Removal of carbon disulfide by droplet-triggered gas discharge reaction

Abstract

A novel discharge reactor was designed, utilizing the transient passage of liquid droplets between the electrode pairs to trigger a gas discharge. The reactor was employed to investigate the degradation of carbon disulfide (CS_2) exhaust gas, and the study examined the effects of various parameters including input energy, droplet dropping frequency, gas flow rate, oxygen concentration, and solution composition on the degradation process. The results demonstrated the effective removal and degradation of CS_2 gas from the gas stream using the droplet-triggered gas discharge reactor. During the gas discharges, the droplets absorbed the gas-phase reaction products, thereby promoting the degradation of CS_2. Optimal CS_2 removal was achieved with a droplet dropping frequency of 0.5~1 drop/s. The removal rate decreased with slower frequencies, while higher frequencies led to increased energy consumption. Among the same conditions, the lowest CS_2 removal rate was observed when deionized water was used as the absorbent droplet, followed by a 5% aqueous sodium sulfate solution. The highest removal rate was achieved with a 5% sodium hydroxide solution. The gas-phase products of the CS_2 degradation reaction mainly consisted of SO_2, CO_2, and a small amount of intermediate product COS, while the liquid-phase products were sulfate ions. Furthermore, the degradation mechanism was analyzed.

Keywords

• gas discharge
• carbon disulfide
• carbon oxysulfide