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首頁 > 技術與支持 > 精餾的必要條件是什么

精餾的必要條件是什么

點擊次數:1673 發布時間:2014-05-19
利用液態或氣態混合物中各組份揮發性或沸點不同,來分離這些組份的方法叫精餾。精餾必要條件:(1)氣液相必須充分接觸,精餾塔內裝有多層塔板就是提供氣液充分接觸的條件;(2)氣液兩相接觸時,上升的高溫氣相中輕組份的濃度要高于平衡時的濃度,而下降的低溫液相中輕組份的濃度要低于平衡時的濃度。由于氣液兩相不平衡,并存在溫度差才能發生傳熱和傳質過程,起到精餾作用。
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