萃取法脱除模拟富硫油中的噻吩

中国已全面执行国V汽油标准，硫含量不大于10μg/g。传统加氢脱硫方法存在氢耗大、能耗高、噻吩不能有效利用等弊端。萃取脱硫技术因反应条件温和已成为研究热点。萃取脱硫的研究对象主要是催化汽油或模拟汽油，而对于萃取后回收富硫油萃取脱硫的研究在文献中尚未见报道。本文以模拟富硫油为原料，考察了单剂、复配剂、温度及剂油比对脱硫率、油损失率、剂损失率和选择性的影响。实验结果表明：（1）二甲基亚砜（DMSO）和环丁砜（SF）的单级脱硫率分别为53.51%和47.36%，但SF选择性高于DMSO，分别为1.13和1.04。（2）复配剂DMSO+10%MEA一级萃取脱硫率能达到49.59%，选择性系数为1.40，均高于SF，较之DMSO，脱硫率有小幅度的下降，但选择性系数从1.04增加到1.40，增加了25.71%。（3）复配剂50%SF+50%DMSO选择性系数为1.37，此时脱硫率可达50.92%，均高于SF的脱硫率和选择性系数，较DMSO，尽管脱硫率有小幅度的下降，但选择性系数从1.04增加到1.37，增加了31.73%。（4）在1.5:1的最佳溶剂油比下，DMSO+10%MEA的选择性系数和脱硫率略高于50%SF+50%DMSO。

Extractive Desulfurization from Simulated Naphtha Stock Containing Thiophene

The Motor Gasoline Standards of National V has been executed since January 1, 2017. The traditional hydrodesulfurization process has some disadvantages such as high hydrogen consumption, high energy consumption, and non recyclability of thiophene. Extractive desulfurization technology has become a research hotspot due to the mild operation conditions. Currently, the main research objects of extraction desulfurization are catalytic gasoline or simulated gasoline, but the extraction desulfurization for sulfur-rich oil obtanied by recycling raffinate has not been reported in literatures yet. In this paper, the effects of single agent, compound agent, temperature and ratio of agent to oil on desulfurization rate, oil loss rate, agent loss rate and selectivity coefficients were investigated. The experimental results showed that the thiophene existed in simulated sulfur-rich oil could be furtherly removed by extraction. The single-stage desulfurization rates of dimethyl sulfoxide (DMSO) and sulfolane sulfoxide (SF) were 53.51% and 47.36%, respectively, while 1.13 of selectivity coefficient of SF was higher than that of DMSO with 1.04. To complex solvent, 49.59% of single-stage desulfurization rate and 1.4034 of selectivity coefficient to DSMO+10%MEA were higher than that of SF. Compared to DMSO, Although the desulfurization rate of DSMO+10%MEA decreased slightly, the selectivity coefficient increased from 1.04 to 1.40 with 34.62% of growth rate. Secondly, 50.92% of single-stage desulfurization rate and 1.3709 of selectivity coefficient to 50%SF+50%DMSO were higher than that of SF. Compared to DMSO, although the desulfurization rate decreased a little, the selectivity coefficient increased from 1.04 to 1.37 with 31.73% of growth rate. Finally, the selectivity coefficient and desulfurization rate of DMSO+10% MEA were slightly higher than that of 50%SF+50%DMSO under the optimum solvent-oil ratio of 1.5:1.