The invention relates to a method for liquifying
coal mildly. The method mainly comprises steps of dry smashing
coal samples and mixing with catalyst and
hydrogen-donor
solvent to form thick liquid; heating and then injecting into a reactor I, carrying out
catalytic hydrogenation reaction on
coal and
hydrogen-donor
solvent under mild condition, continuously dissolving out soluble components in products and coal; then injecting into a reactor II, flash distilling part of the product and
solvent, rising temperature so as to split and
coke left products to generate low
boiling point compound and
coke, wherein the
coke can be used for preparing
activated carbon and
hydrogen. After the product which is vacuum flashed and purged through steam stripping is separated, different components are obtained, the component below 200 DEG C is condensed so as to obtain light oil, non-condensed gas and water, 200-300 DEG C component is condensed so as to obtain middle oil, after hydrotreating, the middle
oil can be used as hydrogen-donor solvent, 300-500 DEG C component is condensed so as to obtain heavy oil which can be used for preparing chemicals or advanced carbon materials, and the component above 500 DEG C is condensed so as to obtain
residual oil which can be used for preparing advanced carbon materials. The method has mild
reaction conditions, the reactor is
coupling, the efficient of the equipment is high, the yield of
liquid product is high, the investment of the equipment is low, and the
energy conversion efficiency is high.