论文部分内容阅读
二十五、苯酐 邻苯二甲酸酐,俗称苯酐;为白色针状晶体,密度1.527g/cm~3,熔点130.8℃,沸点284.5℃,易升华;稍溶于冷水,易溶于热水并水解为邻苯二甲酸,能溶于乙醇、苯和吡啶,微溶于乙醚。苯酐应用很广,可用于制造染料、药物、聚酯树脂、醇酸树脂、塑料、增塑剂和涤纶等。 1 工艺技术 目前,世界苯酐生产所采用的工艺路线有萘流化床氧化、萘或邻二甲苯固定床氧化。其中以邻二甲苯固定床氧化技术为主,大约占世界苯酐总生产能力的80％以上;
Twenty-five, phthalic anhydride phthalic anhydride, commonly known as phthalic anhydride; white needle crystals, density 1.527g/cm~3, melting point 130.8 °C, boiling point 284.5 °C, easy sublimation; slightly soluble in cold water, soluble in hot water and Hydrolysis to phthalic acid, soluble in ethanol, benzene and pyridine, slightly soluble in ether. Phthalic anhydride is widely used and can be used to make dyes, drugs, polyester resins, alkyd resins, plastics, plasticizers and polyesters. 1 Process Technology At present, the process routes used in the production of phthalic anhydride in the world include fluidized bed oxidation of naphthalene, fixed bed oxidation of naphthalene or o-xylene. Among them, o-xylene fixed bed oxidation technology is dominant, accounting for more than 80% of the total production capacity of phthalic anhydride in the world;