对苯撑二（4-氨基苯并恶唑）合成工艺的正交试验

用对苯二甲酸、2,4-二氨基苯酚盐酸盐为原料合成了对苯撑二（4-氨基苯并恶唑）。采用正交试验方法讨论了原料配比、反应时间、反应温度和催化剂的用量对产品收率的影响,并得出了优选反应工艺条件为：物料配比为n（2,4-二氨基苯酚盐酸盐）：n（对苯二甲酸）=2.1;反应时间为7h;反应温度为210℃;n（多聚磷酸）：n（对苯二甲酸）=1.5,在此条件下产品的收率可以达到87%以上,经精制后产品的纯度可以达到99.4以上。

The Orthogonal Test of Synthesizing Poly p(4-Amino Benzoxazole)

The poly p（4-amino benzoxazole） was synthesized with using terephthalic acid and 2,4-diaminophenol chloride as raw materials.The effects of molar ratio of reactants,reaction time and temperature and catalyst dosage on the yield were investigated by orthogonal experiments.The optimum conditions for reaction were obtained as follows： n（2,4-diaminophenol chloride）：n（terephthalic acid）=2.1,the reaction time was 7h,the reaction temperature was 210℃,n（polyphosphoric acid）：n（terephthalic acid）=1.5.And the yield of poly p（4-amino benzoxazole） reached over 87%.The purity of product was above 99.4%.