HANOI UNIVERSITY OF MINING AND GEOLOGY
ADVANCED PROGRAM IN CHEMICAL ENGINEERING
ADECH 03- SOL MID 2
Duong Van Dai K4-10/2017
Problem 1 : The analysis of the bottom product of a distillation tower is shown in table 1 below. The bottom pressure of the tower is 1980 kPa. Calculate the reboiler temperature for the distillation system
Table 1 : Composition of the bottom product
Component
C3
i-C4
n-C4
n-C5
n-C6

Mole percent
0.50
20.25
25.25
45.50
8.50


Problem 2 : An absorber containing 5.5 theoretical plates uses a lean oil with a relative density of 0.82 flowing at the rate of 2500 m3/d. The molecular weight of the lean oil is 160. The tower pressure is 600kPa and the average temperature for calculation is 28°C. The gas flowrate is 1.5×10^6 m3/d. The analysis of the entering rich gas is shown in table 2 below. Estimate the recovery of each component.
Table 2 : Composition of the entering rich gas at the bottom of the absorber
Component
C1
C2
C3
i-C4
n-C4
i-C5
n-C5


𝑌
𝑁+1

0.88
0.06
0.035
0.003
0.009
0.005
0.008


𝑌
𝑁+1 is moles of any component in entering rich gas per mol of entering rich gas.