Study on the phase behaviors fatty acid-polyether amine-carbon dioxide complex solvent and its extracting ability

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Abstract The CO₂-triggered phase separation behaviors,switching performance and efficiency of extracting copper ions from aqueous solutions for fatty acid-polyetheramide-water complex solvents were investigated. A series of switchable solvents were constructed by pairing three types of hydrophobic low eutectic solvents DES,caprylic acid-decanoic acid,capric acid-lauric acid and decanoic acid-lauric acid with polyetheramine D230 aqueous solution. The CO₂-triggered response performance of different fatty acids with different concentrations of polyetheramine D230 aqueous solution to form homogeneous solutions was investigated,respectively. It was found that the shuttling back and forth of the polarity of the complex solvents exhibited different phase behaviors for 10%,13% and 15% aqueous polyetheramine D230 solutions. With the aid of a fatty acid-polyetheramine-water complex solvent,an extraction mode was achieved for the homogeneous extraction of copper ions from aqueous solutions by fatty acid DES and afterward the heterogeneous separation from the aqueous phase. The experimental results showed that the combination of 10% polyetheramine D230 aqueous solution with fatty acids had good CO₂-switching phase behaviour and the capric acid-lauric acid DES exhibited a best performance of extracting copper ions. The extraction ratio of copper ions reached 92.7%.

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	HAN Guiqiang
	LI Min
	LI Tian
	MENG Xianghao
	FENG Shubo

Keywords： fatty acid polyether amine CO₂ responsiveness hydrophobic deep eutectic solvent homogeneous phase extraction heterogeneous phase separation copper ions

Received 2021-11-05;

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HAN Guiqiang, LI Min, LI Tian, MENG Xianghao, FENG Shubo.Study on the phase behaviors fatty acid-polyether amine-carbon dioxide complex solvent and its extracting ability[J] Chemcial Industry and Engineering, 2022,V39(6): 62-68

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