Question

The off-gases from a gasoline stabilizer are fed to a steam reforming plant to produce hydrogen.
The composition of the off-gas, molar%, is: CH4 77.5, C2H6 9.5, C3H8 8.5, C4H10 4.5.
The gases entering the reformer are at a pressure of 2 bara and 35 °C and the feed rate is
2000 m3/h.
The reactions in the reformer are
1: C2H2n +2 + nðH2OÞ→nðCOÞ+ð2n +1ÞH2
2:CO +H2O→CO2 +H2
The molar conversion of C2H2n+2 in reaction (1) is 96% and of CO in reaction (2) is 92%.
Calculate
a. the average molecular mass of the off-gas,
b. the mass of gas fed to the reformer, kg/h,
c. the mass of hydrogen produced, kg/h.