）和结晶（c）之前的液体/液体倾析，其旨在消除酸化后获得的水相（b）。