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题名: Liquid-liquid extraction process of amino acids by a new amide-based functionalized ionic liquid
作者: Li Huaxi1;  Li Zhuo1, 2;  Yin Jingmei1;  Li Changping1;  Chi Yansheng3;  Liu Qingshan3;  Zhang Xiuling1;  Urs, Welz-Biermann3
刊名: GREEN CHEMISTRY
发表日期: 2012
DOI: 10.1039/c2gc16560k
卷: 14, 期:6, 页:1721-1727
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: The cost of separation and purification of amino acids accounts for more than 80% of their total production expenditure. Thus, investigation into new separation technology is of great importance. In this paper, a new hydrophobic amide-based functionalized ionic liquid ([EimCH(2)CONHBu]NTf2) was designed and synthesized for the extraction of amino acids. From the preliminary experiments we found that the ionic liquid has a special selectivity for tryptophan (Trp) when pH = 0.5, and that its partition coefficient (P-IL/W) can reach up to 10.02. Subsequently, important factors that affect the extraction process by [EimCH(2)CONHBu]NTf2 were studied systematically. It was found that the extraction equilibrium could be achieved in 30 min. It was found that pH influences the P-IL/W greatly; the smaller the pH value, the higher the P-IL/W. When pH > pK(2), the P-IL/W is close to zero. With the increase of the volume ratio of the ionic liquid, extraction efficiency increases, while the P-IL/W decreases. As for the effect of the initial concentration (C-0) of tryptophan, P-IL/W decreases with an increase of C-0 when [EimCH(2)CONHBu]NTf2 is used as the extractant. From the investigation of the effect of temperature if was found that the extraction process of amino acid by functionalized ionic liquids is exothermic. Experiments on the recycling and reuse of [EimCH(2)CONHBu]NTf2 were also performed, and it was found that the extraction efficiency of [EimCH(2)CONHBu]NTf2 does not change after four cycles. Finally, the mechanisms were probed and the results show that the hydrogen bond formed between the acetyl group of the ionic liquid and the NH2 group of tryptophan accounts for the higher extraction efficiency.
关键词[WOS]: REACTIVE EXTRACTION ;  DESULFURIZATION ;  WATER ;  TRYPTOPHAN ;  SOLVENTS ;  RECOVERY ;  FUTURE ;  MEDIA
语种: 英语
WOS记录号: WOS:000304558500024
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143015
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Univ, Coll Chem Engn & Environm, Dalian, Peoples R China
2.Dalian Ocean Univ, Sch Sci, Dalian, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, China Ion Liquid Lab, Dalian, Peoples R China

Recommended Citation:
Li Huaxi,Li Zhuo,Yin Jingmei,et al. Liquid-liquid extraction process of amino acids by a new amide-based functionalized ionic liquid[J]. GREEN CHEMISTRY,2012,14(6):1721-1727.
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