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【单选题】
有一相对挥发度为 2.00 的理想二组分溶液在连续精馏塔中进行精馏,已知塔内上升蒸汽量为 90.0 kmol h -1 , 塔顶采出量为 30.0 kmol h -1 ,塔顶采出液中轻组分含量为 0.950 (摩尔分数)。若塔顶使用冷凝器,则从塔顶起第二块理论塔板上回流液相的组成是
A.
0.420
B.
0.562
C.
0.852
D.
0.754
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