Method for purifying 2,3-dichloropyridine

The invention discloses a method for purifying 2,3-dichloropyridine. The method comprises the following steps: 1) placing crude 2,3-dichloropyridine into a reaction kettle, adding acid, then heating for reacting at 60 to 100 DEG C for 0.2-1 hour under the stirring condition, and separating obtained reaction liquid in a hot state to obtain an oil phase and a water phase; 2) adding alkali into the water phase obtained in the step 1) to regulate the pH to 8 to 12, then heating to boiling, performing steam distillation, collecting fractions of 100 to 103 DEG C, filtering the fractions, and dryinga filter cake to obtain 2,3-dichloropyridine. The method has the advantages of simple operation steps, high recovery rate of 2,3-dichloropyridine, high purity (purity of greater than or equal to 99.5percent by weight) and lower purification cost. 本发明公开了种提纯2,3-二氯吡啶的方法，包括以下步骤：1)、将2,3-二氯吡啶粗品置于反应釜中，加入酸，然后搅拌条件下于60～100℃加热反应0.2～1h，所得的反应液趁热分液，得到油相和水相；2)、取步骤1)得到的水相，先加入碱调节至pH为8～12；然后加热至沸腾，进行水蒸气蒸馏，收集100～103℃的馏分，对馏分过滤，将滤饼干燥，得2,3-二氯吡啶