Phenolic recycle solvent in two-stage coal liquefaction process
US4133646A · kind A · utility
15Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1977 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Jun 29, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/002
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved two-stage coal liquefaction process is provided, wherein solvent-boiling range phenolics, produced in the solubilization of the coal feed, are removed wholly or partially from recycle solvent at some point in the process prior to recycle to the first stage to control the level of phenolics in both stages of the process. The two-stage process involves a mild short contact time first stage operation, the removal of inorganic sulfur, ash and coal solids followed by a second stage operation, the severity of which is controlled as a function of the final product desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.