C - Chemistry – Metallurgy – 01 – C
Patent
C - Chemistry, Metallurgy
01
C
183/1, 23/220
C01C 1/04 (2006.01)
Patent
CA 1107479
ABSTRACT OF THE DISCLOSURE Ammonia synthesis processes are disclosed which provide enhanced conversion of hydrogen values to ammonia. In the processes, a purge stream from an ammonia synthesis loop is treated to reduce its ammonia content to less than about 0.5 volume percent. The purge stream is then contracted at an ele- vated pressure, preferably, at least substantially the super- atmospheric synthesis pressure of the ammonia synthesis, with the feed side of a separation membrane which exhibits selec- tive permeation of hydrogen as compared to the permeation of each of methane and argon. A total pressure a driving force for hydrogen permeation through the membrane. A hydrogen- rich permeating gas is obtained on the permeate exit side of the membrane. The permeating gas is combined with gas passing to the ammonia synthesis reaction zone for conversion to ammonia. For instance, the permeation gas can be com- bined with synthesis loop. A non-permeating gas is removed from the feed side of the separation membrane at substantially the same pressure at which the purge stream is contacted with the separation membrane and provides a valuable source of energy due to its high pressure and combustible gas content.
323748
Mcfadden Fincham
Monsanto Company
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