Mineral oils: processes and products – Refining – Sulfur removal
Patent
1983-06-13
1984-02-07
Gantz, Delbert E.
Mineral oils: processes and products
Refining
Sulfur removal
208254R, 208237, 208 14, 585843, C10G 2908
Patent
active
044302053
ABSTRACT:
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 absorbent. The regenerated column is then ready for reuse.
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Allocca Joseph J.
Exxon Research and Engineering Company
Gantz Delbert E.
McFarlane Anthony
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