Patent ID: 8597503

Claim:
A coal liquefaction system, comprising: a reactor for exposing a coal to a hydrogenated vegetable oil in the presence of a coal-derived solvent to form a slurry; a heater that elevates the temperature of the slurry in the reactor to facilitate liquefying the coal and liberating a volatile matter; a centrifuge that separates the insoluble components from the slurry to obtain a de-ashed coal extract, wherein the coal extract is suitable for downstream processing; a distillation column that distills the de-ashed coal extract to obtain a pitch; and a coker that cokes at least one of the de-ashed coal extract and the pitch to obtain a coke, wherein the coker comprises a coated coking drum that receives the de-ashed coal extract or the pitch, wherein the coking drum is coated with a coating comprising chromium, aluminum, nickel, or an alloy thereof.