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...

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Hauptverfasser: TAO MING, LIAO ZUTAI, ZHANG ZHEMING, LYU XUEHAO, FAN BIN, CHEN YULIANG
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LIAO ZUTAI
ZHANG ZHEMING
LYU XUEHAO
FAN BIN
CHEN YULIANG
description 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
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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. 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HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
title Method for purifying 2,3-dichloropyridine
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