Mineral oils: processes and products – Refining – Nitrogen contaminant removal
Patent
1989-10-06
1990-10-02
Myers, Helane
Mineral oils: processes and products
Refining
Nitrogen contaminant removal
208177, C10G 1704
Patent
active
049605070
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.
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Chemical Engineering, Desai, Asim and Madgavkar, Aug. 1983.
Blytas George C.
Evans Wayne E.
McCollough Pamela J.
Myers Helane
Shell Oil Company
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