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.
A large amount of
sulfuryl fluoride (SO2F2) is released into the
atmosphere after fumigation, intensifying
the greenhouse effect. Therefore, it is important to remove SO2F2 generated in fumigation. In this study, the
solubilities of SO2F2 in 2-butoxyethyl acetate
(BOEA), 3-methoxybutyl acetate (MOBA), 2-methoxyethyl acetate (MOEA),
1-methoxy-2-propyl acetate (MOPA), and 2-(2-ethoxyethoxy)ethyl acetate
(DEOEA) were determined at T = (293.15 to 323.15)
K and pressures up to about 600 kPa using the isochoric saturation
method. Results showed that SO2F2 solubility
in the five acetate derivatives increased with increasing pressure
and decreased with increasing temperature. The dissolution of SO2F2 in these solvents belonged to a physical process.
Furthermore, the Henry’s law constants and thermodynamic properties
including standard Gibbs free energy, enthalpy, and entropy changes
of SO2F2 dissolution were further obtained.
Compared with water, these five selected acetate derivatives showed
potential application for SO2F2 removal. Moreover,
the solubilities of SO2F2 in these solvents
followed the order of MOBA > MOPA > BOEA > DEOEA > MOEA.
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