METHOD OF PRODUCING BIODIESEL FUEL AND INSTALLATION FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC C11C3/10 C10L1/02 C10G3/00 C07C67/02 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of producing biodiesel fuel and can be used in oil and fat, fuel and other industries. Method of producing biodiesel fuel involves re-esterification of vegetable oil with supercritical alcohol in volume ratio of 1:10–1:15 at temperature of 250–280 °C, pressure 15 MPa, condensation of excess alcohol vapor at temperature of 60–80 °C, extraction of obtained reaction mixture with carbon dioxide in supercritical conditions at temperature 240–260 °C, pressure 15 MPa, cooling the obtained biodisel mixture to temperature of 20–30 °C, separation of glycerine from the obtained biodisel mixture in the centrifugal force field, separation of carbon dioxide vapors from the biodisil mixture by gas-liquid separation, compression of carbon dioxide vapor to 15 MPa and condensation at temperature minus 40 °C, heating of liquefied carbon dioxide to supercritical temperature with return to extraction in closed cycle mode. Plant for producing biodiesel fuel comprises a re-esterification reactor with a coil and a blade mixer; supercritical fluid CO₂-extractor; dish-shaped separator for separation of reaction products into biodiesel mixture and glycerine, gas-liquid separator for separation of biodiesel fuel from carbon dioxide and additionally equipped with settler for separation of water from biodiesel fuel; as well as two-stage compressor, evaporator of refrigerating unit, reservoir for liquefied carbon dioxide, a high pressure pump and a recuperative heat exchanger for heating liquefied dioxide, arranged in series in a carbon dioxide return line; plant is equipped with steam ejector heat pump for preparation of heat carriers of different temperature potential.

EFFECT: invention allows to reduce specific heat and power consumption during processing of vegetable oil into pure biodiesel fuel and to increase environmental safety of the whole production cycle.

2 cl, 1 dwg, 1 ex