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为了提高润滑油的质量 ,必须对其进行溶剂萃取脱氮精制处理。用改进的溶解度参数法在不同温度下定量估算萃取溶剂对溶质的溶解能力和选择性 ,并进行排序 ,结果表明溶剂的溶解能力与选择性是互相矛盾的。其中溶解能力与选择性可用无限稀释活度系数表示 ,而无限稀释活度系数用Helpinstill-Van Winkle推算法计算。选择五种溶剂对减压侧线油进行萃取实验并测定溶剂对油品中碱氮化合物的萃取效果 ,结果表明 ,理论估算结果与实验测定结果基本吻合。兼顾溶剂对碱氮化合物的溶解能力与选择性 ,在五种溶剂中BMA是性能较优的油品脱碱氮溶剂
In order to improve the quality of lubricating oil, it must be solvent extraction and denitrification. Solubility and selectivity of solute extracted by solvent were quantitatively estimated at different temperatures by the improved solubility parameter method. The results showed that the solvency and selectivity of solvent were contradictory to each other. Solubility and selectivity were expressed as infinite dilution activity coefficients, while infinite dilution activity coefficients were calculated using the Helpinstill-Van Winkle method. Five kinds of solvents were selected to conduct the extraction experiments on the depressurized sideline oil and the extraction effect of the solvent on the extraction of alkaline nitrogen compounds in the oil. The results show that the theoretical estimation results are in good agreement with the experimental results. Taking into account the solvency and selectivity of the solvent for the basic nitrogen compounds, BMA is the best performance oil-derived nitrogen-removing nitrogen solvent among the five solvents