METHOD OF PRODUCING 2,5-DI(TRIFLUOROMETHYL)-3,6-DIOXA-8-SULPHONYL FLUORIDE)PERFLUOROOCTANOYL FLUORIDE Russian patent published in 2024 - IPC C07C303/02 C07C309/82 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering and specifically to a method of producing 2,5-di(trifluoromethyl)-3,6-dioxa-8-sulphonylfluoride perfluorooctanoyl fluoride. Method involves reacting tetrafluoroethane-beta-sultone with hexafluoropropylene oxide (HFPO) in the presence of potassium fluoride at temperature of 10–20 °C and HFPO pressure of 100–250 kPa in diglyme medium with molar ratio diglyme : potassium fluoride : hexafluoropropylene oxide : tetrafluoroethane-beta-sultone equal to 0.7:0.1:1.7:1, followed by extraction of the desired product from the obtained reaction mass in a mixture with diglyme by vacuum distillation and separation of the end product from diglyme at a temperature of -20 °C. A fraction with a boiling point of 87–90 °C at atmospheric pressure, which is reacted with hexafluoropropylene oxide in the presence of potassium fluoride in a diglyme medium at molar ratio diglyme : potassium fluoride : hexafluoropropylene oxide : fraction with boiling point 87–90 °C at atmospheric pressure equal to 0.7:0.1:0.7:1, followed by extraction of the desired product from the obtained reaction mass in a mixture with diglyme by vacuum distillation and separation of the end product from diglyme at a temperature of -20 °C.

EFFECT: increasing output of the end product – 2,5-di(trifluoromethyl)-3,6-dioxa-8-sulphonylfluoride perfluorooctanoylfluoride to 90% due to utilization of by-products and optimization of process conditions, as well as simplification of the process of its production.

1 cl, 2 ex