Processes to remove acid forming gases from exhaust gases
- El Cerrito, CA
The present invention relates to a process for reducing the concentration of NO in a gas, which process comprises: (A) contacting a gas sample containing NO with a gaseous oxidizing agent to oxidize the NO to NO.sub.2 ; (B) contacting the gas sample of step (A) comprising NO.sub.2 with an aqueous reagent of bisulfite/sulfite and a compound selected from urea, sulfamic acid, hydrazinium ion, hydrazoic acid, nitroaniline, sulfanilamide, sulfanilic acid, mercaptopropanoic acid, mercaptosuccinic acid, cysteine or combinations thereof at between about 0.degree. and 100.degree. C. at a pH of between about 1 and 7 for between about 0.01 and 60 sec; and (C) optionally contacting the reaction product of step (A) with conventional chemical reagents to reduce the concentrations of the organic products of the reaction in step (B) to environ-mentally acceptable levels. Urea or sulfamic acid are preferred, especially sulfamic acid, and step (C) is not necessary or performed.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
- DOE Contract Number:
- AC03-76SF00098
- Assignee:
- Regents of University of California (Oakland, CA)
- Patent Number(s):
- US 5348715
- OSTI ID:
- 869504
- Country of Publication:
- United States
- Language:
- English
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01
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60
acceptable
acceptable level
acceptable levels
acid
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acid forming
agent
anoic acid
aqueous
bisulfite
chemical
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chemical reagents
combinations
compound
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concentration
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environ-mentally
especially
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reagent
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sulfanilamide
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urea