Wang Guibin, Liu Lijuan, He Yanlong, Zhao Yu, Zhang Dongqiang
School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China.
Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou 730050, Gansu, China.
ACS Omega. 2025 May 19;10(21):21835-21845. doi: 10.1021/acsomega.5c01791. eCollection 2025 Jun 3.
In the ionic liquid desulfurization system, the repeated circulation and regeneration of the ionic liquid lead to the continuous accumulation of Cl, resulting in decreased desulfurization performance, increased ionic liquid loss, and exacerbated equipment corrosion. Therefore, the effective removal of Cl from the desulfurization of ionic liquids is of great significance. This paper discusses the use of modified 717 resin for the removal of Cl from a desulfurization ionic liquid. First, the adsorption equilibrium, adsorption thermodynamics, and adsorption kinetics of the modified 717 resin for Cl were studied. The adsorption isotherm conforms to the Langmuir model, with an adsorption enthalpy of 1.971 kJ mol, indicating that the process is a monolayer endothermic reaction. The adsorption kinetics follow a pseudo-second-order kinetic model, suggesting that the adsorption rate is controlled by chemical adsorption. Second, through dynamic adsorption experiments, it was determined that the optimal process parameters for Cl removal were: liquid flow rate of 2 mL/min, bed height of 10 cm, initial Cl concentration of 2300 mg/L, and reaction temperature of 45 °C. The dynamic behavior of the modified 717 resin in adsorbing Cl conforms to the Thomas model and the Yoon-Nelson model. Then, the equilibrium adsorption capacity of Cl of the modified 717 resin decreased by only 1.42 mg/g after five regeneration experiments, indicating that the resin has good renewability. Finally, the modified 717 resin removes Cl from the actual desulfurization ionic liquid with good results. This study provides a theoretical basis for the industrial application of ion exchange resins for the removal of Cl from desulfurization ionic liquids.
在离子液体脱硫系统中，离子液体的反复循环和再生导致Cl不断积累，造成脱硫性能下降、离子液体损失增加以及设备腐蚀加剧。因此，有效去除离子液体脱硫过程中的Cl具有重要意义。本文探讨了使用改性717树脂去除脱硫离子液体中的Cl。首先，研究了改性717树脂对Cl的吸附平衡、吸附热力学和吸附动力学。吸附等温线符合Langmuir模型，吸附焓为1.971 kJ/mol，表明该过程为单层吸热反应。吸附动力学遵循准二级动力学模型，表明吸附速率受化学吸附控制。其次，通过动态吸附实验确定了去除Cl的最佳工艺参数为：液体流速2 mL/min、床层高度10 cm、初始Cl浓度2300 mg/L、反应温度45℃。改性717树脂吸附Cl的动态行为符合Thomas模型和Yoon-Nelson模型。然后，经过五次再生实验后，改性717树脂对Cl的平衡吸附容量仅下降了1.42 mg/g，表明该树脂具有良好的可再生性。最后，改性717树脂对实际脱硫离子液体中的Cl去除效果良好。本研究为离子交换树脂用于去除脱硫离子液体中Cl的工业应用提供了理论依据。
