B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/111, 23/354,
B01D 53/34 (2006.01) B01D 53/36 (1985.01)
Patent
CA 1261591
- 16 - ABSTRACT A PROCESS FOR THE REMOVAL OF NITROGEN OXIDES AND SULPHUR OXIDES FROM FLUE GASES The invention relates to a process for eliminating nitrogen oxides and sulphur oxides from a stream of flue gas containing nitrogen oxides and sulphur oxides comprising the steps of (a) adding ammonia to the stream of flue gas and con- tacting the resulting stream, at a temperature of 250-450°C, with a reduction catalyst for selective reduction of nitrogen oxides into nitrogen and water, the molar ratio of ammonia to nitrogen oxides being in the range of 0.6-1.8, (b) contacting the stream from step (a), at a tempera- ture of 300-470°C, with an oxidation catalyst for oxidation of unreacted ammonia into nitrogen and water and simultaneous oxidation of sulphur dioxide into sulphur trioxide, and (c) cooling the stream from step (b) for condensation of sulphur trioxide in the form of sulphuric acid. Hereby the products of the process of the invention are steam, nitrogen, and concentrated sulphuric acid of com- mercial quality giving no waste disposal problems.
522048
Goudreau Gage Dubuc
Haldor Topsýe A/s
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