申请人:Ciba Specialty Chemicals Corporation
公开号:US06022970A1
公开(公告)日:2000-02-08
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.
一种改进的方法,用于从可选取代的2,5-二苯胺基对苯二甲酸制备可选取代的2-苯胺基蒽醌酮,包括以下步骤:(a)环化2,5-二苯胺基对苯二甲酸,得到一个中间产物混合物,其中包含主要部分的2-苯胺基-3-羧基蒽醌酮和少量的喹茶醌;(b)将该中间产物混合物与溶解2-苯胺基-3-羧基蒽醌酮的溶剂在高温下混合,但不溶解喹茶醌;(c)在步骤(b)中混合物中,以高温脱羧2-苯胺基-3-羧基蒽醌酮,得到一个固体喹茶醌和溶解在溶剂中的2-苯胺基蒽醌酮的产品浆料;(d)从溶剂中分离固体喹茶醌,催化剂和其他固体杂质,得到一个含有溶解的2-苯胺基蒽醌酮的溶液;(e)随后从溶剂中分离溶解的2-苯胺基蒽醌酮。该方法提供了高产量和纯度的2-苯胺基蒽醌酮。还描述了一种制备2-苯胺基蒽醌酮/喹茶醌高性能金黄色颜料的方法。