Ethylene oxide is produced by the catalytic oxidation of ethylene: 2 C2H4 + O2 −→ 2 C2H4O2 An undesired competing reaction is the combustion of ethylene: C2H4 + 3 O2 −→ 2 CO2 + 2 H2O The feed to the reactor (not the fresh feed to the process) contains 3 moles of ethylene per mole of oxygen. The single-pass conversion of ethylene is 20%, and for every 100 moles of ethylene consumed in the reactor, 90 moles of ethylene oxide emerges in the reactor products. A multiple-unit process is used to separate the products: ethylene and oxygen are recycled to the reactor, ethylene oxide is sold as a product, and carbon dioxide and water are discarded (a) Assume a quantity of the reactor feed stream as a basis of calculation, draw and label the flowchart, perform a degree-of-freedom analysis, and write the equations you would use to calculate i. the molar flow rates of ethylene and oxygen in the fresh feed ii. the production rate of ethylene oxide, and iii. the overall conversion of ethylene. Do no calculations. (b) Calculate the quantities specified in part (a), either manually or with an equation-solving program. (c) Calculate the molar flow rates of ethylene and oxygen in the fresh feed needed to produce 1 ton per hour of ethylene oxide.
Ethylene oxide is produced by the catalytic oxidation of ethylene:
2 C2H4 + O2 −→ 2 C2H4O2
An undesired competing reaction is the combustion of ethylene:
C2H4 + 3 O2 −→ 2 CO2 + 2 H2O
The feed to the reactor (not the fresh feed to the process) contains 3 moles
of ethylene per mole of oxygen. The single-pass conversion of ethylene is
20%, and for every 100 moles of ethylene consumed in the reactor, 90 moles of ethylene oxide emerges in the reactor products. A multiple-unit process is used to separate the products: ethylene and oxygen are recycled to the reactor, ethylene oxide is sold as a product, and carbon dioxide and water are discarded
(a) Assume a quantity of the reactor feed stream as a basis of calculation,
draw and label the flowchart, perform a degree-of-freedom analysis,
and write the equations you would use to calculate
i. the molar flow rates of ethylene and oxygen in the fresh feed
ii. the production rate of ethylene oxide, and
iii. the overall conversion of ethylene.
Do no calculations.
(b) Calculate the quantities specified in part (a), either manually or with an
equation-solving program.
(c) Calculate the molar flow rates of ethylene and oxygen in the fresh feed
needed to produce 1 ton per hour of ethylene oxide.
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If oxygen was fed into the process from an air stream, explain what changes would be required to the overall process and why.
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