Hydrogen donor solvent coal liquefaction process
US4022680A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1975 |
| Grant date | May 10, 1977 |
| Priority date | — |
| Expiry date | Dec 17, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/065
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
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.degree.-850.degree. F. range, and preferably within about the 400.degree.-700.degree. 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.