(445g) Efficient Removal of SO2 and NOx from Flue Gas Using Yellow Phosphorus and Phosphate Slurry As Adsorbent
- Conference: AIChE Annual Meeting
- Year: 2019
- Proceeding: 2019 AIChE Annual Meeting
- Group: Environmental Division
- Time: Wednesday, November 13, 2019 - 10:00am-10:20am
Nitrogen oxides (NOx) and sulfur dioxide (SO2) emitted from combustion of coal and fuel oils have brought about significant effects on both environment and human health, great interest is paid to develop an efficient and targeted desulfurization and denitrification method with low investment costs. Herein, a composite slurry containing yellow phosphorus and phosphate slurry was used to removal NOX from flue gas, where yellow phosphorus was considered to promote generation of ozone from oxygen. The latter can oxidize NO to form more water soluble NxOy species, finally converted to HNO2 and HNO3. These acids can react with phosphate slurry to form PO43-. Thus, the final solution containing NO3- and PO43- can be potentially used as raw materials for the production of nitrogen phosphorus compound fertilizer. Moreover, since phosphate rock was devoted as the raw material from phosphorus chemical process, consequently, its application can reduce the investment cost. Besides, the produced sulfuric acid in the present desulfurization system can obtain a replacement of sulfuric acid requriement in the typical phosphorus chemical activity. Accordingly, this reported desulfurization and denitrification technology was of environmental and economic importance, and also exhibited potential in treating other industrial SO2 and NOx pollution processes. In this study, the detailed desulfurization and denitrification mechanism and the deactivation of phosphate rock adsorbent were proposed.