Method for the improvement of the oxidation resistance of hydrocarbon oil, especially transformer oils by the selective removal of pro-oxidant nitrogen and sulfur compounds therefrom

Patent · Tue Feb 07 04:00:00 EST 1984

OSTI ID:6767505

Felsky, G

Liquid hydrocarbon streams, preferably petroleum streams, most preferably lube and specialty oil streams and in particular transformer oils are rendered resistant to oxidation by treatment with a silver salt impregnated adsorbent, preferably silver nitrate impregnated alumina by the process of contacting the hydrocarbon oil stream with the silver salt impregnated adsorbent and recovering a hydrocarbon stream of reduced pro-oxidant heteroatom compound (nitrogen compound and sulfur compound) content. The silver salt impregnated adsorbent is regenerated by sequential washing with portions of aromatic solvent and polar solvent. The aromatic solvent strips aromatic sulfides from the adsorbent. This fraction may be recombined with the hydrocarbon stream, especially in the case of transformer oils, so as to enhance the oxidation stability/resistance of the oil. The polar solvent, such as 3% methanol in toluene, strips the aliphatic sulfides from the adsorbent. The regenerated column is then ready for reuse.

• Assignee: Exxon Research and Engineering Co.
• Patent Number(s): US 4430205
• OSTI ID: 6767505
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020500* -- Petroleum-- Products & By-Products
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DENITRIFICATION
DESULFURIZATION
INSULATING OILS
NITRATES
NITROGEN COMPOUNDS
OILS
ORGANIC COMPOUNDS
ORGANIC SOLVENTS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
REGENERATION
SILVER COMPOUNDS
SILVER NITRATES
SOLVENTS
SORPTIVE PROPERTIES
STABILITY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS