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二元混合液用恒沸精馏方法进行分离, S 和 A 形成最低恒沸物从塔顶蒸出,用空气冷却器使它全部冷凝,部分作为回流,部分作为塔顶产品。设定空冷器的空气进出口温度分别为 35 °C 和 45 °C ,要求空冷器的有效温差为 10 °C 。 ( 1 )试估算塔的操作压力最小为多少? ( 2 )计算恒沸物的组成。
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