Deep eutectic solvents with multiple weak acid sites for highly efficient, reversible and selective absorption of ammonia

[Display omitted] •Novel DESs with more than two different weak acid sites were prepared.•The DESs exhibit quite high NH3 solubilities, especially at low pressures.•The absorption of NH3 is highly reversible, and selective towards N2 and H2.•Theoretical calculations and spectroscopic characterizatio...

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Published in:Separation and purification technology Vol. 269; p. 118791
Main Authors: Cheng, Ning-Ning, Li, Zi-Liang, Lan, Hong-Chao, Xu, Wen-Long, Jiang, Wen-Jing, Huang, Kuan, Peng, Hai-Long
Format: Journal Article
Language:English
Published: Elsevier B.V 15-08-2021
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Abstract [Display omitted] •Novel DESs with more than two different weak acid sites were prepared.•The DESs exhibit quite high NH3 solubilities, especially at low pressures.•The absorption of NH3 is highly reversible, and selective towards N2 and H2.•Theoretical calculations and spectroscopic characterizations were performed. Developing new NH3 separation technology is very meaningful for the environmental protection related to ammonia synthesis process. In this work, we found that ethylamine chloride (EaCl) can form deep eutectic solvents (DESs) with resorcinol (Res) and phloroglucinol (Phl). The chemical and physical properties of new DESs were determined first, because they are the basic data for DESs. Considering that such kinds of DESs have multiple weak acid sites, we systematically investigated the NH3 absorption performance of prepared DESs. We found that the prepared DESs show chemical absorption for NH3, with quite high NH3 solubilities, particularly at reduced pressures. Specifically, the solubilities of NH3 in prepared DESs reach 9.00 mol/kg at 313.2 K and 102.1 kPa, and 3.73 mol/kg at 313.2 K and 4.7 kPa. The prepared DESs also show highly reversible absorption for NH3, and selective absorption towards N2 and H2. The underlying mechanism of prepared DESs for NH3 absorption was finally investigated by theoretical calculations and spectroscopic characterizations.
AbstractList [Display omitted] •Novel DESs with more than two different weak acid sites were prepared.•The DESs exhibit quite high NH3 solubilities, especially at low pressures.•The absorption of NH3 is highly reversible, and selective towards N2 and H2.•Theoretical calculations and spectroscopic characterizations were performed. Developing new NH3 separation technology is very meaningful for the environmental protection related to ammonia synthesis process. In this work, we found that ethylamine chloride (EaCl) can form deep eutectic solvents (DESs) with resorcinol (Res) and phloroglucinol (Phl). The chemical and physical properties of new DESs were determined first, because they are the basic data for DESs. Considering that such kinds of DESs have multiple weak acid sites, we systematically investigated the NH3 absorption performance of prepared DESs. We found that the prepared DESs show chemical absorption for NH3, with quite high NH3 solubilities, particularly at reduced pressures. Specifically, the solubilities of NH3 in prepared DESs reach 9.00 mol/kg at 313.2 K and 102.1 kPa, and 3.73 mol/kg at 313.2 K and 4.7 kPa. The prepared DESs also show highly reversible absorption for NH3, and selective absorption towards N2 and H2. The underlying mechanism of prepared DESs for NH3 absorption was finally investigated by theoretical calculations and spectroscopic characterizations.
ArticleNumber 118791
Author Cheng, Ning-Ning
Lan, Hong-Chao
Xu, Wen-Long
Huang, Kuan
Peng, Hai-Long
Li, Zi-Liang
Jiang, Wen-Jing
Author_xml – sequence: 1
  givenname: Ning-Ning
  surname: Cheng
  fullname: Cheng, Ning-Ning
  organization: School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
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  givenname: Zi-Liang
  surname: Li
  fullname: Li, Zi-Liang
  organization: School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
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  givenname: Hong-Chao
  surname: Lan
  fullname: Lan, Hong-Chao
  organization: School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
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  givenname: Wen-Long
  surname: Xu
  fullname: Xu, Wen-Long
  organization: School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
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  givenname: Wen-Jing
  surname: Jiang
  fullname: Jiang, Wen-Jing
  organization: School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
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  givenname: Kuan
  surname: Huang
  fullname: Huang, Kuan
  email: huangk@fzu.edu.cn
  organization: National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), College of Chemical Engineering, Fuzhou University, Fuzhou, Fujian 350002, China
– sequence: 7
  givenname: Hai-Long
  surname: Peng
  fullname: Peng, Hai-Long
  email: penghailong@ncu.edu.cn
  organization: School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi 330031, China
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Keywords Weak acid site
Deep eutectic solvent
Ammonia synthesis
Chemical absorption
NH3 separation
Language English
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Snippet [Display omitted] •Novel DESs with more than two different weak acid sites were prepared.•The DESs exhibit quite high NH3 solubilities, especially at low...
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SubjectTerms Ammonia synthesis
Chemical absorption
Deep eutectic solvent
NH3 separation
Weak acid site
Title Deep eutectic solvents with multiple weak acid sites for highly efficient, reversible and selective absorption of ammonia
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