苏丹高酸值重质原油脱酸新工艺探索

Process for Separation of Naphthenic Acids from High TAN Heavy Crude Oil of Sudan

采用醇、胺等复合溶剂,对高酸值原油中的环烷酸进行抽提,详细讨论了抽提温度、搅拌速度、相分离时间及反应时间等因素对脱酸的影响.实验结果表明,该方法有效地克服了乳化现象严重的缺点,经复合溶剂抽提,一次脱酸率可达70%以上.

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%(ω), ethanol 35%(ω), Na2SO4 2%(ω), 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.