Xiaojiang Liang,Yanren Fei,Qinglong Xie,Yang Liu,Meizhen Lu,Fan Xia,Yong Nie,Jianbing Ji
With the global phaseout of methyl bromide, much more sulfuryl fluoride (SO2F2) is pouring into the atmosphere after fumigation, intensifying the greenhouse effect. Therefore, the reduction of SO2F2 emission is urgently required. In this paper, biobased solvents are proposed to capture SO2F2. Solubilities of SO2F2 in eight biobased solvents at temperatures from 283.15 to 323.15 K and pressures up to 600 kPa are measured. On the basis of thermodynamic consideration, a parametric method is adopted to select potential physical solvents for SO2F2 absorption. Then, a preliminary quantum chemical analysis is conducted to reveal the mechanism of SO2F2 dissolution in biobased solvents. To verify the selective absorption of SO2F2 from fumigation exhaust gas, which is mainly air, the ideal selectivity of SO2F2/N2 and SO2F2/O2 is also probed. Additionally, the recyclability of biobased solvents is examined. Results show that these selected biobased solvents have significantly larger absorption capacities than water. Based on the analysis of solubility data, it is found that bis(2-ethylhexyl) azelate with higher SO2F2 capacity also has smaller Hildebrand solubility parameter and larger SO2F2–solvent interaction energy. Moreover, the interactions between SO2F2 and biobased solvents are revealed to be dispersion interactions. The ideal selectivity of SO2F2/N2 and SO2F2/O2 ranging from 19.98 to 126.93 proves that the selective absorption of SO2F2 is feasible. In addition, the solubility of SO2F2 in bis(2-ethylhexyl) azelate is almost unchanged after six absorption–desorption cycles.
Jiayan Deng,Min Peng,Zhanyang Gao,Yi Wang,Baoshan Wang,Wenjun Zhou,Ruichao Peng,Yunbai Luo
Sulfur hexafluoride (SF6), which is known as a superior electrically insulating and arc-quenching medium, plays a decisive role in the modern transmission and distribution network of electric energy, especially in high-voltage power networks. However, the ever-increasing usage of SF6 also leads to the continuous escalation of atmospheric SF6 levels, which is considered to be the main cause of the greenhouse effect. To decrease this environmental impact, eco-friendly alternatives to SF6 have been researched for decades. To date, no significant success has been made regarding replacement gases for transmission networks. Some potential alternatives have comparatively lower global warming potential (GWP) but involve technical trade-offs. Thiazyl trifluoride, which has some excellent chemical and electric properties, is a novel substitution candidate for SF6. In this article, an efficient synthetic route starting from sulfur monochloride and followed by ammonization and fluorination was proposed. The structures of the intermediates and the target products were determined by X-ray diffraction (XRD), infrared spectroscopy (IR), and gas chromatography-mass spectrometry (GC-MS). The effects of some determining factors on the yield and purity, including the molar ratio of the reactants, recrystallization conditions and condensation temperature, were also investigated. The results showed that the overall yield of thiazyl trifluoride was approximately 25%, while the purity could be up to 90.6% under optimal conditions.
Xiaojiang Liang,Shilin Ye,Qinglong Xie,Meizhen Lu,Fan Xia,Yong Nie,Zhiyan Pan,Jianbing Ji
The solubilities of sulfuryl fluoride (SO 2 F 2 ) in propylene carbonate (PC), tributyl phosphate (TBP) and N-methylpyrrolidone (NMP) was measured by isochoric saturation method at the pressure of up to 600 kPa and temperatures ranging from (293.15 to 313.15) K. Results showed that SO 2 F 2 solubility increased with increasing pressure and decreased with increasing temperature in the three solvents, and the dissolution of SO 2 F 2 in the solvents was a physical process. Moreover, Henry’s law constants and thermodynamic properties such as standard Gibbs free energy, enthalpy, and entropy changes of SO 2 F 2 solvation were further calculated according to the experimental solubility data. The solubility of SO 2 F 2 in these three solvents followed the order of TBP > PC > NMP. The results illustrated that TBP possessed the potentiality to capture SO 2 F 2 among the present absorbents due to the relatively large solubility and low absorption enthalpy for SO 2 F 2 .
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