1. It is desired to produce 120 kmol/hr acetaldehyde (CH3CHO) from the reaction of ethanol (C2H5OH) and oxygen as shown below. There is a second, undesirable reaction that also takes place to form acetic acid (CH3COOH).
C2H5OH + ½ O2 = CH3CHO + H2O
CH3CHO + ½ O2 = CH3COOH
The reactions take place in a continuous reactor at 250oC and 1.5 atm absolute pressure, with a feed to the reactor consisting of ethanol and air at 120oC and 1.5 atm absolute with an ethanol:O2 molar ratio of 5.71:1. For these process conditions, the ethanol conversion in the continuous reactor is 25% and the selectivity to acetaldehyde is 0.6 mol CH3CHO produced/mol C2H5OH reacted. Use the data below in your calculations.
a) Determine the outlet flow rate (kmol/hr) of every species exiting the reactor.
b) To maintain the reactor outlet temperature at 250oC and the pressure at 1.5 atm absolute, how much heat must be added or removed from the reactor?
Species
Cp (J/mol/oC)
ÎHf,o (kJ/mol)
O2 (g)
29.3
0
N2 (g)
28.9
0
C2H5OH (g)
65.5
-234.95
CH3CHO (g)
54.7
-166.2
CH3COOH (g)
66.5
-432.8
H2O (g)
33.6
-241.83
CO2 (g)
45.5
-393.50
1. It is desired to produce 120 kmol/hr acetaldehyde (CH3CHO) from the reaction of ethanol (C2H5OH) and oxygen as shown below. There is a second, undesirable reaction that also takes place to form acetic acid (CH3COOH).
C2H5OH + ½ O2 = CH3CHO + H2O
CH3CHO + ½ O2 = CH3COOH
The reactions take place in a continuous reactor at 250oC and 1.5 atm absolute pressure, with a feed to the reactor consisting of ethanol and air at 120oC and 1.5 atm absolute with an ethanol:O2 molar ratio of 5.71:1. For these process conditions, the ethanol conversion in the continuous reactor is 25% and the selectivity to acetaldehyde is 0.6 mol CH3CHO produced/mol C2H5OH reacted. Use the data below in your calculations.
a) Determine the outlet flow rate (kmol/hr) of every species exiting the reactor.
b) To maintain the reactor outlet temperature at 250oC and the pressure at 1.5 atm absolute, how much heat must be added or removed from the reactor?
| Species | Cp (J/mol/oC) | ÎHf,o (kJ/mol) |
| O2 (g) | 29.3 | 0 |
| N2 (g) | 28.9 | 0 |
| C2H5OH (g) | 65.5 | -234.95 |
| CH3CHO (g) | 54.7 | -166.2 |
| CH3COOH (g) | 66.5 | -432.8 |
| H2O (g) | 33.6 | -241.83 |
| CO2 (g) | 45.5 | -393.50 |
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