Direct coal liquefaction circulating hydrogen-donor solvent as well as preparation method and application thereof

The invention provides a direct coal liquefaction circulating hydrogen-donating solvent and a preparation method and application thereof, the circulating hydrogen-donating solvent provided by the preparation method provided by the invention can be used for obtaining the circulating hydrogen-donating solvent with good hydrogen-donating capacity through a relatively simple process flow. The preparation method comprises the following steps: 1) carrying out first fractionation on the direct coal liquefaction oil 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 middle oil and the liquefied heavy oil subjected to the first-stage hydrogenation reaction in the step (2) into a second hydrogenation reactor, and carrying out a second-stage hydrogenation reaction, so as to obtain hydrogenated product oil; 4) performing second fractionation on the hydrogenated product oil to obta