The Exxon Donor Solvent (EDS) coal liquefaction system is a direct liquefaction procedure being developed by the Exxon Corporation. Coal is chemically reacted and dissolved in a recycle solvent that is hydrogenated between passes to the liquefaction reactor. More than 2.6 barrels (0.41 m 3) of a synthetic crude boiling below 1000 °F (538 °C) are produced per ton (0.907 t) of dry, high volatile coal feed. Other ranks of coal can be effectively liquefied. The process development has proceeded to a 250 ton/day (227 t/day) pilot plant stage that went into operation in June 1980. The presentation addresses the chemical reactions and process conditions that result in ease of operability and flexibility of the EDS process.
EDS coal liquefaction process development, Phase V. Engineering design study of an EDS Illinois bottoms fired hybrid boiler