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环境科学 1992
A New Method for the Treatment of NOx Containing Waste Gas
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Abstract:
In this artical, a new method for treating NOx containing waste gas generated from the process of oxalic acid production by starch method is introduced. Firstly, the oxidative extent of NOx gas is raised using air as oxidant. Then it is absorbed with water and 13% dilute nitric acid is formed. Secondly, the acid is used as an absorbent which is repeatedly sprayed over the NOx containing waste gas under the presence of catalyst, thus resulting in 41% nitric acid. The acid can be recovered as a material for the production of oxalic acid with "starch method". Through discussions on the factors which influence the effect of absorbent spray, such as temperature and concentration of the spraying absorbent, the velocity of spray, and tie variety and the sizes of the particles of the catalysts, the optimum conditions of the process are defined.
