METHOD FOR PRODUCING BIODIESEL FUEL FROM VEGETABLE OIL IN SUPERCRITICAL CONDITIONS AND UNIT FOR IMPLEMENTATION THEREOF Russian patent published in 2022 - IPC C11C3/00 C10L1/00 C11C3/10 C11C3/04 C07C67/02 C10G3/00 

FIELD: fuel.

SUBSTANCE: invention relates to a method for producing biodiesel fuel and can be used in fat and oil, fuel and other industries. The method for producing biodiesel fuel includes interesterifying vegetable oil with supercritical alcohol in a volume ratio of 1:10 to 1:15 at a temperature of 250 to 280°C, a pressure of 15 MPa, condensing vapours of excess alcohol at a temperature of 60 to 80°C, extracting the resulting reaction mixture with carbon dioxide in supercritical conditions at a temperature of 240 to 260°C, a pressure of 15 MPa, cooling the resulting biodiesel mixture to a temperature of 20 to 30°C, separating glycerin from the resulting biodiesel mixture in the field of centrifugal forces, separating carbon dioxide vapours from the biodiesel mixture by the gas-liquid separation method, compressing the carbon dioxide vapuors to a pressure of 15 MPa and condensing at a temperature of minus 40°C by regenerative heat exchange with boiling ammonia produced in an absorption water-ammonia refrigeration unit, boiling the water-ammonia solution at a temperature of 130°C, condensing ammonia vapours at a temperature of 40°C, throttling the condensed ammonia and boiling at a temperature of minus 45°C, absorbing vapours of the boiling ammonia with a weak water-ammonia solution at a temperature of 35°C, heating the water before the vapour generator with spent superheated steam after the boiler to a temperature of 90°C. The invention is aimed at increasing the energy efficiency and environmental safety of the method for producing biodiesel fuel from vegetable oil with maximum regeneration and utilisation of secondary energy resources in closed thermodynamic cycles through material and heat flows using a heat pump.

EFFECT: reduced energy consumption for cooling and condensing carbon dioxide vapours per unit mass of the resulting biodiesel fuel and increased environmental safety of the method for producing biodiesel fuel in supercritical conditions.

2 cl, 1 dwg