A process for the purification of an oxydiphthalic anhydride includes contacting a mixture of an oxydiphthalic anhydride and at least one of the corresponding oxydiphthalic diacid, a corresponding oxydiphthalic tetraacid, a halophthalic anhydride, and a catalyst with a solvent to provide a slurry. The solvent is capable of solubilizing the corresponding oxydiphthalic diacid, the corresponding oxydiphthalic tetraacid, the halophthalic anhydride, and the catalyst at a temperature of 15 to 50°C, and the oxydiphthalic anhydride is substantially insoluble in the solvent at this temperature. The oxydiphthalic anhydride can be isolated from the slurry. A purified oxydiphthalic anhydride and a polyetherimide prepared therefrom are also disclosed.
一种提纯
邻苯二甲酸酐的工艺包括将
邻苯二甲酸酐与相应的
邻苯二甲酸二元酸、相应的
邻苯二甲酸四元酸、卤代
邻苯二甲酸酐和催化剂中的至少一种的混合物与溶剂接触,以提供一种浆液。溶剂能够在 15 至 50°C 的温度下溶解相应的二
邻苯二甲酸二脂、相应的二
邻苯二甲酸四脂、卤代
邻苯二甲酸酐和催化剂,而二
邻苯二甲酸酐在此温度下基本上不溶于溶剂。氧
二苯酐可以从浆液中分离出来。此外,还公开了一种纯化的
邻苯二甲酸酐和由此制备的聚醚
酰亚胺。