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Title: Processes to remove acid forming gases from exhaust gases

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.
Authors:
 [1]
  1. (El Cerrito, CA)
Publication Date:
OSTI Identifier:
869504
Report Number(s):
US 5348715
DOE Contract Number:
AC03-76SF00098
Resource Type:
Patent
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
Country of Publication:
United States
Language:
English
Subject:
processes; remove; acid; forming; gases; exhaust; gases; relates; process; reducing; concentration; gas; process; comprises; contacting; gas; sample; containing; gaseous; oxidizing; agent; oxidize; contacting; gas; sample; step; comprising; aqueous; reagent; bisulfite; sulfite; compound; selected; urea; sulfamic; acid; hydrazinium; hydrazoic; acid; nitroaniline; sulfanilamide; sulfanilic; acid; mercaptopropanoic; acid; mercaptosuccinic; acid; cysteine; combinations; degree; 100; degree; ph; 01; 60; optionally; contacting; reaction; product; step; conventional; chemical; reagents; reduce; concentrations; organic; products; reaction; step; environ-mentally; acceptable; levels; urea; sulfamic; acid; preferred; especially; sulfamic; acid; step; performed; sulfamic acid; sulfamic acid; sulfamic acid; acceptable levels; forming gas; gas sample; 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/