Chen Xingrui, Zhang Yingying, Kang Yanhong
College of Chemistry and Chemical Engineering, Shenyang Normal University Shenyang 110034 China
College of Chemistry, Liaoning University Shenyang 110036 China
RSC Adv. 2025 Jun 2;15(23):18283-18291. doi: 10.1039/d5ra01724f. eCollection 2025 May 29.
The electro-polymerization desulfurization process is a promising technology for oil desulfurization. However, using ionic liquids as electrolytes for exploring deep desulfurization through the electro-polymerization method has not yet been well studied. In this study, four imidazole nitrate ionic liquids were successfully synthesized using a typical two-step method and characterized by H-NMR and TGA element analysis. Then, the electro-polymerization desulfurization experiment is conducted using thiophene as model oil and the ionic liquid [Cmim][NO] as electrolyte. The effects of the oil-agent ratio, electro-polymerization potential, temperature, and reaction time on the desulfurization rate were invested. The results showed that the maximum desulfurization rate of the ionic liquid [Cmim][NO] reached 68.7% under the optimal conditions: oil-agent ratio of 3 : 1 (mL), electro-polymerization potential of 2.5 V, temperature of 80 °C, and reaction time of 150 min. Moreover, the effects of temperature and reaction time on the desulfurization performance of the imidazole nitrate ionic liquid homologs [C mim][NO] ( = 2, 3, 6) were also explored. The results showed that extending the time or increasing the temperature can enhance desulfurization. Finally, the electrochemical desulfurization mechanism and the desulfurization performance of the real oil were further investigated, with a maximum desulfurization rate of 51.2%. The desulfurization rate of ionic liquid can reach 55.1% after five cycles. This study is of great significance for further study of electrochemical desulfurization and promoting clean oil production.
电聚合脱硫工艺是一种很有前景的油品脱硫技术。然而，使用离子液体作为电解质通过电聚合方法探索深度脱硫尚未得到充分研究。在本研究中，采用典型的两步法成功合成了四种咪唑硝酸盐离子液体，并通过 H-NMR 和 TGA 元素分析对其进行了表征。然后，以噻吩为模型油，离子液体[Cmim][NO]为电解质进行电聚合脱硫实验。考察了油剂比、电聚合电位、温度和反应时间对脱硫率的影响。结果表明，在最佳条件下：油剂比为 3∶1（mL）、电聚合电位为 2.5 V、温度为 80℃、反应时间为 150 min 时，离子液体[Cmim][NO]的最大脱硫率达到 68.7%。此外，还探讨了温度和反应时间对咪唑硝酸盐离子液体同系物[C mim][NO]（ = 2, 3, 6）脱硫性能的影响。结果表明，延长时间或提高温度均可增强脱硫效果。最后，进一步研究了电化学脱硫机理及实际油品的脱硫性能，最大脱硫率为 51.2%。离子液体经过五次循环后脱硫率可达 55.1%。本研究对于进一步开展电化学脱硫研究及推动清洁油品生产具有重要意义。
