化工热力学答案

T min 0 100 200 300 400 CA mol/l 1000 500 333 250 200

For CA0 = 500mol/m3 find the conversion of reactant after 5 hours in the batch reactor Answer :CA-1 10-3 2*10-3 3*10-3 4*10-3 5*10-3 二级。 1/ CA = 1/ CA0+ kt 斜率 k = (5-2)* 10-2/300 = 10-5m3/mol min 1/ CA = 2*10-3+10-5*5*6= 5*10-3 ∴ CA = 0.2*103 = 200mol/m3.

xA = CA0 - CA /CA0 = 500 – 200 /500 = 60%.

10. Find the first order rate constant for the disappearance of A in the gas reaction on holding the pressure constant ,the volume of the reaction ,starting with 80%A, decreases by 20% in 3min .

answer :2A → R 惰性物 nt

0.8 0 0.2 1 0 0.2 0.2 0.6 ε

A = (0.6-1)/1 = -0.4

V = V0 (1+εAxA) = V0 (1-0.4xA)

V/ V0 – 1 = V?V0V0 = -0.4 xA = -0.2

xA = 0.5 ㏑11?xA = kt

㏑11?0.5= ㏑2 = 3k k = 1/3㏑2 min-1

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