Deasphalting and demetallizing heavy oils
US4747936A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1986 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Dec 29, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/003
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An improved method for deasphalting and demetallizing heavy oils, where the improvement is a counterflow washing step which increases the yield of the product oil. A heavy oil feedstream is contacted in a countercurrent manner with a solvent in a multi-stage extraction zone and a resulting light phase stream is heated and passed into a settling zone. A second light phase stream comprised of the product deasphalted and demetallized oil and solvent is separated from a contaminant-laden heavy phase in the settling zone. The contaminant-laden heavy phase, which is termed a resin phase, contains an equilibrium amount of DMO and solvent. DMO-enriched solvent is displaced from the resin stream by means of a counterflow washing process using pure solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.