题目内容

流率为800 koml/h、组成为0.4的二元理想溶液精馏分离，要求塔顶产品组成达到0.7，塔底残液组成不超过0.1，泡点进料，回流比为2.5。要使塔顶采出量达到500 koml/h，应采取的措施是（）。

A. 增加进料量
B. 加大回流比
C. 改变进料热状况
D. 塔顶增加分凝器

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