论文部分内容阅读
采用恒容吸收系统研究了水和稀硝酸对二氧化氮气体的吸收行为,通过测量吸收液的组成和气相压力来考察吸收剂浓度、吸收剂的量和吸收压力对NO2吸收效率和产物的影响。增加水的质量,则吸收效率增加,而所得硝酸的浓度先增加后减小。随着NO2初始压强的增加,水对NO2的吸收效率和所得硝酸浓度均增加。结果表明二氧化氮在稀硝酸中的吸收速度比在水中快,较高的气相初始压力(>90 kPa)或较高的硝酸浓度(>7wt%)都有利于吸收效率的提高。从反应关系分析计算,可获得气相组成、N2O4的转化率和HNO2的分解率等参数,发现随着水的量的增加,N2O4的转化率逐渐增大,而HNO2的分解率先增大后减小,在NO2和水的物质的量的比为0.024时达到最大值。
The absorption behavior of nitrogen dioxide gas by water and dilute nitric acid was studied by constant-capacity absorption system. The effects of absorbent concentration, amount of absorbent and absorption pressure on NO2 absorption efficiency and product were investigated by measuring the composition and gas-phase pressure . Increase the quality of water, then the absorption efficiency increases, and the resulting nitric acid concentration first increases and then decreases. With the increase of NO2 initial pressure, the absorption efficiency of NO2 and the concentration of nitric acid in water increased. The results showed that the absorption of nitrogen dioxide in dilute nitric acid was faster than that in water, higher initial gas pressure (> 90 kPa) or higher nitric acid concentration (> 7wt%) all contributed to the improvement of absorption efficiency. According to the analysis of the reaction relation, the gas phase composition, the conversion of N2O4 and the decomposition rate of HNO2 were obtained. It was found that the conversion of N2O4 increased with the increase of the amount of water, but the decomposition rate of HNO2 first increased and then decreased , Reaching the maximum when the ratio of the amount of substance of NO2 and water is 0.024.