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SF6安全保障专家
专注于SF6气体检测的专业化
How is sulfur hexafluoride gas generated (prepared)?
发布时间：2017-05-15
来源：ydlcb 浏览次数：36次
SF6 gas has a century-old history, it is two French chemists Moissan and Lebeau synthetic artificial inert gas in 1900, around 1940, the United States military used it for the Manhattan Project (nuclear military). Commercially available in 1947. At present, SF6 gas is mainly used in the power industry. SF6 gas is used in 4 types of electrical equipment as insulation and/or arc extinguishing; SF6 circuit breakers and GIS (in this case, sulfur hexafluoride enclosed combination appliances, internationally known as "Gas Insulated Switchgear"), SF6 load switchgear, SF6 insulated transmission lines, SF6 transformers and SF6 insulated substations. 80% is used for high voltage power equipment.
It is obtained by the direct combination of fluorine and sulfur. The reaction also produces other fluorides of sulfur, such as sulfur decafluoride, which can be purified by disproportionating them with heat and then treating them with sodium hydroxide to remove the remaining sulfur tetrafluoride.
Original method: Burning sulfur in fluorine gas.
At present, the method of producing SF6 gas in chemical industry is mainly the direct combination reaction of elemental sulfur and excessive gaseous fluorine. That is S+3F2→SF6+Q (giving off heat). The composition and content of the impurities vary greatly due to the purity of the raw materials, the material of the production equipment, the process conditions and other factors, and the total content of impurities can reach 5%. It consists of sulfur fluorine compounds, such as: S2F2, SF2, SF4, S2F1O, etc. Sulfur fluoro compounds such as SOF2, SO2F2, SOF4, S2F10O, etc., and impurities brought into the raw materials such as HF, OF2, CF4, N2, O2, etc. If you want to use high-voltage electrical equipment, it is necessary to purify impurities in the crude product, and the synthesized SF6 gas also needs to go through a series of purification processes such as washing, alkali washing, pyrolysis (removal of highly toxic decafluorides), drying, adsorption, freezing, distillation and purification to obtain products with a purity of more than 99.8%. Then it is pressurized with a compressor and filled into a cylinder that is cooled to about -80 ° C and exists in liquid form.