Unformatted text preview: ChE 501 Fall 2016 HW Assignment 9 Solution 1. A reaction process is designed to produce methanol Mfrom methane, CH4, and
oxygen, 02. The possible reactions include the following. CH4 +— %02 => CH30H  CH4 + 2202 3 C021 2H20 ~. 
CH30H + $02 :> C02 + 2H20  How many independent reactions are there? How many independent material balances?
The feed flow—rate is 200 mol/h, and the feed contains 200 % excess methane and no
methanol. Draw and label a ﬂow diagram and find the composition of the feed stream. If
all of the limiting reactant is consumed, and the selectivity of methanol with respect to carbon dioxide is 10.0, find the composition and flow rate of the product stream.
f There are two independent reactions and ﬁve independent material balances. n mol CH l h
n1; mol CH4I h n; mol 02711
nZF mol 02 I h React” n3 mol CH30H I h
m mol C02] h
n5 mol H20 l h The information given about the feed provides two equations. The total feed is the sum of
component feeds. n1F + n,F = 200 The excess methane is based on the amount fed and the amount required to consume all
of the oxygen. .. -1 MW—ZH .mols.CH .req
_ 2F 4 molsl O2 - fed
200%- excess— - 2. 00: IF = 6n2F
6n2F +n2F =200 n2F =27ﬂ=286 n”, =200—28.6=171 The feed stream is 14% oxygen and 86% methane. ...
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