METHOD OF PRODUCING BIOFUEL Russian patent published in 2019 - IPC C10L1/00 C10G1/00 

FIELD: production of biofuel.

SUBSTANCE: invention describes a method of producing biofuel consisting in the fact that microalgae biomass is mixed with water in amount of 90.0–97.0 wt % with maintenance during photosynthesizing microorganisms vital activity photosynthesizing microorganisms of biomass, by irradiation with light with intensity of not less than 5 W/m² for 3–10 minutes, after which the obtained microbiological suspension is subjected to hydrothermal liquefaction in the presence of a catalyst for hydrothermal liquefaction, wherein hydrothermal liquefaction is carried out in a unit, consisting of two reactors operating in turn in hydrothermal liquefaction mode and in regeneration mode of catalyst, wherein microbiological suspension is loaded into first reactor, preheated to temperature of 455–600 °C, and hydrothermal liquefaction of the suspension is carried out at pressure of 10–30 MPa for 1–9 minutes to form a liquefaction product, which is removed from the reactor, cooled and subjected to separation to obtain biofuel, an aqueous phase, a solid phase and gaseous products, then the first reactor is switched to mode regeneration of catalyst, which is carried out at temperature of 455–600 °C, and the initial microbiological suspension is fed into a second reactor operating in a temperature maintenance mode similar to that in the first reactor, the above cycle of changing operating conditions of the reactors is repeated, wherein cooling of obtained liquefaction product is carried out by heat exchange between liquefaction product and initial microbiological suspension, obtained gaseous products are directed to heating reactors, and catalyst used is catalyst for hydrothermal liquefaction of plant biomass, containing strontium oxide, or titanium oxide, or tin oxide, or a mixture thereof, a finely dispersed alumina-containing oxide support, which contains phosphates or aluminum arsenates, with the following ratio of components, wt %: strontium oxide, or titanium oxide, or tin oxide, or mixture thereof – 1–50 and fine alumina-containing oxide support, which contains phosphates or aluminum arsenates, – balance up to 100, in fluorinated and/or sulphated form.

EFFECT: technical result is higher output of biofuel, ensuring continuity of the process of producing biofuel in the process chain, eliminating the use of hazardous organic solvents and recycling side gaseous products.

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