METHOD OF PRODUCING LIQUID ORGANIC HYDROGEN CARRIER FROM COAL TAR Russian patent published in 2024 - IPC C01B3/26 

FIELD: hydrogen power engineering; organic chemistry; catalysis.

SUBSTANCE: invention relates to development of a liquid organic hydrogen carrier (LOHC). Method is carried out by catalytic processing of oil stock with subsequent fractionation of the obtained product and extraction of a fraction of the liquid organic hydrogen carrier. Coal tar fraction with end boiling point of 427 °C is used as oil raw material, and hydrogenation of which is carried out at temperature of 390 °C, hydrogen pressure of 20 MPa, volumetric feed rate of 0.5 h⁻¹ and hydrogen circulation rate of 2,500 nm³/m³ of raw material in the presence of NiW-Al₂O₃ catalyst containing 15.5–16.5 wt.% nickel and 30.0–33.0 wt.% tungsten, to a residual content of total sulfur in the fraction of less than 3 mg/kg followed by separation by fractionation of the liquid organic hydrogen carrier fraction with initial and final boiling temperatures of 166–192 and 237–252 °C, respectively, and containing in hydrogenated form, wt.%: aromatic hydrocarbons—not more than 0.6, paraffin hydrocarbons—not more than 0.2, and mono-, bi- and tricyclic naphthenic hydrocarbons—the rest. Composition of naphthenic hydrocarbons contains alkyldecalins of not less than 43.5 wt.%, and the hydrogenated form of the liquid organic hydrogen carrier is characterized by a crystallisation onset temperature below −60 °C.

EFFECT: increase of hydrogen capacity of liquid organic hydrogen carrier—not less than 8,4 %, production of liquid organic hydrogen carrier with total sulfur content of less than 3 mg/kg using an economical and environmentally friendly method.

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