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La fracción superior de
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La
顶部回流主要是取走顶部热量，所以会影响塔顶温度；塔内从下到上气相负荷是越来越低的，也就是气体量越来越少所以压力越来越低
La fracción实质上是多段热蒸发塔，通过控制不同的温度来实现不同沸点物质的蒸发与冷凝，其手段是用冷回流的办法，取走蒸发塔内的热量。
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