Method for the generation of recycle solvents in coal liquefaction
US4334977A · kind A · utility
19Cited by
15References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1981 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Jan 15, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S208/952
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method is described to improve a coal liquefaction process by the use of a recycle solvent comprised of two fractions: the first, a lower boiling fraction, is obtained by an atmospheric distillation and is subsequently hydrotreated to enrich its hydrogen donor capacity; the second is a higher boiling fraction that is enriched in desirable hydrogen transfer agents by a solvent extraction process. The combined recycle solvent thus obtained is more efficient in transferring gas phase H.sub.2 to the coal and enables other significant process improvements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.