Multi-stage coal liquefaction and fractionation method
US4664788A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1985 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Sep 19, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S208/952
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A multi-stage coal liquefaction method in which coal is slurried with a primary light solvent, such as toluene, hexane and/or cyclohexane, and a process-derived primary heavy solvent. The coal-primary solvent slurry is treated under coal-liquefying conditions to form a first feed solution containing coal liquefaction products. The first feed solution is treated by a multi-stage supercritical solvent extraction procedure. The final heavy phase produced by this procedure is mixed with a secondary solvent, such as pentane, to produce a second feed mixture, which is treated in a second multi-stage supercritical solvent extraction procedure. Heavy phases recovered from the separate stages of both solvent extraction procedures are blended to provide a recycled primary heavy solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.