Solvent refining of residues
US4795551A · kind A · utility
7Cited by
14References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1985 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Jul 15, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/003
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In the solvent refining of a residual oil, a mixture of refined oil and refining solvent, and a mixture of pitch impurities and refining solvent are introduced into separate zones of a combination tower operated at a pressure of no greater than 100 psig to recover refining solvent from each of the mixtures. The combination tower is preferably A modified crude distillation tower from a preexisting crude unit, whereby idle crude units may be converted to solvent refining.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.