B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/349, 23/353
B01D 53/14 (2006.01) B01D 53/34 (2006.01) B01D 53/60 (2006.01)
Patent
CA 2001223
ABSTRACT Exhaust gases are treated to remove NO or NOX and SO2 by contacting the gases with an aqueous emulsion or suspension of yellow phosphorus preferably in a wet scrubber. The pressure is not critical, and ambient pressures are used. Hot water temperatures are best, but economics suggest about 50°C are attractive. The amount of yellow phosphorus used will vary with the composition of the exhaust gas, less than 3% for small concentrations of NO, and 10% or higher for concentrations above say 1000 ppm. Similarly, the pH will vary with the composition being treated, and it is adjusted with a suitable alkali. For mixtures of NOX and SO2, alkalis that are used for flue gas desulfurization are preferred. With this process, 100% of the by-products created are usable, and close to 100% of the NO or NO and SO2 can be removed in an economic fashion.
Chang Shih-Ger
Liu David K.
Smart & Biggar
The Regents Of The University Of California
LandOfFree
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