Abstract: The desulfurization of oils using oxidation-extraction process does not need expensive equipment and the process is short. To solve the problems that the oxidation reaction rate is low and the quantity of oxidant is large, a new method is proposed to improve the reaction and mass transfer performance by adding a surfactant at a little amount into the reaction systems. A model system of dibenzothiophene DBT/octane, and oil products from a petrochemical company were taken as the working system respectively, with hydrogen peroxide as oxidant, phosphotungstic acid as oxidation catalyst, and acetonitrile/water azeotropic mixture as extractant. For the model system, the reaction time decreased from 24 h to 7 h at 50℃ by adding the surfactant of hexadecyltrimethyl ammonium bromide (CTAB) into the reaction systems, and the sulfur content was detected to be below 10′10-6 after only oxidation process. For light oils and diesel oils, the H2O2:oil volume ratio in the oxidation reaction could decrease from 1:1 to 1:25. The quantity of oxidant H2O2 decreased significantly, and the desulfurization rate after single-stage oxidation-extraction was above 50%, which was much higher than that of multi-stage extractions without oxidation.

Key words: desulfurization, oxidation, extraction, gasoline, diesel oil

摘要： 氧化萃取脱硫过程具有工艺流程简单、设备投资少等优点. 针对氧化过程中存在的反应速度慢、氧化剂用量多等缺点，提出了向反应体系中加入少量水溶性的表面活性剂以提高油水接触几率、强化氧化过程的新思路. 以二苯并噻吩-辛烷为模拟体系，磷钨酸为催化剂，双氧水为氧化剂，通过添加十六烷基三甲基溴化铵，在50℃下可使氧化时间从24 h缩短到7 h，且氧化后油品中硫含量低于10′10-6. 对于实际汽、柴油体系，通过添加表面活性剂，氧化过程中油水相比可从1:1降低为25:1，大大减少了氧化剂用量，且氧化后萃取的单级脱硫率大于50%，优于直接萃取过程的脱硫率.

关键词: 脱硫, 氧化, 萃取, 汽油, 柴油