Example 40 Figure E12.6 illustrates a steady-state process for the production of methanol. All of the compositions are in mole fractions or percent. The stream flows are in moles. Over Syslem Boundary Feed F32.5 CO 02 0 Recycle R y 00 CH Separator OH,OH 100% CO+ 2H₂ →CH,OH Figure E12.6 Note in Figure E12.6 that some CH, enters the process, but does not participate in the reaction. A purge stream is used to maintain the CH, concentration in the exit from the separator at no more than 3.2 mol %, and prevent hydrogen buildup as well. The once-through conversion of the CO in the reactor is 18%. Compute the moles of recycle, CH OH, and purge per mole of feed, and also compute the purge gas composition.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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Example 40
Figure E12.6 illustrates a steady-state process for the production of methanol. All of the compositions are in mole
fractions or percent. The stream flows are in moles.
Over Syslem Boundary
Feed 32.5 CO
02 0
Reactor
Recycle R
y 00
CH,00
100%
CO+2H₂ →CH,OH
Figure E12.6
Note in Figure E12.6 that some CH, enters the process, but does not participate in the reaction. A purge stream is used
to maintain the CH, concentration in the exit from the separator at no more than 3.2 mol %, and prevent hydrogen
buildup as well. The once-through conversion of the CO in the reactor is 18%.
Compute the moles of recycle, CH,OH, and purge per mole of feed, and also compute the purge gas composition.
Transcribed Image Text:Example 40 Figure E12.6 illustrates a steady-state process for the production of methanol. All of the compositions are in mole fractions or percent. The stream flows are in moles. Over Syslem Boundary Feed 32.5 CO 02 0 Reactor Recycle R y 00 CH,00 100% CO+2H₂ →CH,OH Figure E12.6 Note in Figure E12.6 that some CH, enters the process, but does not participate in the reaction. A purge stream is used to maintain the CH, concentration in the exit from the separator at no more than 3.2 mol %, and prevent hydrogen buildup as well. The once-through conversion of the CO in the reactor is 18%. Compute the moles of recycle, CH,OH, and purge per mole of feed, and also compute the purge gas composition.
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