Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
           Silicon Dioxide
           Hydrofluoric acid
           Synthetic Cryolite
           Potassium Fluoaluminate
           Ammonium bifluoride
           Potassium Bifluoride
           Aluminium fluoride
           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
           Potassium Hydroxide Flakes
           Magnesium Fluoride
           Magnesium fluorosilicate
           Barium Fluoride
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The present invention relates to a method for preparing methanesulfonyl fluoride CH3SO2F by separating the material after the reaction of methyl sulfonyl chloride with potassium fluoride.

The method comprises the following steps: (1) Mixing water, potassium fluoride(KF) and methylsulfonyl chloride CH3SO2Cl, or mixing potassium fluoride KF aqueous solution with methylsulfonyl chloride CH3SO2Cl to produce fluorination reaction; (2) Adding neutralization; (3) Cooling the crystallization; (4) The obtained material is subjected to solid-liquid separation; (5) The liquid phase obtained in the previous step is subjected to liquid-liquid separation and the oil phase proceeds to the next step; (6) The liquid phase obtained in the previous step is separated by distillation under reduced pressure, and the gas-phase condensation product is methylsulfonyl fluoride CH3SO2F. (7) The solidified liquid is subjected to solid-liquid separation; (8) The invention has the advantages that the product has high yield, good quality, low cost, process safety and environmental protection.