冷却混合物，结晶产物2，8-二氯-5-氟烟酸（III）以离心分离法得到并干燥。

The mixture was cooled and the crystalline product 2,8-dichloro-5-fluoronicotinic acid (III) was isolated by centrifugation and dried.

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气相氧化法是将空气与汽化后的均四甲苯混合进入含有催化剂的氧化反应器进行氧化反应，反应产物经换热冷却后，均苯四甲酸二酐直接从气相中凝华捕集。

In the method of air phase oxidation the mixed gas that boiling 1,2,4,5-tetramethyl benzene is combined with air is carried into oxidation reactor and reacts and then product gas is cooled.

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