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测定馏程时为什么要严格控制加热速度？

发表时间：2018-10-25 16:58

　　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。

　　在一定容積的蒸餾瓶中，氣體的壓力隨氣體物質的量增多而增高，隨氣體物質的量的減少而降低。在蒸餾操作中，如因蒸餾瓶受熱過大，加熱速度過快，讀出的蒸餾溫度往往要比正常蒸餾溫度偏高。**還會出現過熱現象，使幹點提高而不易測准。若整個測定過程加熱速度過于慢，以至加熱強度不足，則各餾出溫度均顯著降低。因此，嚴格控制加熱速度是測定餾出操作中最重要的一項，否則會影響測定結果的精密度。

上一篇潤滑脂機械雜質的幾種測定方法

下一篇電廠用抗燃油自燃點測定方法

文章分類：技術知識

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