Coal liquefaction process
US4372838A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1981 |
| Grant date | Feb 8, 1983 |
| Priority date | — |
| Expiry date | Mar 26, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/083
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A coal conversion process which produces an increased yield of distillable products through an efficient use of hydrogen. Coal is contacted with a liquefaction solvent comprised of a process derived light phase residuum and a process derived distillate under liquefaction conditions to form a coal conversion product effluent. The effluent is admixed with a process derived hydrogenation residuum to supply hydrogen-donors and to cool and stabilize the effluent against regressive reactions. Distillables boiling below about 1000.degree. F. then are separated from the combined stream. A portion of the distillables can be recycled for use as solvent or hydrogenated and then recycled. The remaining residuum is admixed with a deashing solvent and thereafter deashed and fractionated under elevated temperature and pressure conditions. The residuum is separated to form a light phase residuum which is recycled for use as solvent and a heavy phase residuum suitable for further up grading. The heavy phase residuum is admixed with a process derived hydrogenation distillate and introduced into a hydrogenation zone. At least a portion of the heavy phase residuum is hydrogenated to form a hydrogenati…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.