RECYCLED HYDROGEN-DONOR SOLVENT FOR DIRECT COAL LIQUEFACTION AND PREPARATION METHOD THEREFOR AND USE THEREOF

The present invention provides a recycled hydrogen-donor solvent for direct coal liquefaction and a preparation method therefor and a use thereof. By using the preparation method of the present invention to provide a recycled hydrogen-donor solvent, a recycled hydrogen-donor solvent having a good hydrogen-donating capability can be obtained by means of a relatively simple process flow. The preparation method comprises the following steps: 1) carrying out first fractionation on oil from direct coal liquefaction to obtain liquefied medium oil and liquefied heavy oil; 2) feeding the liquefied heavy oil into a first hydrogenation reactor for a first-stage hydrogenation reaction; 3) feeding the liquefied medium oil and the liquefied heavy oil having undergone the first-stage hydrogenation reaction in step 2) into a second hydrogenation reactor for a second-stage hydrogenation reaction to obtain hydrogenated product oil; 4) carrying out second fractionation on the hydrogenated product oil to obtain medium-temperature solvent oil and high-temperature solvent oil; and 5) mixing the medium-temperature solvent oil and the high-temperature solvent oil to prepare the recycled hydrogen-donor solvent.