氨法脱硫产物对制备脱硝氧化剂ClO2的影响

Effect of ammonia desulfurization products on preparation of denitration oxidant ClO_(2)

为探究氨法脱硫产物亚硫酸铵制备脱硝氧化剂ClO_(2)的可行性及其特性,采用实验室自行搭建的反应系统,重点考察了反应温度、反应时间、H2SO4浓度及(NH4)2SO3浓度等因素对吸收液中ClO_(2)浓度、收率及纯度的影响。结果表明:在反应温度为50℃,H2SO4浓度为9 mol·L^(-1),(NH4)2SO3浓度为1.25 mol·L^(-1),反应时间为30 min的条件下,吸收液中ClO_(2)的浓度最高可达1336 mg·L^(-1),可满足ClO_(2)氧化脱硝的要求;在各种影响因素中,H2SO4浓度对ClO_(2)影响最大,当H2SO4浓度由6 mol·L^(-1)升高至9 mol·L^(-1)时,吸收瓶中ClO_(2)浓度由222.59 mg·L^(-1)上升至1335.55 mg·L^(-1),可升高83.33%。以上研究结果可为ClO_(2)氧化脱硝中的氧化剂ClO_(2)的制备提供参考。

In order to explore the feasibility and characteristics of denitration oxidant ClO_(2) preparation from ammonia desulfurization product of ammonium sulfite,the self-made reaction system in lab was used to study the effects of reaction time,H2SO4 concentration and(NH4)2SO3 concentration and other factors on the concentration,yield and purity of ClO_(2) in absorption liquid.The results showed that at the reaction temperature of 50℃,H2SO4 concentration of 9 mol·L^(-1),(NH4)2 SO3 concentration of 1.25 mol·L^(-1),and reaction time of30 min,the highest concentration of ClO_(2) in the absorption solution was up to 1336 mg·L^(-1),which could meet the requirements of ClO_(2) oxidative denitration;among various influencing factors,H2SO4 concentration had the greatest influence on ClO_(2).When the H2SO4 concentration increased from 6 mol·L^(-1) to 9 mol·L^(-1),the concentration of ClO_(2) in the absorption bottle increased from 222.59 mg·L^(-1) to 1335.55 mg·L^(-1),with an increase ratio of 83.33%.The above research results can provide reference for the preparation of ClO_(2) oxidant in ClO_(2) oxidative denitration.