Two-step heterocyclic nitrogen extraction from petroleum oils
US4960507A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1989 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Oct 6, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the removal of basic heterocyclic nitrogen compounds from petroleum oils which comprises: (a) contacting said petroleum oils containing basic heterocyclic nitrogen compounds with an aqueous solution of an acidic solvent at extraction conditions in a first contacting zone, (b) separating the product of step (a) into a raffinate product stream comprising hydrocarbons having a lean content of basic heterocyclic nitrogen compounds and residual acid levels, and a first extract phase comprising hydrocarbons, water and acid having a substantial content of basic heterocyclic nitrogen compounds, (c) contacting said first extract phase with a hydrocarbon solvent which is substantially immiscible with said first extract phase at extraction conditions in a second contacting zone, and (e) separating the product of step (c) into a hydrocarbon recovery stream comprising the immiscible hydrocarbon solvent and oil-derived hydrocarbons having a lean content of basic heterocyclic nitrogen compounds and a second extract phase comprising acid, water and a decreased amount of nitrogen-free hydrocarbons and having a high content of basic heterocyclic nitrogen compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.