论文部分内容阅读
均四甲苯是一种重要的有机化工原料,主要用于生产均苯四甲酸二酐,因而也是生产聚酰亚胺绝缘薄膜的最经济、最理想的原材料。聚酰亚胺在耐热性工程塑料中占有极为重要的位置,是目前热塑性工程塑料中耐热性最好的品种之一,广泛应用于航空、航天、机电及电子等领域。详细介绍了均四甲苯的性能和用途、生产方法、反应机理及分离提纯的方法。通过比较可知,四甲苯异构化制备均四甲苯的工艺,具有原料利用率高、经济效益好等优点,经济可行。
Are all four toluene is an important organic chemical raw materials, mainly for the production of pyromellitic dianhydride, which is also the production of polyimide insulating film the most economical and ideal raw materials. Polyimide occupies an extremely important position in heat-resistant engineering plastics and is one of the best heat-resistant varieties in thermoplastic engineering plastics currently. It is widely used in the fields of aviation, aerospace, electromechanical and electronics. The properties and uses, the production method, the reaction mechanism and the methods of separation and purification are all described in detail. By comparison, we can see that the isomerization of tetramethylbenzene isoniane process, with the advantages of high utilization of raw materials, good economic efficiency, economical and feasible.