英語翻譯
Removal of NO,and SO2 from Flue Gas by Peracid Solutions
小標題：David Littlejohn and S.G.Chang*
Lawrence Berkeley Laboratory,University of California,Berkeley,California 94720
Treatment of water-soluble carboxylic acids with concentrated hydrogen peroxide generates solutions of peracids.These compounds can rapidly oxidize NO,and SO2 to their respective oxyanions,making them useful in flue gas treatment.The properties of performic acid,peracetic acid,and perpropionic acid are reported and are compared with peroxymonosulfuric acid.The chemistry of NO,and SO2 removal by these compounds is discussed.
正文：
Aqueous solutions of a number of oxidizing compounds have been studied to determine their effectiveness in re- moving NO,and SOz from flue gas (Kobayashi et al.,1977).A wet process exists using hydrogen peroxide to remove NO,and SOz from flue gas,but it is only effective under very acidic conditions (Cooper,1984).The process de- veloped by Cooper requires an acidic medium because hydrogen peroxide is a much more effective oxidizing agent in the form of H302+,which exists in acidic conditions (Purcell and Kotz,1977).The process needs an alkaline wash of the treated gas to remove volatilized nitrogen oxides from the acidic peroxide solution.We have made further studies of oxidizing compounds to determine their usefulness in flue gas clean-up systems.One class of compounds that has been found to be effective in NO,and SOp removal is that of peroxyacids,or peracids.Peracids have been found to function over a much wider pH range than hydrogen peroxide alone.They are formed by a reaction of hydrogen peroxide and some compounds con- taining a carboxylic acid group.Performic acid (PFA),peracetic acid (PAA),and perpropionic acid (PPA) were studied and compared with peroxymonosulfuric acid (PMSA),also known as Caro's acid.
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