化工原理上下册试题答案

Y1?0.05?0.0526Y2?Y1?1????0.0526?0.1?0.00526

1?0.05V1X2?0X1??Y1?Y2????0.0526?0.00526??0.01578

L3*(2)Y1?1.5?0.01578?0.02367Y2*?0

NOG?Y1?Y20.0526?0.00526??3.41 0.0526?0.02367?0.00526?Ym0.0526?0.02367ln0.00526V47.5??0.9455 m 2KYa?100?0.785?0.8HOG?Z?HOGNOG?0.9455?3.41?3.224 m

三、有苯和甲苯混合物,含苯0.4,流量1000 kmol/h,在一常压精馏塔内进行分离,要求塔顶馏出

液中含苯0.9(以上均为摩尔分率),苯的回收率不低于90%,泡点进料,泡点回流,取回流比为最小回流比的1.5倍,已知相对挥发度??= 2.5。试求 (1)塔顶产品量D;塔底残液量W及组成xW; (2)回流比R及精馏段操作线方程;

(3)由第二块理论板(从上往下数)上升蒸汽的组成。 解:(1)

0.9D?9000?0.4D?400kmol/hxW?W?600kmol/h

1000?0.4?400?0.9?600xW(2)q?11000?0.4?400?0.9?0.0667

600y?zqx?Fq?1q?1 q线方程: x?0.4

平衡线方程:??2.5y??x1????1?x

y?2.5x

1?1.5x联立求得:xd?0.4 Rmin?yd?0.625xD?yd0.9?0.625??1.222yd?xd0.625?0.4R?1.5Rmin?1.8333

精馏段操作线:

y?xRx?D?0.647x?0.317R?1R?12.5x11?1.5x1

(3)y1?xD?0.9 由平衡线方程可得:0.9?x1?0.7826

5

由精馏段操作线:

y2?0.647x1?0.317?0.8234

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