Oil recovery method
US9115317B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2012 |
| Grant date | Aug 25, 2015 |
| Priority date | — |
| Expiry date | Oct 6, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G2400/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a method for the recovery of oil from an aqueous solution containing oil and solids, as well as to the use of products obtained by this method. The method of the invention comprises at least the following steps of: Adjusting the oil- and solids-containing aqueous solution to a pH which is acidic, separating an oil- and solids-containing fraction from the acidic aqueous solution with an separation agent which is hydrophilic or assumes a hydrophilic character in response to water, recovering the oil- and solids-containing fraction separated by means of said separation agent, extracting oil away from the solids with a water-insoluble extraction agent, and recovering the oil-containing water-insoluble extraction agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.