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Extraction Behavior of Indole from Simulated Wash Oil Using Halogen-Free Ionic Liquids

[Image: see text] Indole is an important raw material in the chemical industry, and more than 1 wt % indole is contained in wash oil. Therefore, the extraction of indole from wash oil is of much importance. The conventional separation methods generally cost much money, pollute the environment, and c...

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Autores principales: Yang, Yufeng, Liu, Qing, Chen, Aibing, Ji, Youan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8246705/
https://www.ncbi.nlm.nih.gov/pubmed/34235334
http://dx.doi.org/10.1021/acsomega.1c02052
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author Yang, Yufeng
Liu, Qing
Chen, Aibing
Ji, Youan
author_facet Yang, Yufeng
Liu, Qing
Chen, Aibing
Ji, Youan
author_sort Yang, Yufeng
collection PubMed
description [Image: see text] Indole is an important raw material in the chemical industry, and more than 1 wt % indole is contained in wash oil. Therefore, the extraction of indole from wash oil is of much importance. The conventional separation methods generally cost much money, pollute the environment, and corrode the metallic devices due to the use of large amounts of inorganic acid and alkali solutions, and therefore, new methods should be proposed. In this work, a solvent extraction process for separating indole from simulated wash oil by five halogen-free ionic liquids (HFILs) has been designed, and the extraction behavior of indole has been evaluated. All the studied HFILs presented excellent extraction behavior for indole, and the whole separation process took no more than 5 min. For the same HFIL, the minimum residual indole contents remained the same, even if the initial indole contents changed. Among the HFILs, 1-butyl-3-methylimidazolium dimethyl phosphate ([Bmim][DMP]) has attracted more attention than other HFILs. The results showed that [Bmim][DMP] could extract over 96.9 wt % indole from the simulated wash oil, and the minimum residual indole content was as low as 2.1 g/dm(3). For indole, [Bmim][DMP] presented a maximum distribution coefficient of 201, which was much improved compared to other methods. The HFILs could be regenerated by using diethyl ether with ease. The regenerated HFILs could be reused, and the extraction behavior remained the same as the original HFILs. Based on FT-IR results, a mechanism of hydrogen bonds forming between HFILs and indole was proposed. In addition, the superiorities of HFILs over other separation agents in reusability, amounts needed, distribution coefficient for indole, and chemical structure were proved by comparison.
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spelling pubmed-82467052021-07-06 Extraction Behavior of Indole from Simulated Wash Oil Using Halogen-Free Ionic Liquids Yang, Yufeng Liu, Qing Chen, Aibing Ji, Youan ACS Omega [Image: see text] Indole is an important raw material in the chemical industry, and more than 1 wt % indole is contained in wash oil. Therefore, the extraction of indole from wash oil is of much importance. The conventional separation methods generally cost much money, pollute the environment, and corrode the metallic devices due to the use of large amounts of inorganic acid and alkali solutions, and therefore, new methods should be proposed. In this work, a solvent extraction process for separating indole from simulated wash oil by five halogen-free ionic liquids (HFILs) has been designed, and the extraction behavior of indole has been evaluated. All the studied HFILs presented excellent extraction behavior for indole, and the whole separation process took no more than 5 min. For the same HFIL, the minimum residual indole contents remained the same, even if the initial indole contents changed. Among the HFILs, 1-butyl-3-methylimidazolium dimethyl phosphate ([Bmim][DMP]) has attracted more attention than other HFILs. The results showed that [Bmim][DMP] could extract over 96.9 wt % indole from the simulated wash oil, and the minimum residual indole content was as low as 2.1 g/dm(3). For indole, [Bmim][DMP] presented a maximum distribution coefficient of 201, which was much improved compared to other methods. The HFILs could be regenerated by using diethyl ether with ease. The regenerated HFILs could be reused, and the extraction behavior remained the same as the original HFILs. Based on FT-IR results, a mechanism of hydrogen bonds forming between HFILs and indole was proposed. In addition, the superiorities of HFILs over other separation agents in reusability, amounts needed, distribution coefficient for indole, and chemical structure were proved by comparison. American Chemical Society 2021-06-14 /pmc/articles/PMC8246705/ /pubmed/34235334 http://dx.doi.org/10.1021/acsomega.1c02052 Text en © 2021 The Authors. Published by American Chemical Society Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Yang, Yufeng
Liu, Qing
Chen, Aibing
Ji, Youan
Extraction Behavior of Indole from Simulated Wash Oil Using Halogen-Free Ionic Liquids
title Extraction Behavior of Indole from Simulated Wash Oil Using Halogen-Free Ionic Liquids
title_full Extraction Behavior of Indole from Simulated Wash Oil Using Halogen-Free Ionic Liquids
title_fullStr Extraction Behavior of Indole from Simulated Wash Oil Using Halogen-Free Ionic Liquids
title_full_unstemmed Extraction Behavior of Indole from Simulated Wash Oil Using Halogen-Free Ionic Liquids
title_short Extraction Behavior of Indole from Simulated Wash Oil Using Halogen-Free Ionic Liquids
title_sort extraction behavior of indole from simulated wash oil using halogen-free ionic liquids
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8246705/
https://www.ncbi.nlm.nih.gov/pubmed/34235334
http://dx.doi.org/10.1021/acsomega.1c02052
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