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測定餾程時爲什麽要嚴格控制加熱速度

发表时间：2019-01-23 11:05

　　測定餾程要嚴格控制加熱速度，因爲石油産品餾程的測定時條件試驗。根據蒸餾油品餾分輕重不同，所規定的加熱速度也不同。規定從開始加熱到初餾點的時間，車用汽油、航空汽油、噴氣燃料爲5-10min，輕柴油爲5-15min；重油爲5-20min；初餾點到5%回收體積的時間車用汽油、航空汽油爲60-75s；此後，蒸餾速度還要保持每分鍾餾出4-5ml。

? ? ?在一定容积的蒸馏瓶中，气体的压力随气体物质的量增多而增高，随气体物质的量的减少而降低。在蒸馏操作中，如因蒸馏瓶受热过大，加热速度过快，读出的蒸馏温度往往要比正常蒸馏温度偏高。zui后还会出现过热现象，使干点提高而不易测准。若整个测定过程加热速度过于慢，以至加热强度不足，则各馏出温度均显著降低。因此，严格控制加热速度是测定馏出操作中zui重要的一项，否则会影响测定结果的精密度。

上一篇爲什麽蒸餾不同石油産品時要選用不同孔徑的石棉墊

下一篇車輛齒輪油的選用

文章分類：技術知識

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