Method for preparing dimethyl 2, 6-naphthalate

The invention provides a method for preparing dimethyl 2, 6-naphthalate, which adopts 2, 6-dimethylnaphthalene, acetic acid, absolute methanol, a composite catalyst 1, a catalyst 2 and the like, and the dimethyl 2, 6-naphthalate is prepared by oxidation, esterification reaction and crystallization process. According to the method, a solid oxidation intermediate product is esterified step by step by using absolute methanol, so that the oxidation difficulty of a second methyl group is reduced, side reactions are reduced, and the conversion rate is high. And the solid oxidation intermediate product is more easily dissolved in methanol, and methyl esterification can be realized at a lower temperature. By adopting the method disclosed by the invention, the raw materials and the process cost are saved, the production efficiency is improved, and finally the preparation of the dimethyl 2, 6-naphthalate product with low cost, high yield and high purity is realized. 本发明提供了一种制备2,6-萘二甲酸二甲酯的方法，该制备方法是采用2,6-二甲基萘、乙酸、无水甲醇、复合催