Processes to remove acid forming gases from exhaust gases

Patent · Sat Jan 01 00:00:00 EST 1994

OSTI ID:869504

Chang, Shih-Ger ^[1]

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1. 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 (United States)
• 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

Related Subjects

processes
remove
acid
forming
gases
exhaust
relates
process
reducing
concentration
gas
comprises
contacting
sample
containing
gaseous
oxidizing
agent
oxidize
step
comprising
aqueous
reagent
bisulfite
sulfite
compound
selected
urea
sulfamic
hydrazinium
hydrazoic
nitroaniline
sulfanilamide
sulfanilic
mercaptopropanoic
mercaptosuccinic
cysteine
combinations
degree
100
ph
01
60
optionally
reaction
product
conventional
chemical
reagents
reduce
concentrations
organic
products
environ-mentally
acceptable
levels
preferred
especially
performed
sulfamic acid
acceptable levels
forming gas
gas sample
succinic acid
compound selected
sample containing
exhaust gases
reaction product
process comprises
exhaust gas
oxidizing agent
remove acid
acid forming
acid form
chemical reagent
chemical reagents
organic product
organic products
gaseous oxidizing
conventional chemical
forming gases
anoic acid
oxidizing agen
acceptable level
/423/