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Methanol ( C H 3 O H ) is produced by the reaction of carbon dioxide ( C O 2 ) and hydrogen ( H
Methanol is produced by the reaction of carbon dioxide and hydrogen The feed to the reactor is made up of by volume and by volume where a fractional conversion of the hydrogen of is achieved. The product gas consisting of methanol and water, and unreacted hydrogen and carbon dioxide is passed to a condenser which separates the products of the reaction from the unreacted gases.
a Write down a balanced stoichiometric equation for the above reaction.
b Prepare a neat process flow diagram and fill in all of the knownunknown flow rates and compositions.
c Conduct a DegreeofFreedom analysis on the reactor, condenser and overall process and show that it is necessary to specify one other process variable to allow you to balance the PFD
d Assuming a basis of feed to the reactor determine the flow rates and compositions of all streams in the process.
e Express the composition of the exit gas stream from the reactor in mass fractions.
f The single pass mode of operation is very wasteful of the feed
gases. If the exit gas from the condenser is recycled and mixed with a fresh feed stream such that the reactor feed stream remains unchanged, determine the molar flow rate and composition of the fresh feed to the process.
g What modification to the process described in f would be required if the input stream contained by volume of an inert gas.
h If it is required to design a process to produce kmo of methanol what quantity of fresh feed gas would be required.
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