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Title: Processes to remove acid forming gases from exhaust gases

Abstract

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.

Inventors:
 [1]
  1. (El Cerrito, CA)
Issue Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
OSTI Identifier:
869504
Patent Number(s):
5348715
Assignee:
Regents of University of California (Oakland, CA) LBNL
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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/

Citation Formats

Chang, Shih-Ger. Processes to remove acid forming gases from exhaust gases. United States: N. p., 1994. Web.
Chang, Shih-Ger. Processes to remove acid forming gases from exhaust gases. United States.
Chang, Shih-Ger. Sat . "Processes to remove acid forming gases from exhaust gases". United States. https://www.osti.gov/servlets/purl/869504.
@article{osti_869504,
title = {Processes to remove acid forming gases from exhaust gases},
author = {Chang, Shih-Ger},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

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