Process for pollution control
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United States of America Patent
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Feb 6, 1996
Grant Date -
N/A
app pub date -
Oct 13, 1992
filing date -
Oct 13, 1992
priority date (Note) -
Expired
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Abstract
Improved processes and improved compositions reduce the environmental damage caused by large-scale combustion, especially in the field of NO.sub.x reduction by selective noncatalytic reduction (SNCR) in the gas phase. In one aspect, the process improves the reliability of known means, compositions and methods for reducing the concentration of pollutants in a gas stream by: preparing an aqueous solution comprising a pollutant-reducing agent and a surface active agent in ratio of surface active agent to pollutant-reducing agent of greater than 1:4000, the amount and composition of surface active agent being effective to reduce average droplet size by at least 10%, and introducing the solution into the gas stream. Preferred surface active agents have HLB values of from about 8 to about 20, and are preferably anionic or nonionic agents such as C.sub.11 -C.sub.15 secondary alcohol ethoxylates, C.sub.12 -C.sub.15 linear primary alcohol ethoxylates, alkylated diphenyl oxide disulfonates and nonyl phenol ethoxylated ethanol.
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