Abstract
More and more acidic crude oil has been exploited in the world. The presence of naphthenic acids in crude oil has a great influence on petroleum refiners. A new method was introduced to separate naphthenic acids from Beijiang highly acidic crude oil in this paper. The 2-methylimidazole solution in ethanol was used as the acid-removal reagent by mixing with the crude oil and then allowing the two phases to separate, with the naphthenic acids being extracted from the crude oil. Data indicated that the optimal content of 2-methylimidazole in ethanol was 20% (w/w) and the optimal extraction time was 10 min, with the reagent/oil ratio being 0.4:1 (w/w). The suitable reaction temperature could be room temperature. The total acid number of the crude oil was lowered from 4.18 to 1.38 mg of KOH/g, and the acid-removal rate could reach up to 67.0%.
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