用空气-硝酸活性炭-碱吸收法净化NOx废气

本文研究淀粉法生产草酸过程中排放的NO_x废气的处理。先用空气做氧化剂,提高废气中NO_x的氧化度,并经水吸收,可产生13％硝酸,其后在催化剂存在下,用此酸反复喷淋吸收NO_x,使NO_x转化为41％的硝酸。此酸可回收作为淀粉法生产草酸的原料。本文还研究了影响喷淋吸收的因素,如喷淋吸收剂的温度、浓度和喷淋速度以及催化剂品种、粒径大小,并得出喷淋吸收的最佳条件。

A New Method for the Treatment of NOx Containing Waste Gas

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.