High-efficiency separation and extraction of naphthenic acid from high acid oils using imidazolium carbonate ionic liquids

doi:10.1016/j.cjche.2021.12.012

Abstract

Abstract: N-alkyl imidazolium carbonate ionic liquids were employed to separate and recover naphthenic acid from model oils. The effects of the cationic and anionic structures of ionic liquids and operating conditions on the deacidification performance were investigated. The deacidification performance of traditional organic solvents was also investigated for comparison. The results indicated that the naphthenic acid could be completely removed from the model oil with a small mass ratio of ionic liquid to oil. The extracted naphthenic acid was regenerated with a recovery of up to 92%. In addition, imidazolium carbonate ionic liquids could be successfully regenerated and recycled. The mechanism of interaction between imidazole ionic liquids and the naphthenic acid molecules were explained by Gauss calculation.

Key words: Extraction, Ionic liquid, Naphthenic acid, Recovery, Computational chemistry

摘要： N-alkyl imidazolium carbonate ionic liquids were employed to separate and recover naphthenic acid from model oils. The effects of the cationic and anionic structures of ionic liquids and operating conditions on the deacidification performance were investigated. The deacidification performance of traditional organic solvents was also investigated for comparison. The results indicated that the naphthenic acid could be completely removed from the model oil with a small mass ratio of ionic liquid to oil. The extracted naphthenic acid was regenerated with a recovery of up to 92%. In addition, imidazolium carbonate ionic liquids could be successfully regenerated and recycled. The mechanism of interaction between imidazole ionic liquids and the naphthenic acid molecules were explained by Gauss calculation.

关键词: Extraction, Ionic liquid, Naphthenic acid, Recovery, Computational chemistry

Fenghua Geng, Rui Zhang, Luo Wu, Zheng Tang, Han Liu, Haiyan Liu, Zhichang Liu, Chunming Xu, Xianghai Meng. High-efficiency separation and extraction of naphthenic acid from high acid oils using imidazolium carbonate ionic liquids[J]. Chinese Journal of Chemical Engineering, 2022, 41(1): 252-259.

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