Raw material recovery technology in sulfur tetrafluoride production

Abstract

The invention discloses a raw material recovery technology in sulfur tetrafluoride production, and relates to the technical field of production of fluorine chemical products. The raw material recoverytechnology in the sulfur tetrafluoride production comprises following steps: protective measures before preparation of sulfur tetrafluoride, preparation work of sulfur tetrafluoride, pre-preparationof sulfur tetrafluoride, preparation of sulfur tetrafluoride, standby work after product preparation, primary fractional distillation of sulfur tetrafluoride, secondary fractional distillation of sulfur tetrafluoride, capturing of sulfur tetrafluoride, tail gas treatment of product preparation, recovery of product raw materials and detection of product raw materials. According to the technology, sulfur tetrafluoride is subjected to fractional distillation two times firstly, crude sulfur tetrafluoride can be effectively changed into primary sulfur tetrafluoride, needless impurities are removedby one step, then impurities in tail gas can be effectively removed, a processing instrument is effectively cleaned, so that degree of purification of sulfur tetrafluoride by the instrument is increased, and the raw material recovery rate of sulfur tetrafluoride is further increased.

Description

technical field [0001] The invention relates to the technical field of production of fluorine chemical products, in particular to a raw material recovery process in the production of sulfur tetrafluoride. Background technique [0002] Abroad, the United States uses alkali metal fluoride and sulfur to react to synthesize sulfur tetrafluoride; the United States also uses fluorine gas and sulfur to directly react to generate sulfur tetrafluoride (SF4): which contains sulfur hexafluoride (SF6), sulfur difluoride ( SF2), and impurities such as decafluorooxydisulfide (S20F10) with high toxicity; the utilization rate of fluorine is low, the impurity content is high, the leaching and purification treatment is difficult, the recovery rate is low, and the waste is large. [0003] At present, most of the raw material recovery processes in the production of sulfur tetrafluoride in the domestic market are too simplistic, especially the purification of sulfur tetrafluoride in the existing...

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Problems solved by technology

[0002] Abroad, the United States uses alkali metal fluoride and sulfur to react to synthesize sulfur tetrafluoride; the United States also uses fluorine gas and sulfur to directly react to generate sulfur tetrafluoride (SF4): which contains sulfur hexafluoride (SF6), sulfur difluoride ( SF2), and impurities such as decafluorooxydisulfide (S20F10) with high toxicity; the utilization rate of fluorine is low, the impurity content is high, the leaching and purification treatment is difficult, the recovery rate is low, and the waste is large

[0003] At present, most of the raw material recovery processes in the production of sulfur tetrafluoride in the domestic market are too simplistic, especially the purification of sulfur tetrafluoride in the existing recovery process is too rough, so that the final recovered raw materials are not pure enough , and the existing recycling process is too simple for the treatment of tail gas and the cleaning of impurities, which will reduce the work efficiency of sulfur tetrafluoride raw material recovery, thereby further reducing the practicality of the raw material recovery process in the production of sulfur tetrafluoride sex