B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/349, 23/353,
B01D 53/34 (2006.01) B01D 53/50 (2006.01) B01D 53/56 (2006.01) B01D 53/60 (2006.01)
Patent
CA 1101192
ABSTRACT A cyclic process for removing lower valence nitrogen oxides from gaseous mixtures includes treating the mixtures with an aqueous media including sulfuric and/or nitric acid and a peroxygen substance to form nitric acid and other higher valence nitrogen oxides wherein the ratio of the peroxygen moiety to dinitrogen trioxide (N203) and nitrogen dioxide (N02) is greater than the stoichiometric amount and the treating tempera- ture is not more than about 100°C. Highly selective recovery of nitric acid and/or nitrates in high purity and yield may then follow. If present in such gaseous mixtures, sulfur dioxide is best removed first, as in a cyclic process including treating these mixtures with aqueous media including alkali metal carbonate/bicarbonate where the ratio of alkali metal to sulfur dioxide is not less than about 2. - 1 - The sulfur values may be recovered from the resulting carbonate/bicarbonate/sulfite-containing product aqueous media as alkali metal sulfate or sulfite salts which arc removed by crystallization from the carbonate-containing product aqueous media. Where the sulfur dioxide is not removed in this manner it may alternatively be recovered as sulfur dioxide, sulfuric acid, or as an alkali metal or alkaline earth metal sulfate. Where the gas mixture includes both sulfur dioxide and lower valence nitrogen oxides, the processes for removing and recovering lower valence nitrogen oxides and sulfur dioxide may be combined into a single removal/ recovery system, or may be advantageously effected in sequence.
284700
Borden Ladner Gervais Llp
Cooper Hal B.h.
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