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A method for upgrading an oil stream containing naphthenic acid and sulfur contaminants is described. In this method, an oil stream with naphthenic acid and sulfur contaminants is upgraded by the following steps. First, the oil stream is mixed with an alkaline earth metal oxide in an amount effectiv

A method for upgrading an oil stream containing naphthenic acid and sulfur contaminants is described. In this method, an oil stream with naphthenic acid and sulfur contaminants is upgraded by the following steps. First, the oil stream is mixed with an alkaline earth metal oxide in an amount effective to convert substantially all of the naphthenic acid contaminants to non-acidic compounds and alkaline earth metal carbonate and also to convert substantially all of the sulfur contaminants to alkaline earth metal sulfide. Then, the mixture is heated under a pressure sufficient to prevent vaporization of the mixture to a temperature sufficient and for a time sufficient to react the naphthenic acid contaminants with the alkaline earth oxide to form the corresponding non-acidic compounds and alkaline earth carbonates. In the meantime, substantially all of the sulfur contaminants react with the alkaline earth oxide to form the alkaline earth sulfide. After the desired reaction is complete, the alkaline earth carbonate and the alkaline earth sulfide is separated from the oil stream. Upgraded oil is thus obtained.

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[ What is claimed is:] [1.] A method for upgrading an oil stream containing acidic contaminants which comprises:adding an alkaline earth oxide to the oil stream at an effective amount to convert substantially all naphthenic acid contaminants to corresponding non-acidic compounds to form a mixture;he

[ What is claimed is:] [1.] A method for upgrading an oil stream containing acidic contaminants which comprises:adding an alkaline earth oxide to the oil stream at an effective amount to convert substantially all naphthenic acid contaminants to corresponding non-acidic compounds to form a mixture;heating the mixture under a pressure sufficient to prevent vaporization of the mixture to a temperature and for a time sufficient for the naphthenic acid contaminants to react with the alkaline earth oxide to form a mixture of petroleum for processing and an alkaline earth carbonate;separating the alkaline earth carbonate to recover the petroleum. [16.] A method for upgrading an oil stream containing naphthenic acid and sulfur contaminants which comprises:adding an alkaline earth metal oxide to the oil stream to form a mixture wherein said alkaline earth oxide is added at an effective amount to convert substantially all naphthenic acid contaminants to corresponding non-acidic compounds and substantially all sulfur contaminants to alkaline earth sulfide;heating the mixture under a pressure sufficient to prevent vaporization of the mixture to a temperature sufficient and for a time sufficient to react the naphthenic acid contaminants with the alkaline earth oxide to form the corresponding non-acidic compounds and alkaline earth carbonate and the sulfur contaminants with the alkaline earth oxide to form the alkaline earth sulfide;flashing the heated mixture into a lower pressure prior to separation; andseparating the alkaline earth carbonate and alkaline earth sulfide. The method of claim 16 wherein the alkaline earth oxide is selected from the group consisting of calcium oxide and barium oxide. The method of claim 17 wherein the alkaline earth oxide is calcium oxide. The method of claim 18 wherein the heating step involves heating the mixture to a temperature of at least 250.degree. C. and for a time of at least 5 minutes. [32.] A method for upgrading an oil stream containing naphthenic acid and sulfur contaminants which comprises:adding calcium oxide to the oil stream wherein said calcium oxide is added at an amount of from about 1.5 to about 2.0 times the total theoretical requirement for converting all carboxyl groups to CaCO.sub.3 and all sulfur to CaS;mixing the calcium oxide with the oil stream to form a well-mixed mixture;heating the mixture under a pressure sufficient to prevent vaporization of the mixture to a temperature of from about 250.degree. C. to about 500.degree. C. for a time of from about 5 minutes to about 15 minutes to react the naphthenic acid with the calcium oxide to form the corresponding non-acidic compounds and calcium carbonate and the sulfur contaminants with the calcium oxide to form calcium sulfide;separating the alkaline earth carbonate and calcium sulfide.