间歇减压精馏分离2-甲基吡啶/2-羟乙基吡啶

采用间歇减压精馏法实现了2-甲基吡啶和2-羟乙基吡啶这一热敏性混合物的分离，并考察了投料组成与操作压力对减压精馏过程的影响。结果表明，高真空条件降低了塔釜温度从而避免了物料在塔釜中受热变性，对于热敏物料2-羟乙基吡啶，减压精馏过程中压力应控制在4325 Pa以下，此时塔釜产品2-羟乙基吡啶的质量分数均能大于97%，同时收率能保持在86%以上。在压力为1325 Pa时，不同投料组成下塔顶产品2-甲基吡啶的质量分数和塔釜产品2-羟乙基吡啶的质量分数均高于98%，两者的收率也均在85%以上，能够很好地满足工业生产要求。

Separation of 2-picoline/2-ethanolpyridine by batch vacuum distillation

2-Picoline and heat-sensitive material 2-ethanolpyridine were separated by batch vacuum distillation. The effects of feed composition and operating pressure on vacuum distillation process were also investigated. The results showed that high vacuum in the column lowering the bottom temperature ensured the feed in the reboiler against the thermal degeneration. The optimal pressure was below 4325 Pa for 2-ethanolpyridine in vacuum distillation process. The mass fraction of 2-ethanolpyridine in the reboiler could be more than 97% and the yield of 2-ethanolpyridine could be over 86% under this condition. When the pressure was 1325 Pa the mass fraction of 2-picoline in the distillate and 2-ethanolpyridine in the reboiler were both up to 98%，with yields above 85%，meeting the requirements of industrial production well.