Steam reforming is an important technology for converting re?ned natural gas, which we take here to be methane, into a synthesis gas that can be used to produce a variety of other chemical compounds. For example, consider a reformer to which natural gas and steam are fed in a ratio of 3.5 moles of steam per mole of methane. The reformer operates at 18 atm, and the reaction products leave the reformer in chemical equilibrium at 875°C. The steam reforming reaction is
and the water-gas shift reaction also occurs in the reformer.
(2)
The equilibrium constants for these two reactions are given by the expressions
At 875°C, KR= 872.9 atm2and KWG, = 0.2482. The process is to produce 100.0 kmol/h of hydrogen. Calculate the feed rates (kmol/h) of methane and steam and the volumetric ?ow rate (m3/min) of gas leaving the reformer.
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