Two-step heterocyclic nitrogen extraction from petroleum oils
US4960508A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1989 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Jan 30, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for the removal of basic heterocyclic nitrogen compounds from petroleum oils which comprises: PA1 (a) contacting said petroleum oils containing basic heterocyclic nitrogen compounds with an aqueous solution of a first solvent comprising concentrated acid at extraction conditions in a first extract zone, PA1 (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, PA1 (c) flashing said first extract phase to remove bulk first solvent. PA1 (d) contacting said flashed first extract stream with an aqueous solution of a second solvent comprising a dilute acid in a second extraction zone, and PA1 (e) separating the product of step (d) into a recovery stream comprising hydrocarbons having a lean content of basic heterocyclic nitrogen compounds and a second extract phase comprising acid, water and a decreased amount of hydrocarbons and having a high content of basic heterocyclic nitrogen compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.