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Chinese Journal of Chemical Engineering 2020年第3期28卷 871-880页

作者： Qianxia Chen Xianghong Lu Jianbing Ji Biodiesel Laboratory of China Petroleum and Chemical Industry Federation Zhejiang Province Key Laboratory of BiofuelCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014China

A novel silver-based dihydric alcohol extractant was substituted for ionic liquids to enrich methyl linolenate(C18-3)from tallow seed oil methyl ester in this *** interactions among dihydric alcohol,Ag(I)and C18-3 were explored by FT-IR *** effects of dihydric alcohol structure,carrier Ag(I)concentration,temperature and initial feed concentration on extraction yield and selectivity were *** good extraction performance was achieved by 1,4-butanediol containing *** complexation of Ag(I)with C18-3 was dominant in extraction operation rather than physical ***,a multi-step reverse extraction method was proposed to obtain C18-3 product and regenerate the extractant.1-Hexene as the stripping phase can facilitate C18-3 reverse *** content of C18-3 in the product was up to 93.36%,and the yield was 73.76%.This work opened a new route for the utilization of the dihydric alcohol properties to manipulate the carrier efficiency for extracting unsaturated fatty acid methyl esters at a lower cost.

关键词： liquid–liquid extraction Dihydric alcohol Complexation AgBF4 Reverse extraction

Study on liquid–liquid two-phase mass transfer characteristics in the microchannel with deformed insert

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Chinese Journal of Chemical Engineering 2023年第2期54卷 114-126页

作者： Qinyan Wang Yang Jin Jun Li Yongbo Zhou Ming Chen Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources School of Chemical EngineeringSichuan UniversityChengdu 610065China

In this work, the liquid-liquid two-phase mass transfer characteristics in the microchannel with deformed insert were studied. The experiment used di-(2-ethylhexyl) phosphoric acid/kerosene-Cu^(2+)as the mass transfer evaluation system. The effects of some key factors such as the total flow velocity,channel inner diameter, channel length, insert diameter, extractant concentration on the extraction efficiency and mass transfer coefficient were systematically investigated. Compared with a simple microreactor, the liquid-liquid mass transfer enhancement effect of the insert was quantitatively analyzed. The study found that the regular deformation of the insert could cause fluid interface deformation and promote flow state chaos, effectively increasing the mass transfer rate. And the enhancement effect of the insert was more significant at high flow velocities. The highest mass transfer coefficient in the microchannel with deformed insert was 7.886 s^(-1), the enhancement factor could reach 4.17. And only needed 0.095 s to approach the extraction equilibrium. The deformed center insert exhibited an effective liquid-liquid mass transfer enhancement effect, which can be used as a micro-chemical process enhancement method to be applied in the fields of higher throughput mass transfer and chemical synthesis,and at the same time provide ideas for development and structural optimization of microreactors.

关键词： Microchannel Insert Deformation liquid–liquid extraction Mass transfer enhancement

N-Nitrosamine formation from chloramination of two common ionic liquids

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Journal of Environmental Sciences 2020年第1期32卷 341-348页

作者： Ian J.Vander Meulen Ping Jiang Di Wu Steve E.Hrudey Xing-Fang Li Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyFaculty of Medicine and DentistryUniversity of Alberta

Ionic liquids(ILs)are a class of solvents increasingly used as"green chemicals."Widespread applications of ILs have led to concerns about their accidental entry to the *** have been assessed for some environmental impacts;however,little has been done to characterize their potential impacts on drinking water if ILs accidentally enter surface *** cations are often aromatic or alkyl quaternary amines that resemble structures of previously confirmed N-nitrosamine(NA)***,this study has evaluated two common ILs,1-ethyl-3-methylimidazolium bromide(EMIm Br)and 1-ethyl-1-methylpyrrolidinium bromide(EMPyr Br),for their NA formation *** IL species was reacted with pre-formed monochloramine under various laboratory *** reaction mixtures were extracted using liquid–liquid extraction and analyzed for NAs using high performance liquid chromatography tandem mass *** low concentration of IL(250μmol/L),the yields of NAs(NMEA or NPyr)increased with increasing doses of monochloramine from both IL *** total NA yield was as high as 2.5±0.3 ng/mg from EMIm Br,and as high as 8.6±0.8 ng/mg from EMPyr *** high concentration of IL(5 mmol/L),the NA yield reached a maximum at 2.5 mmol/L NH2Cl,and then decreased with subsequent increases in the reactant concentrations,demonstrating ILs’solvent *** study re-emphasizes the importance of preventing discharge of ILs to water bodies to prevent secondary impacts on drinking water.

关键词： Ionic liquids N-nitrosamine liquid–liquid extraction HPLC–MS/MS DBPs

Determination of 20(S)-protopanaxadiol in human plasma by HPLC–MS/MS:application to a pharmacokinetic study

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Acta Pharmaceutica Sinica B 2013年第6期3卷 385-391页

作者： Feifan Xie Sanwang Li Zeneng Cheng Xingling Liu Hong Zhang Peijiong Li Zhi Liu Xin Guo Peng Yu School of Pharmaceutical Sciences Central South UniversityChangsha 410013China Hunan Tiger-Xiangya R&D Company Ltd. Changsha 410013China

A rapid,specific and sensitive HPLC-MS/MS method was developed and validated for the determination of 20(S)-protopanaxadiol(PPD)in human *** and the internal standard PD were extracted from plasma by liquid-liquid extraction with cyclohexane-methylene dichloride(2:1,v/v).The separation was performed on a HyPURIYTY C18 column using methanol-5 mM ammonium formate(90:10,v/v)as mobile phase at a flow rate of 0.35 mL/*** spectrometric detection was carried out by electrospray ionization(ESI)in the positive ion mode using multiple reaction monitoring(MRM).The monitored transitions were m/z 425.4-217.2 for PPD and at m/z 461.4-425.5 for *** method was linear over the range 0.512-100 ng/mL with a lower limit of quantification(LLOQ)of 0.512 ng/*** mean extraction recovery of PPD was greater than 78.2%and no significant matrix effect was *** intra-and inter-day precisions were less than 10%and the biases below 4%for *** validated method was applied to a three-level single-dose clinical pharmacokinetics study of 12 healthy Chinese volunteers and the main pharmacokinetic parameters of PPD were obtained.

关键词： 20(S)-Protopanaxadiol HPLC–MS/MS Human plasma Pharmacokinetics liquid–liquid extraction

Kinetic study on reactive extraction of phenylalanine enantiomers with BINAP-copper complexes

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Chinese Journal of Chemical Engineering 2015年第1期23卷 57-63页

作者：唐课文罗菁菁张盼良易健民华杰杨长安 Department of Chemistry and Chemical Engineering Hunan Institute of Science and Technology College of Chemistry Xiangtan University

Enantioselective liquid–liquid extraction has attracted considerable attention for its potential use in largescale production. Kinetic data are needed for the reliable scale-up of the process. This paper reports the kinetic study of reactive extraction of phenylalanine(Phe) enantiomers with BINAP–copper complex(BINAP–Cu) as a chiral selector. The theory of extraction accompanied by a chemical reaction was *** effects of agitation speed, interfacial area, p H value of aqueous phase, initial concentration of Phe enantiomers and initial concentration of BINAP–Cu on the specific rate of extraction were investigated. The forward rate constants of the reactions in the reactive extraction process are 7.93 × 10-5m5/2·mol-1/2·s-1for D-Phe and 1.29 × 10-4m5/2·mol-1/2·s-1for L-Phe.

关键词： Kinetics Amino acids Modeling liquid–liquid extraction Enantiomers