Thermodynamic Model to Study Removal of Chlorine, Silicon Tetrafluoride and other Uncommon Materials from Off Gases

Abstract

Off-gasses of a process require treatment to either neutralize or remove the toxic constituents. To accurately remove different materials in a gaseous stream, their interaction with multiple components is important to understand. The economic and the environmental impact from the failure to do so would be significant. In a particular off gas, the effects of fluorides like HF and SiF4, SiO2 is studied in tandem with the presence of traditional off gas components like NOx and chlorine, particularly at low concentrations. This work would be useful for several industries like chemicals and mining. Traditionally these off gasses are cleaned in scrubbers and the effluent is discharged. If the pH of the effluent is not regulated, the effluent could have a significant impact in the aquatic ecosystem. This makes prediction of NO3- and NO2- concentration in the effluent, very important. The thermodynamic model was developed to be used in scrubber modelling.