二元理想溶液精馏时,在气液混合进料状态下,若F、xF、xD、xW不变,则随原料中液相分率增加,在相同回流比下,精馏段理论板数________。
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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
连续精馏操作时,若进料液汽比为1:4(摩尔)时,则进料热状况参数q为()。
A. 1
B. 0
C. 0.2
D. 0.25
He English for 3 years before he came here .
A. is still learning
B. had been learning
C. was still learning
D. has been learning
Han Mei told me she _____lunch, so she was very hungry.
A. has had
B. hasn't have
C. have had
D. hadn't had