FIELD: fuel.
SUBSTANCE: invention relates to a method of producing a biodiesel fuel from a renewable raw material. Method of producing a biodiesel fuel from a renewable raw material includes deoxygenating of the renewable material in a reaction zone of deoxygenating; separating the reaction zone effluent of deoxygenating in the first liquid-vapour separator into a vaporous flow and a liquid flow, wherein the said first liquid-vapour separator operates at a temperature within the range from about 40 °C to about 350 °C; dividing the liquid flow into a circulation part and a product part; stripping the said product part from the liquid flow in a stripping column by means of a stripping gas with separation into a head steam flow and a still flow, herewith the level of contamination in the still flow of the stripping column after the first liquid-vapour separator is less than from 1/100 to 1/1,000 from the level of contamination in the still flow of the stripping column without a liquid vapour separator, herewith the said stripping column operates at a temperature within the range from about 50 °C to about 350 °C; isomerization of the still flow of the stripping column in a reaction zone of isomerization; recirculation of the circulation part from the liquid flow into the reaction zone of deoxygenating and separation of at least part of the isomerization reaction zone effluent to obtain at least one flow of the biodiesel fuel.
EFFECT: technical result is production of lower levels of contaminants in the process flow.
8 cl, 4 dwg, 2 tbl
