Decomposition Treatment of SO₂F₂ Using Packed Bed DBD Plasma Followed by Chemical Absorption

Abstract

The technology of packed bed dielectric barrier discharge (DBD) plasma followed by a chemical absorption has been developed and was found to be an efficient way for decomposition treatment of sulfuryl fluoride (SO2F2) in simulated residual fumigant. The effects of energy density, initial SO2F2 concentration, and residence time on the removal efficiency of SO2F2 for the DBD plasma treatment alone were investigated. It was found that the SO2F2 could be removed completely when initial volume concentration, energy density, and residence time were 0.5%, 33.9 kJ/L, and 5.1 s, respectively. The removal mechanism of SO2F2 in the packed bed DBD reactor was discussed. Based on the detailed analysis of SO2F2 molecular stability and its exhaust products in the DBD plasma reactor, it was concluded that the energetic electrons generated in the packed bed DBD reactor played a key role on the removal of SO2F2, and the major decomposition products of SO2F2 detected were SO2, SiF4, and S (Sulfur). Among these products, SiF4 was formed by the F atom reacted with the filler-quartz glass beads (SiO2) in the packed bed DBD reactor. Aqueous NaOH solution was used as the chemical absorbent for the gaseous products of SO2F2 after plasma pretreatment. It was found that the gaseous products in the plasma exhaust could be absorbed and fixed by the subsequent aqueous NaOH solution.

Degradation of methylene blue by dielectric barrier discharge plasma coupled with activated carbon supported on polyurethane foam

“…A 1000 : 1 high voltage probe (P6015A, Tektronix) was used to measure the voltage ( U ) applied to the DBD reactor, with the signal detected and shown in a digital oscilloscope (DPO 3052, Tektronix). 26 The discharge power for the packed-bed DBD reactor was calculated using: …”

Solubilities of Sulfuryl Fluoride in 2-Butoxyethyl Acetate, 3-Methoxybutyl Acetate, 2-Methoxyethyl Acetate, 1-Methoxy-2-propyl Acetate, and 2-(2-Ethoxyethoxy)ethyl Acetate

“…Chemical methods including chemical absorption and plasma coupled with chemical absorption were proposed for the treatment of SO 2 F 2 after fumigation. , However, there are still some disadvantages including secondary pollution and difficulty to recover SO 2 F 2 . Therefore, it is meaningful to develop a green, economical, and reversible absorbent to capture SO 2 F 2 .…”

Ex Situ Generation of Sulfuryl Fluoride for the Synthesis of Aryl Fluorosulfates

“…Although sulfuryl fluoride gas is produced on an industrial scale and widely used as a fumigant, its impact on human health and the environment should not be neglected . The time-weighted average exposure limit for sulfuryl fluoride has been set at 5 ppm by the Occupational Safety and Health Administration, indicating that long-term exposure is harmful for human well-being. , The gas was also recently identified as a greenhouse gas with a global warming potential of 4800 relative to carbon dioxide and an atmospheric lifetime of 36 years . Moreover, the limited number of suppliers makes it challenging and expensive to obtain a gas cylinder, especially when taking into account the costs of transportation and disposal.…”