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A mixture of air and methanol vapour is fed to a converter in which the following reactions take place:
CH OH O HCHO H O 3 2 2 2 1 + ® + 3 2 CH OH ® HCHO + H
In addition, some methanol is completely oxidised to CO2 and water. 25% of the methanol feed leaves the converter unreacted. After condensation of the unreacted methanol, formaldehyde (HCHO) and water vapour, the gas stream contains: 17% H2, 75% N2 and 3% O2 & 5% CO2 by moles.
Calculate a) the ratio of air to methanol in the feed
b) the yield of formaldehyde from methanol (moles HCHO/mole CH3OH feed)
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