Patent ID: 8889093

Claim:
A method for producing ammonia, comprising: methanating a gas comprising about 4 mol % to about 64 mol % nitrogen, about 35 mol % to about 95 mol % hydrogen, about 0.1 mol % to about 0.9 mol % carbon monoxide, and about 0.1 mol % to about 0.9 mol % carbon dioxide to produce a gas mixture comprising about 10 mol % to about 50 mol % nitrogen, about 55 mol % to about 75 mol % hydrogen, and about 0.5 mol % to about 10 mol % methane; introducing the gas mixture to a compressor to produce a compressed gas mixture having a pressure of about 1,000 kPa to about 20,800 kPa, wherein the compressed gas mixture has the same composition as the gas mixture entering the compressor; selectively separating the compressed gas mixture at cryogenic conditions to produce a first gas comprising about 10 mol % to about 40 mol % nitrogen and about 60 mol % to about 90 mol % hydrogen, and a second gas comprising about 5 mol % to about 30 mol % methane, about 1 mol % to about 10 mol % argon, residual hydrogen, and about 40 mol % to about 85 mol % nitrogen; and reacting at least a portion of the first gas at conditions sufficient to produce an ammonia product.