Effect of ammonia desulfurization products on preparation of denitration oxidant ClO2
HE Xuejuan1,2,, DANG Xiaoqing1,,, ZHANG Yanping2, WANG Lingfeng3, ZHANG Hao1,2, HUANG Jiayu2, ZHANG Fan2 1.School of Environment & Municipal Engineering, Xi′an University of Architecture & Technology, Xi′an 710055, China 2.Air Pollution Control Technology Research Center, Chinese Academy of Environmental Sciences, Beijing 100012, China 3.Heze Environmental Protection Research Institute, Heze 274000, China
Abstract:In order to explore the feasibility and characteristics of denitration oxidant ClO2 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 ClO2 in absorption liquid. The results showed that at the reaction temperature of 50 ℃, H2SO4 concentration of 9 mol·L?1, (NH4)2SO3 concentration of 1.25 mol·L?1, and reaction time of 30 min, the highest concentration of ClO2 in the absorption solution was up to 1 336 mg·L?1, which could meet the requirements of ClO2 oxidative denitration; among various influencing factors, H2SO4 concentration had the greatest influence on ClO2. When the H2SO4 concentration increased from 6 mol·L?1 to 9 mol·L?1, the concentration of ClO2 in the absorption bottle increased from 222.59 mg·L?1 to 1 335.55 mg·L?1, with an increase ratio of 83.33%. The above research results can provide reference for the preparation of ClO2 oxidant in ClO2 oxidative denitration. Key words:ammonium sulfite/ reducing agent/ preparation of ClO2.
DESHWAL B R, LEE H K. Manufacture of chlorine dioxide from sodium chlorate: State of the art[J]. Journal of Industrial and Engineering Chemistry, 2005, 11(3): 330-346.
[2]
GORDON G, ROSENBLATT R G K A. The chemistry of chlorine dioxide[J]. Progress in Inorganic Chemistry, 2007, 15: 201-286.
[3]
COUNCIL T A C. Chlorine Dioxide[M]. Denver, CO: The Foundation and American Water Works Association, 2002.
[4]
VENKATNARAYANAN S, SRIYUTHA MERTHY P, KIRUBAGARAN R, et al. Chlorine dioxide as an alternative antifouling biocide for cooling water systems: Toxicity to larval barnacle Amphibalanus reticulatus (Utinomi)[J]. Marine Pollution Bulletin, 2017, 124(2): 803-810. doi: 10.1016/j.marpolbul.2017.01.023
[5]
BERG E M A A. A Review of chlorine dioxide in drinking water treatment[J]. American Water Works Association, 1986, 6: 62-72.
TILAK B V, RADER K V A C. On the mechanism of sodium chlorate formation[J]. Journal of the Electrochemical Society, 1981, 128(6): 1228-1232. doi: 10.1149/1.2127599
AIETA E M, ROBERTS P V, HERNANDEZ M. Determination of chlorine dioxide, chlorine, chlorite, and chlorate in water[J]. American Water Works Association, 1984, 76(1): 64-70. doi: 10.1002/j.1551-8833.1984.tb05263.x
CHIEN T W, CHU H, HSUEH H T. Kinetic study on absorption of SO2 and NOx with acidic NaClO2 solutions using the spraying column[J]. Journal of Environmental Engineering, 2003, .129(11): 967-974. doi: 10.1061/(ASCE)0733-9372(2003)129:11(967)
[21]
DESHWAL B R, JIN D S, LEE S H, et al. Removal of NO from flue gas by aqueous chlorine-dioxide scrubbing solution in a lab-scale bubbling reactor[J]. Journal of Hazardous Materials, 2008, 150(3): 649-655.
1.School of Environment & Municipal Engineering, Xi′an University of Architecture & Technology, Xi′an 710055, China 2.Air Pollution Control Technology Research Center, Chinese Academy of Environmental Sciences, Beijing 100012, China 3.Heze Environmental Protection Research Institute, Heze 274000, China Received Date: 2020-03-14 Accepted Date: 2020-05-07 Available Online: 2021-01-13 Keywords:ammonium sulfite/ reducing agent/ preparation of ClO2 Abstract:In order to explore the feasibility and characteristics of denitration oxidant ClO2 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 ClO2 in absorption liquid. The results showed that at the reaction temperature of 50 ℃, H2SO4 concentration of 9 mol·L?1, (NH4)2SO3 concentration of 1.25 mol·L?1, and reaction time of 30 min, the highest concentration of ClO2 in the absorption solution was up to 1 336 mg·L?1, which could meet the requirements of ClO2 oxidative denitration; among various influencing factors, H2SO4 concentration had the greatest influence on ClO2. When the H2SO4 concentration increased from 6 mol·L?1 to 9 mol·L?1, the concentration of ClO2 in the absorption bottle increased from 222.59 mg·L?1 to 1 335.55 mg·L?1, with an increase ratio of 83.33%. The above research results can provide reference for the preparation of ClO2 oxidant in ClO2 oxidative denitration.