Methanol is synthesized from carbon monoxide and hydrogen in a catalytic reactor. The fresh feed to the process contains 32.0 mole % CO, 64.0% H2, and 4.0% N2. This stream is mixed with a recycle stream in a ratio of mol recycle/mol fresh feed to produce the feed to the reactor, which contains 13.0 mole % N2. A low single-pass conversion is attained in the reactor. The reactor effluent goes to a condenser from which two streams emerge: a liquid product stream containing all the methanol formed in the reactor, and a gas stream containing all the CO, H2, and N2 leaving the reactor. The gas stream is split into two fractions: one is purged from the process, and the other is the recycle stream that combines with the fresh feed to the reactor. For a methanol production rate of 100 kmol/hr, calculate the molar flow rate and composition of the purge gas, and the overall and single-pass CO conversion. Explain why we include recycling and purging streams in these processes.
Fresh Feed stream:
(mol/h)
CO: 32.0
H2: 64.0
N2: 4.0
Product stream:
(mol/h)
Methanol: ?
Condenser:
(mol/h)
CO: ?
H2: ?
N2: ?
Purge:
(mol/h)
CO: ?
H2: ?
N2: ?