In order to meet the requirement for basic data of coal direct liquefaction in hydrogen-rich gas

the data of the high-pressure solubility of methane in the mixture of atmospheric No.3 diesel oil and tetrahydrofuran at temperature from 273.45 K to 293.75 K and pressure from 2.09 MPa to 7.97 MPa were collected with a self-established apparatus that measured the solubility in the cyclic way.The average structural parameters and characteristic parameters of diesel oil were calculated with the n-d-M-LP method and Constantinou-Gani method.The regression analysis of binary interactive-parameters of methane-diesel-tetrahydrofuran with the Peng-Robinson cubic equation of state combined by two mixing rules was used to estimate the solubility data under the same condition which well agreed with experimental data.