| 摘要 |
A process for liquefying a particulate coal feed to produce useful petroleum-like liquid products, particularly by steps which include: (a) contacting, in a liquefaction zone, said coal feed with a hydrogen donor solvent at temperature and pressure sufficient to hydroconvert and liquefy the coal (b) separating the product from the liquefaction zone by distillation into fractions inclusive of a liquid fraction which contains at least 30 weight percent, and preferably at least 50 weight percent hydrogen donor compounds, particularly those fractions boiling within about the 350 DEG -850 DEG F. range, and preferably within about the 400 DEG -700 DEG F. range, (c) hydrogenating said liquid fraction in a hydrogenation zone, (d) adding to said liquid fraction a solvent characterized as a low molecular weight heterocyclic oxygen or heterocyclic sulfur compound containing, within a molecule, from 2 to about 6 fused rings one or more of which is a five- or six-membered heterocyclic ring having 4 to 5 carbon atoms and from 1 to 2 atoms of oxygen or sulfur, and (e) recycling the hydrogenated liquid solvent mixture to said coal liquefaction zone. |
