Post-treatment method for preparing naphthol AS-PH

The invention belongs to the technical field of chemical engineering, and particularly relates to a post-treatment method for preparing naphthol AS-PH, which comprises the following steps: removing asolvent from a reaction solution after synthesizing naphthol AS-PH, cooling, sequentially stirring and washing with absolute ethyl alcohol, leaching, and drying to obtain refined naphthol AS-PH. According to the invention, traditional treatment methods such as alkali dissolution acidification and the like are abandoned; treatment process is simple, operability is strong, according to the post-treatment method, the technical problems of low product purity, high content of alkali insoluble substances, recycling of a catalyst and the like caused by recycling of naphthol AS-PH mother liquor in a traditional process are solved; the purity of the product can reach 99.5% or above, the content of alkali-insoluble substances is smaller than 0.08%, the content of the alkali-insoluble substances is greatly reduced, the color