申请人:Ciba Specialty Chemicals Holding Inc.
公开号:EP0877021A1
公开(公告)日:1998-11-11
An improved process for the preparation of optionally substituted 2-anilinoacridones from optionally substituted 2,5-dianilinoterephthalic acids, comprises:
(a) cyclizing 2,5-dianilinoterephthalic acid to give an intermediate product mixture which contains a major portion of a 2-anilino-3-carboxyacridone and a minor portion of a quinacridone;
(b) combining said intermediate product mixture with a solvent which dissolves the 2-anilino-3-carboxyacridone at elevated temperatures but does not dissolve the quinacridone;
(c) decarboxylating the 2-anilino-3-carboxyacridone in the mixture from step (b) at elevated temperatures to yield a product slurry comprising a solid quinacridone and a 2-anilinoacridone dissolved in the solvent;
(d) separating the solid quinacridone, the catalyst, and other solid impurities from the solvent, whereby a solution containing the dissolved 2-anilinoacridone is obtained; and
(e) subsequently separating the dissolved 2-anilinoacridone from the solvent.
This process provides 2-anilinoacridone in high yield and purity.
A process for the preparation of 2-anilinoacridone/quinacridonequinone high performance golden yellow pigments is also described.
一种由任选取代的 2,5-二苯胺对苯二甲酸制备任选取代的 2-苯胺吖啶酮的改进工艺,包括
(a) 环化 2,5-二苯胺对苯二甲酸,得到中间产物混合物,该混合物主要含有 2-苯胺-3-羧基吖啶酮,次要含有喹吖啶酮;
(b) 将所述中间产物混合物与一种溶剂混合,该溶剂在高温下可溶解 2-苯胺基-3-羧基吖啶酮,但不溶解喹吖啶酮;
(c) 将步骤(b)的混合物中的 2-苯胺基-3-羧基吖啶酮在高温下脱羧,得到由固体 喹吖啶酮和溶解在溶剂中的 2-苯胺基吖啶酮组成的产品浆液;
(d) 从溶剂中分离出固体喹吖啶酮、催化剂和其他固体杂质,从而得到含有溶解的 2-苯胺吖啶酮的溶液;以及
(e) 随后从溶剂中分离出溶解的 2-苯胺吖啶酮。
该工艺可提供高产率和高纯度的 2-苯胺吖啶酮。
此外,还介绍了一种制备 2-苯胺吖啶酮/喹吖啶酮醌高性能金黄色颜料的工艺。