Process for secondary recovery of bitumen in hot water extraction of tar sand
US4172025A · kind A · utility
19Cited by
4References
3Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | May 11, 1978 |
| Grant date | Oct 23, 1979 |
| Priority date | — |
| Expiry date | May 11, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G1/047
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
It has been found that tank-type air flotation cells are more efficient, when treating hot water process middlings containing in excess of about 3% bitumen, than trough-type air flotation cells. Also, it has been found that the trough-type cells are more efficient than the tank-type cells when treating middlings containing less than about 3% bitumen. Thus a secondary recovery circuit is proposed wherein the middlings are first treated in one or more tank-type cells in series and the underflow from the last tank-type cell is treated in one or more banks of trough-type cells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.