METHOD FOR FROSTING CARBON DIOXIDE CONTAINED IN LIQUID METHANE

Method for extracting carbon dioxide in liquid methane, including expanding a liquid methane the carbon dioxide content being greater than 280 ppmv, the expansion carried out from a pressure greater than 6 bar to a pressure of 1 bar, the temperature of the liquid methane expanded being about −161.5° C., passing the methane gas phase and the carbon dioxide solid phase into a first liquid-solid-gas separator, with extraction of the solid carbon dioxide by filtration, and separation of the methane gas, to obtain a first liquid methane phase, partially decarbonized, transferring this first liquid methane phase to a second solid-liquid separator, the first liquid methane phase at −161° C., the second separator being an exchanger at less than −170° C., the carbon dioxide depositing in the second exchanger, to form a second liquid methane phase, the concentration of carbon dioxide in this second liquid methane phase at −170° C. being less than 200 ppmv.