A method for treatment of liquid hydrocarbons, where purification, desulfurization and reduction of aromatic compounds of liquid hydrocarbons is achieved by - circulating liquid hydrocarbons in a device that includes a vessel having, in an upper part, an entry and pressure lock inlets for liquid hydrocarbons to be treated and pressure lock inlets for solid or molten metallic sodium, and, in a lower region, pressure lock outlets (6, 9) for liquids and reaction products, and having attached a pressurizable pump- and dispersion circuit comprising of at least one pumping unit and at least one dispersing unit, a flow pipe connecting the dispersion unit with a re-entry into the vessel and a throttle valve located short before the re-entry into the vessel, - introducing liquid hydrocarbons to be treated through the entry into the vessel and, - adding metallic sodium at liquid temperatures higher 100°C, preferably higher 240°C, most preferably higher 280°C, - then passing the sodium-containing liquid through the pumping unit to be pressurized to values between 1-100 bar, preferably 5-50 bar, most preferably 25-35 bar, - then passing the sodium-containing pressurized liquid through a high shear disperser unit to form sodium particles of sizes below 2 microns and simultaneously disperse those sodium particles into the hydrocarbon liquid and - then passing this liquid with the mixed-in sodium particles through the flow pipe connecting the dispersion unit with the re-entry into the vessel, and, - by adjusting the flow rate in the flow pipe by means of the throttle valve, keeping the applied pressure and adjusting a residence time in the flow pipe of at least 2 seconds, preferably 15 seconds, most preferably longer 30 seconds, wherein the treatment time of the liquid hydrocarbons in the device amounts, from the moment of sodium input, between 2 and 120 minutes, preferably between 5 and 20 minutes. - circulating liquid hydrocarbons in a device that includes a vessel having, in an upper part, an entry and pressure lock inlets for liquid hydrocarbons to be treated and pressure lock inlets for solid or molten metallic sodium, and, in a lower region, pressure lock outlets (6, 9) for liquids and reaction products, and having attached a pressurizable pump- and dispersion circuit comprising of at least one pumping unit and at least one dispersing unit, a flow pipe connecting the dispersion unit with a re-entry into the vessel and a throttle valve located short before the re-entry into the vessel, - introducing liquid hydrocarbons to be treated through the entry into the vessel and, - adding metallic sodium at liquid temperatures higher 100°C, preferably higher 240°C, most preferably higher 280°C, - then passing the sodium-containing liquid through the pumping unit to be pressurized to values between 1-100 bar, preferably 5-50 bar, most preferably 25-35 bar, - then passing the sodium-containing pressurized liquid through a high shear disperser unit to form sodium particles of sizes below 2 microns and simultaneously disperse those sodium particles into the hydrocarbon liquid and - then passing this liquid with the mixed-in sodium particles through the flow pipe connecting the dispersion unit with the re-entry into the vessel, and, - by adjusting the flow rate in the flow pipe by means of the throttle valve, keeping the applied pressure and adjusting a residence time in the flow pipe of at least 2 seconds, preferably 15 seconds, most preferably longer 30 seconds,