| Orthogonal array design for the optimization of stripping Sr(Ⅱ) from ionic liquids using supercritical CO_2 |
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| 作者姓名： | Tao Yang Jing Fu Qingde Chen Xinghai Shen |
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| 作者单位： | Beijing National Laboratory for Molecular Sciences(BNLMS), Fundamental Science on Radiochemistry and Radiation Chemistry Laboratory, College of Chemistry and Molecular Engineering,;Peking University, Beijing 100871, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (91226112). |
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| 摘 要： | The strontium ions extracted from the aqueous phase into 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide(C_2mimNTf2) with dicyclohexyl-18-crown-6(DCH18C6) was stripped effectively by supercritical CO_2(sc-CO_2).Hexafluoroacetylacetone(HFAA)-acetonitrile was found to be an excellent modifier of sc-CO_2 to enhance the stripping efficiency.In the orthogonal array design(OAD),OA_(25)(5~5)matrix was employed to optimize the stripping of Sr(Ⅱ) from the DCH 18C6-C_2mimNTf_2 system.Effects of five experimental factors:temperature,pressure,concentration of HFAA,static and dynamic extraction times as well as each factor at five-levels on the stripping of Sr(Ⅱ) were optimized.The effects of these parameters were treated by the analysis of variance(ANOVA).The results showed that Sr(II) could be nearly 100%extracted from the IL phase at 308 K,30 MPa,40 min of dynamic extraction and 60 mmol·L~(-1) HFAA in acetonitrile,respectively.Finally,the stripping mechanism was studied by ESI-MS.
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| 关 键 词： | Supercritical CO2 stripping Ionic liquid Strontium Orthogonal array design |
| 收稿时间： | 20 March 2016 |
Orthogonal array design for the optimization of stripping Sr(Ⅱ) from ionic liquids using supercritical CO2 |
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| Tao Yang,Jing Fu,Qingde Chen,Xinghai Shen.Orthogonal array design for the optimization of stripping Sr(Ⅱ) from ionic liquids using supercritical CO2[J].Chinese Journal of Chemical Engineering,2017,25(1):26-31. |
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| Authors: | Tao Yang Jing Fu Qingde Chen Xinghai Shen |
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| Affiliation: | Beijing National Laboratory for Molecular Sciences(BNLMS), Fundamental Science on Radiochemistry and Radiation Chemistry Laboratory, College of Chemistry and Molecular Engineering,;Peking University, Beijing 100871, China |
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| Abstract: | The strontium ions extracted from the aqueous phase into 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mimNTf2) with dicyclohexyl-18-crown-6 (DCH18C6) was stripped effectively by supercritical CO2 (sc-CO2).Hexafluoroacetylacetone (HFAA)-acetonitrile was found to be an excellent modifier of sc-CO2 to enhance the stripping efficiency.In the orthogonal array design (OAD),OA25 (55) matrix was employed to optimize the stripping of Sr(Ⅱ) from the DCH18C6-C2mimNTf2 system.Effects of five experimental factors:temperature,pressure,concentration of HFAA,static and dynamic extraction times as well as each factor at five-levels on the stripping of Sr(Ⅱ) were optimized.The effects of these parameters were treated by the analysis of variance (ANOVA).The results showed that Sr(Ⅱ) could be nearly 100％ extracted from the IL phase at 308 K,30 MPa,40 min of dynamic extraction and 60 mmol· L-1 HFAA in acetonitrile,respectively.Finally,the stripping mechanism was studied by ESI-MS. |
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| Keywords: | Supercritical CO2 stripping Ionic liquid Strontium Orthogonal array design |
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