lecture+19+intro+ammonia+synth

lecture+19+intro+ammonia+synth - Ammonia Synthesis: Design...

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Ammonia Synthesis : Design of a Plug Flow Reactor (PFR) (The Haber Process) ½ N 2 + 3/2H 2 NH 3 N 2 + 3 H 2 2NH 3 Chemical equation is commonly written in both ways. Be careful! Fritz Haber 1918 Nobel Laureate in Chemistry
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Ammonia Synthesis catalytic reactor 1 N 2 3 H 2 NH 3 N 2 H 2 Raw Materials (earth, fire, water, sky) Where do we get N 2 , H 2 in H 2 /N 2 = 3:1 ratio? Nitrogen: From air by burning out N 2 Hydrogen: Like in the hydrogen economy, we obtain H 2 from fossil fuel via steam reforming.
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Steam Reforming for H 2 (reverse of methanation) Δ H rxn / (Btu/lbmol) CH 4 + H 2 O CO + 3H 2 +97,300 Water Gas Shift (get more H 2 ) CO + H 2 O CO 2 + H 2 -14,800 Combustion to Burn out O 2 (to leave N 2 ) CH 4 + 2O 2 CO 2 +2H 2 O -383,100 direct from air N 2 goes along !! We burn out O 2 !! This also supplies heat for reforming. H 2 Source: from hydrocarbon and water N 2 Source: from air! NB: these rxns are also the source for the H 2 economy !
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Composition of Air Species Mol % N 2 78.054 O 2 20.948 Ar 0.934 Ne 0.001818 He 0.000524 Kr 0.000114 Xe 0.0000087 H 2 0.00005 other 0.0315 Thus, the air contains inerts, mainly argon. (can get argon
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lecture+19+intro+ammonia+synth - Ammonia Synthesis: Design...

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