PRODUCTION METHOD FOR HIGH-QUALITY ADIPIC ACID

The present invention produces high-quality adipic acid by using a mixed liquid, containing materials such as nitric acid, adipic acid, glutaric acid and succinic acid, obtained by a nitric acid oxidation method through triple purification and separation, two-stage activated carbon absorption, and third-stage impurity filtering process. The present invention is characterized in: performing first purification and separation on the mixed liquid containing the adipic acid, dissolving, adding efficient activated carbon for first-stage activated carbon absorption and first-stage activated carbon filtering, performing second purification and separation, dissolving, performing second-stage activated carbon absorption and second-stage activated carbon filtering, setting a three-stage superfine filter to remove impurities before the third purification and separation, performing the third purification and separation to obtain adipic acid filter cakes, and drying the adipic acid filter cakes to obtain the high-quality adipic acid. The high-quality adipic acid produced by the production method is high in purity, few in impurities and widely applicable to high-end products.