申请人:Amoco Corporation
公开号:US05183933A1
公开(公告)日:1993-02-02
Provided is a continuous process for producing 2,6-naphthalenedicarboxylic acid by the liquid phase oxidation of 2,6-dimethylnaphthalene comprising continuously adding to a reaction zone the oxidation reaction components comprising 2,6-dimethylnaphthalene, a source of molecular oxygen, a solvent comprising an aliphatic monocarboxylic acid, and a catalyst comprising cobalt, manganese and bromine components, wherein the atom ratio of manganese to cobalt is about 5:1 to about 0.3:1, the total of cobalt and manganese is at least about 0.40 weight percent based on the weight of solvent, and maintaining the contents of the reaction zone at a temperature of about 370.degree. F. to about 420.degree. F. and at a pressure sufficient to maintain at least a portion of the monocarboxylic acid in the liquid phase thereby oxidizing the 2,6-dimethylnaphthalene to 2,6-naphthalenedicarboxylic acid. By operating according to the process of this invention, 2,6-naphthalenedicarboxylic acid can be continuously produced in high yield and with low levels of impurities.
提供的是一种通过液相氧化2,6-二甲基萘生产2,6-萘二甲酸的连续过程,包括连续向反应区添加氧化反应组分,其中包括2,6-二甲基萘、分子氧源、溶剂(包括脂肪族一元羧酸)和催化剂(包括钴、锰和溴成分),其中锰与钴的原子比为约5:1至约0.3:1,钴和锰的总重量至少为溶剂重量的约0.40%,并将反应区的内容保持在约370°F至约420°F的温度和足以保持至少部分一元羧酸处于液相的压力下,从而将2,6-二甲基萘氧化为2,6-萘二甲酸。通过按照本发明的方法操作,可以高产地连续生产2,6-萘二甲酸,并且杂质水平较低。