Using dialkyl amide via forming hydrophobic deep eutectic solvents to separate citric acid from fermentation broth,Green Chemistry

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Using dialkyl amide via forming hydrophobic deep eutectic solvents to separate citric acid from fermentation broth
Green Chemistry ( IF 9.3 ) Pub Date : 2020-03-25 , DOI: 10.1039/c9gc04401a
Lijuan Liu _{1,

2,

3,

4,

5} , Qifeng Wei _{1,

2,

3,

4,

5} , Yong Zhou _{4,

6,

7,

8} , Xiulian Ren _{1,

2,

3,

4,

5}

Affiliation

Nowadays, developing appropriate technology is one of the biggest challenges for society to reduce environmental impact. In this research, to avoid the traditional calcium salt method which produces a large amount of waste gypsum residue, a new way of separating citric acid from fermentation broth was developed by forming hydrophobic deep eutectic solvents (DESs), in which amide and citric acid were used as the hydrogen bond acceptor and donor respectively when amide was in contact with the fermentation broth containing citric acid. Among these amides, C₁₀H₂₁NO was found to be an efficient hydrogen bond acceptor forming hydrophobic DESs with the citric acid based on the molecular size and shape and has the largest hydrophobic equilibrium constant of 3.14. The hydrophobic DES formation mechanism was studied by analyzing the chemical bonds using FT-IR and quantum chemical (QC) calculations. C₁₀H₂₁NO was regenerated by elevating the temperature of the hydrophobic DESs. The regenerated C₁₀H₂₁NO exhibited good recycling properties with no obvious reduction of the ability to form hydrophobic DESs. This effective way of obtaining high-quality citric acids provides new ideas for the separation of other carboxylic acids.

中文翻译：

通过形成疏水性深共熔溶剂使用二烷基酰胺从发酵液中分离柠檬酸

如今，开发适当的技术是社会减少环境影响的最大挑战之一。在这项研究中，为避免传统的钙盐方法产生大量的石膏废渣，通过形成疏水性深共熔溶剂（DESs）（其中酰胺和柠檬酸为二氯乙烷），开发了一种从发酵液中分离柠檬酸的新方法。当酰胺与含柠檬酸的发酵液接触时，分别用作氢键受体和供体。在这些酰胺中，C ₁₀ H ₂₁根据分子大小和形状，发现NO是与柠檬酸形成疏水性DES的有效氢键受体，其最大疏水平衡常数为3.14。通过使用FT-IR和量子化学（QC）计算分析化学键，研究了疏水性DES的形成机理。通过升高疏水性DES的温度来再生C ₁₀ H ₂₁ NO。再生的C ₁₀ H ₂₁ NO表现出良好的再循环特性，而形成疏水性DES的能力没有明显降低。这种获得高质量柠檬酸的有效方法为分离其他羧酸提供了新思路。

更新日期：2020-03-25

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