Polarity gradient extraction method
US4455216A · kind A · utility
31Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1980 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Dec 4, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved method for recovering and deasphalting tar sands comprises the use of at least two solvents in an extraction column to establish a liquid polarity gradient within it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.