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【单选题】
在常压精馏塔中分离某二元理想混合物。泡点进料，进料量为100kmol/h，进料组成为0.5（易挥发组分的摩尔分数，下同），馏出液流量为50kmol/h，组成为0.95，操作回流比为最小回流比的2倍，物系的平均相对挥发度为3。该情况下的精馏段操作线方程为（）。A.
y n+1 =0.615x n +0.365
B.
y n+1 =0.615x n -0.365
C.
y n+1 =0.385x n +0.365
D.
y n+1 =2.667x n +1.583
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举一反三
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A.
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B.
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C.
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D.
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A.
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D.
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