2009
DOI: 10.1080/10916460802112209
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Abstract: Naphthenic acids were separated from highly acidic Penglai crude oil by aqueous alkaline solution and analyzed by infrared spectrum (IR) and mass spectrum (MS). According to our results, the solution was composed of ethanolamine, alcohol, and water, the ratio being 0.1:7.9:10. When the solution and crude oil (ratio 0.4:1) were stirred at the speed of 300-400 r/min at 50 ı C for at least 10 min, more than 70% of the naphthenic acids in the crude oil could be removed. IR and MS results confirmed the presence of … Show more

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Cited by 8 publications
(5 citation statements)
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“…Column chromatography can separate crude oil into fractions based on different polarities. However, polarity-based fractionation techniques, such as saturates, aromatics, resins, and asphaltenes (SARA) separations, yield a fraction that is enriched in not only NAP acids but also other polar crude oil compounds. Liquid–liquid extractions with caustic water/ethanol mixtures are more discriminatory and predominately isolate acidic species but tend to isolate low molecular weight/water-soluble acids. Ionic liquids have also been employed to isolate acids from crude oil, but accomplish only 67% removal of NAP acids .…”
Section: Introductionmentioning
confidence: 99%
“…Column chromatography can separate crude oil into fractions based on different polarities. However, polarity-based fractionation techniques, such as saturates, aromatics, resins, and asphaltenes (SARA) separations, yield a fraction that is enriched in not only NAP acids but also other polar crude oil compounds. Liquid–liquid extractions with caustic water/ethanol mixtures are more discriminatory and predominately isolate acidic species but tend to isolate low molecular weight/water-soluble acids. Ionic liquids have also been employed to isolate acids from crude oil, but accomplish only 67% removal of NAP acids .…”
Section: Introductionmentioning
confidence: 99%
“…The naphthenic acids (RCOOH) used in this study were extracted from heavy oil using the method in the literature [35]. First, an alkaline aqueous solution was prepared by homogeneously mixing ethanolamine, ethyl alcohol, and water with a volume ratio of 1:79:100.…”
Section: Extraction Of the Rcooh From Heavy Oilmentioning
confidence: 99%
“…High acid crude oils (HACs) are defined as crude oils that have Total Acid Number (TAN) of more than 0.5 mg KOHg -1 oil and can go up to 8.00 mg KOHg -1 oil [1][2][3][4][5]. Total Acid Number (TAN) refers to the content of organic or inorganic acids presents in the crude oil and commonly defined as the amount of potassium hydroxide (KOH) in milligrams required to neutralize one gram of crude oil [6,7].…”
Section: Introductionmentioning
confidence: 99%