C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
183/18, 23/316,
C01B 3/52 (2006.01) B01D 53/04 (2006.01) C01B 3/56 (2006.01)
Patent
CA 1146872
B 31100 Abstract Purifi¢ation of hydrogen A moist hydrogen stream is dried by cooling to below the dewpoint of water and separating water, drying further over a regenerable solid absorbent, separating a part stream of dried gas and using it to regenerate water-loaded absorbent, and re- cycling the resulting moist regeneration gas stream into the moist hydrogen stream upstream of the water separation step. If the starting moist hydrogen stream is produced by shift, CO2- removal and methanation the recycled gas is preferably introduced between CO2 removal and methanation. If it is produced from unreacted methanol synthesis gas the recycled gas is preferably introduced upstream of methanol synthesis. A moist hydrogen stream in which carbon oxides have been made innocuous by methanation over catalyst 18 is cooled to below dewpoint at 20 and depleted of water in separator 22. It is dried in one of driers 28 and compressed at 32. From compressor 32 a part stream is taken at 35, heated at 40 and passed through a further, water-loaded drier 28 to regenerate its charge. The re- sulting moist gas is recyoled to the inlet of methanation catalyst 18.
366979
Imperial Chemical Industries Limited
Roussin Bernard F.
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