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\t常压操作的精馏塔分离苯与甲苯的混合物，进料液含苯50%（摩尔分数，下同），进料量为40kmol/h，且为饱和液体进料；塔顶产品中含苯95%，塔底产品中含苯2%，塔顶采用，泡点回流，回流比为3.0，物系的平均相对挥发度为2.5。试求：\t（1）塔顶、塔底产品的流量及塔顶产品中苯的回收率；\t（2）精馏段与提留段内每块塔板上升蒸汽及下降液体的摩尔流量；\t（3）精馏段的操作线方程；\t（4）最小回流比。
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