Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1998-06-02
1999-11-16
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
42324301, 42324308, 423395, 423551, 423555, 423DIG2, 134 41, B01D 5360, C23G 102
Patent
active
059852232
ABSTRACT:
A process for the removal of a high percentage of NOx and SOx from the gaseous effluent of a metal pickling operation comprising passing the effluent through an aqueous scrubber, treating the gaseous effluent from the scrubber with ozone, passing the effluent from the ozone treatment through a second aqueous scrubber thereby removing at least 80 vol % of the NOx and SOx present in the original effluent. The scrubbing solutions in both of the scrubbers preferably have a pH of from 7 to 14, more preferably 10 to 14. The scrubbing solutions in both scrubbers are caustic solutions containing sodium hydroxide or calcium hydroxide. The NOx and SOx in the scrubbers are converted into nitrate salts and sulfate salts, which are removed from the scrubbers.
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Anderson Mark H.
Hwang Shuen-Cheng
Saxena Neeraj
Workosky Robert Francis
Pace Salvatore P.
Straub Gary P.
The BOC Group Inc.
Vanoy Timothy C
Von Neida Philip H.
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