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Fig. 1 reported the details of methanol synthesis process. The relevant chemical reactions involved are: Main reformer reaction: C H 4 + 2 H 2

Fig. 1 reported the details of methanol synthesis process. The relevant chemical reactions involved are:
Main reformer reaction: CH4+2H2OCO2+4H2
(a)
Reformer side reaction: CH4+H2OCO+3H2
(b)
CO converter reaction: 2CO+O22CO2
(c)
Methanol synthesis reaction: CO2+3H2CH3OH+H2O
(d)
Based on the reaction (a),15% excess steam is fed to the reformer, and conversion of methane is 100%, with a yield of 90%CO2. Conversion of the methanol reactor is 50% on one pass through the reactor.
A stoichiometric quantity of O2 is fed to the CO converter, and the CO is completely converted to CO2. Additional makeup CO2 is then introduced to establish a 3 to 1 ratio of H2 to CO2 in the feed stream to the methanol reactor.
The methanol reactor effluent is cooled to condense all of the methanol and water, with the noncondensable gases recycled to the methanol reactor feed. The H2CO2 ratio in the recycle stream is also 3 to 1.
Because the methane feed contains 1% nitrogen as an impurity, a portion of the recycle stream must be purged to prevent the accumulation of nitrogen in the system. The purge stream analyses 5% nitrogen. On the basis of 100 moles of CH4 feed (including the N2) determine:
\table[[Compound,CH4,H2O,CO2,CO,CH3OH,H2,O2
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