大量的原料需要进行一个长期持续的过程，因此该单位的操作需要在一个连续的封闭循环中完成。来自塔顶部的馏出物和来自塔底部的残余物进入一个混合容器中，在那里它们再次被泵送入换热器，然后进入塔内（作为原料）。该单位允许在低于10kg/cm^2的压力下操作。
精馏塔英文参考文献和翻译(7):http://www.youerw.com/fanyi/lunwen_267.html
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