Preparation method of 2, 3-dipicolinic acid

The invention provides a preparation method of 2, 3-dipicolinic acid. The preparation method comprises the following steps: mixing quinoline, inorganic acid and water in a reaction device to obtain a mixed solution, arranging an aeration device on the wall surface of the reaction device, introducing ozone into the mixed solution through the aeration device, and carrying out an ozone oxidation reaction to obtain an ozone intermediate reaction solution; adding an oxidizing agent into the ozone intermediate reaction liquid to carry out oxidation reaction to obtain 2, 3-dipicolinic acid; a quinoline-inorganic acid-water reaction system is adopted, and an aeration device is arranged on the wall surface of the reaction device, so that the gas-liquid mass transfer efficiency is increased, the reaction rate is favorably increased, and the safety of the reaction system is improved. 本发明提供了一种2,3-吡啶二羧酸的制备方法。该制备方法包括：将喹啉、无机酸和水在反应装置中混合，得到混合溶液，喹啉的通式为#imgabs0#在反应装置壁面上设置曝气装置，通过曝气装置向混合溶液中通入臭氧进行臭氧氧化反应，得到臭氧中间体反应液；向臭氧中间体反应液中加入氧化剂，