C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
48/25, 319/4
C01B 3/00 (2006.01) C01B 3/02 (2006.01) C10J 1/00 (2006.01) H01M 8/06 (2006.01)
Patent
CA 1071870
ABSTRACT OF THE DISCLOSURE A solid fuel, preferably crude lignite, is comminuted to a particle size of less than 6 millimeters and then gasified togeth- er with the inherent water content thereof at temperatures of up to 1150°C. The crude gas thus obtained is washed and simultaneous- ly cooled to temperatures below the water dew point. Subsequently, the crude gas is desulfurized. According to one embodiment of the invention, the crude gas is next subjected to a carbon dioxide scrub. The thus-purified gas is then subjected to low-temperature dissoci- ation and a hydrogen-rich gaseous fraction is recovered. A portion of the hydrogen-rich fraction is combusted in the presence of such a quantity of air that the nitrogen present is sufficient to con- stitute the required proportion of nitrogen in the final ammonia synthesis gas. The combustion products are cooled to condense the water vapor and the resulting nitrogen-rich gas is then combined with the remainder of the hydrogen-rich fraction to produce a gas which is suitable for the synthesis of ammonia. According to an- other embodiment of the invention, a first portion of the desulfur- ized crude gas is subjected to the carbon dioxide scrub and the low-temperature dissociation described above so as to yield a hydrogen-rich gaseous fraction. A second portion of the desulfur- ized gas is combusted in the presence of such a quantity of air that the nitrogen present is sufficient to constitute the required proportion of nitrogen in the final ammonia synthesis gas. The combustion products are then cooled as above and the resulting nitrogen-rich gas is combined with the hydrogen-rich fraction de- rived from the first portion of the crude gas to produce a gas which is suitable for the synthesis of ammonia. - 1 -
253958
Franke Friedrich H.
Pattas Ernst
Staege Hermann
Krupp-Koppers G.m.b.h.
Rheinische Braunkohlenwerke Ag
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