关键词: 原油, 环烷酸, 石油酸, 抽提, 乙醇胺

Abstract: The process for extracting naphthenic acids (NA) from crude oil was proposed. In order to extract naphthenic acids from crude oil, a combined solvent system comprised of ethanolamine, ethanol, Na2SO4 and UD10 in certain critical proportions was used to facilitate selective extraction and easy separation. The optimum constituents of the solvent system are: ethanolamine 10%(w), ethanol 35%(w), Na2SO4 2%(w), and UD10 100×10-6. The optimum ratio of solvent to oil is 0.3~0.5. Other extraction factors including extraction temperature, blender rotational speed, phase splitting time and reaction time were also discussed in details. Experimental results indicated that the method could efficiently prevent the problems of emulsification and high loss of oil aroused in the process of alkaline treatment or the high ratio of solvent/oil and large amount of solvent recycling in the process of ammonium treatment. More than 70% of the petroleum acids could be removed. The purity of NA was qualified enough to be used in industry. In addition, the extraction process is suitable for separating not only whole crude oil, but also its certain fractions.

Key words: crude oil, petroleum, naphthenic acid, extraction, ethanolamine