Abstract <p>The paper presents the results of studies on the effect of process parameters (temperature, hydrogen pressure, reaction time, and coal/tetralin weight ratio) on the hydrofluidization of Barzas sapromixite in the presence of a hydroaromatic hydrogen-donor solvent (tetralin) and catalytic additives (2.5 wt % Fe₂O₃, 0.5 wt % MoO₃, and 2.5 wt % Fe₂O₃ + 0.5 wt % MoO₃). It was found that the yield of the liquid products of sapromixite conversion initially increased with the heat treatment temperature; then, it passed through a maximum at ~450°C and decreased above this temperature. Based on the experimental studies, the following optimal conditions for liquefaction of Barzas sapromixite were determined to ensure the yield of liquid component fractions of 55–60 wt % based on the organic matter of coal upon its heat treatment: <i>T</i> = 450°C, <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({{P}_{{{{{\text{H}}}_{{\text{2}}}}}}}\)</EquationSource> <!--SolfChem2560031Ushakov-m1--> </InlineEquation>&#xa0;= 12–13 MPa, <i>t</i> = 20 min, and weight dilution of coal/tetralin = 1 : 2. It was shown that the yield of carbon residue significantly decreased with the addition of the catalysts, but the yields of liquid and gaseous compounds increased to indicate an increase in the degree of conversion of the sapromixite and the formation of lighter products.</p>