Two-step heterocyclic nitrogen extraction from petroleum oils
Patent
·
OSTI ID:6219502
This patent describes a process for the removal of basic heterocyclic nitrogen compounds from petroleum oils. It comprises: contacting the petroleum oils containing basic heterocyclic nitrogen compounds with an aqueous solution of a first solvent comprising concentrated acid at extraction conditions in a first extraction zone, separating the product 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, flashing the first extract phase to remove bulk first solvent, contacting the flashed first extract stream with an aqueous solution of a second solvent comprising a dilute acid at extraction conditions in a second extraction zone, and separating the product 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.
- Assignee:
- Shell Oil Co., Houston, TX (USA)
- Patent Number(s):
- US 4960508; A
- Application Number:
- PPN: US s 7-303334
- OSTI ID:
- 6219502
- Country of Publication:
- United States
- Language:
- English
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