METHOD FOR OBTAINING BIOFUEL Russian patent published in 2023 - IPC C10G1/00 C10L1/00 

FIELD: technology for producing biofuels.

SUBSTANCE: method for producing biofuel is proposed, including preliminary mixing of microalgae biomass with water, hydrothermal liquefaction of the obtained microbiological suspension in at least one block of the reactor heated to a temperature of 600°C at a pressure of 10-30 MPa for 1-9 min with formation of a liquefaction product, which is removed from the reactor, subjected to separation and cooling to obtain biofuel, an aqueous phase, a solid phase and gaseous products, which are sent for heating of the reactor, while biomass of microalgae is premix-ed with water in the amount of 90.0-97.0% by weight, the prepared microbiological suspension is first sent to at least one buffer tank, which, after filling, is sealed and neutral gas is fed into it at a pressure corresponding to the biomass liquefaction pressure, then, under the action of the specified pressure, the prepared biomass is fed into the working path of the hydrothermal liquefaction reactor, including the first cavity of the recuperative heat exchanger, the working volume of the reactor, the second cavity of the recuperative heat exchanger and the cooled tank for receiving liquefaction products, from which the resulting gaseous products are sent to the first inlet of the multi-fuel heater of the hydrothermal reactor liquefaction, the products in the liquid phase are sent to the suction filter, from which the products in the solid phase are sent to the second inlet of the multifuel reactor heater, and the remaining products in the liquid phase are sent to the decanter, from which part of the liquid fuel is sent to the third inlet of the multifuel reactor heater, the fourth inlet of which is connected to the output of the network gas supply line.

EFFECT: increase in yield of the target product and a decrease in heat losses in the hydrothermal liquefaction unit while increasing the productivity, manufacturability and energy efficiency of the unit.

1 cl, 2 ex