Abstract: RFCC diesel oil are refined to remove acidic components by solvent extraction technology. Furfural，DMF，DMSO，methanol and polyethylene glycol are selected to be used as single solvent. By comparison，the composite solvents are composed of furfural and DMF. And the best condition is determined as furfural/DMF ratio of 2 g/g，the solvent/waste oil ratio of 1 g/g under the contact time of 10 min，contact temperature of 35 ℃. The quality of RFCC diesel oil，refined by the composite solvents，meets the standards of diesel GB 252—2011 and its yield is 89.8%. Extraction by composite solvents，better than single solvent，can solve emulsification problem caused by alkaline washing diesel，greatly reduce the dosage of solvents，and reduce the costs with the recycle of composite solvents.

Key words: RFCC diesel oil, solvents, solvent extraction, polymers, aluminium chloride

摘要： 用溶剂萃取的方法对重油催化裂化柴油进行脱酸精制研究。首先用单一溶剂糠醛、N,N-二甲基甲酰胺、二甲基亚砜、甲醇、聚乙二醇进行脱酸效果对比并对溶剂进行筛选，然后考察了复合溶剂的脱酸效果，最终选定糠醛和N,N-二甲基甲酰胺为最佳复合溶剂。考察了复合溶剂配比、剂油比、萃取温度和萃取时间等因素对脱酸效果和精制油收率的影响，加入聚合氯化铝作为助剂可提高精制油收率。实验得到的最佳精制条件为：复合溶剂最优配比糠醛/N,N-二甲基甲酰胺为2 g/g、剂油比1 g/g、精制温度35 ℃、精制时间10 min、助剂加入量2.0%、静置时间15 min。结果表明，在最佳萃取条件下，得到产品酸度为4.2 mgKOH/100 mL符合普通柴油GB 252—2011的要求，且产品收率达到89.8%。复合溶剂萃取精制解决了柴油碱洗脱酸易乳化、单一溶剂萃取脱酸效果差的问题，同时大大降低了溶剂的使用量，并对复合溶剂进行回收利用，缩减了工艺成本。

关键词: 重油催化裂化柴油, 溶剂, 溶剂萃取, 聚合物, 氯化铝