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A state-of-the-art review on single drop study in liquid–liquid extraction:Experiments and simulations

Chinese Journal of Chemical Engineering 2019年第12期27卷 2857-2875页

作者： Jiyizhe Zhang Yundong Wang geoffrey wstevens Weiyang Fei The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Department of Chemical Engineering The University of MelbourneParkvilleVictoria 3010Australia

The experimental and numerical investigations of single drop in liquid/liquid extraction system have been reviewed with particular focus on experimental techniques and computational fluid dynamic simulation *** surveys of available experimental techniques and numerical approaches for single drop rising and falling were ***,single drop mass transfer was also reviewed both experimentally and ***,single drop breakage and coalescence process and the influencing factors were summarized and compared,so as to establish sub-models for population balance *** directions on single drop mass transfer,drop breakage and coalescence were *** is believed that the single drop is a powerful tool to assist extraction process design from lab-scale to pilot-scale.

关键词： Solvent extraction Mass transfer Single drop Drop breakage and coalescence CFD simulation Population balance model

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Precipitation study of CO2-loaded glycinate solution with the introduction of ethanol as an antisolvent

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Frontiers of Chemical Science and Engineering 2020年第3期14卷 415-424页

作者： Siming Chen Yue Wu geoffrey wstevens Guoping Hu Wenshou Sun Kathryn AMumford College of Environmental Sciences and Engineering Qingdao UniversityQingdao 266071China Peter Cook Centre for Carbon Capture and Storage Research(PCC) Particulate Fluids Processing Centre(PFPC)Department of Chemical EngineeringUniversity of MelbourneParkvilleVictoria 3010Australia

Focused beam reflectance measurement(FBRM)and 13C nuclear magnetic resonance(13C NMR)analysis were used to study the precipitation process of CO2-loaded potassium glycinate(KGLY)solutions at different CO2 loadings,during the addition of ethanol as an antisolvent at a rate of 10 mL·min−*** volume ratio of ethanol added to the KGLY solution(3.0 mol·L−1,340 mL)ranged from 0 to *** solid-liquid-liquid phases were formed during the precipitation *** FBRM results showed that the number of particles formed increased with CO2 loading and ethanol addition for CO2-unsaturated KGLY solutions,whilst for CO2-saturated KGLY solution it first increased then decreased to a stable value with ethanol addition.13C NMR spectroscopic analysis showed that the crystals precipitated from the CO2-unsaturated KGLY solutions consisted of glycine only,and the quantity crystallised increased with CO2 loading and ethanol ***,a complex mixture containing glycine,carbamate and potassium bicarbonate was precipitated from CO2-saturated KGLY solution with the maximum precipitation percentages of 94.3%,31.4%and 89.6%,respectively,at the ethanol volume fractions of 1.6,2.5 and 2.3.

关键词： crystallization precipitation glycinate FBRM 13C NMR

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Efficient fixation of CO_(2) into propylene carbonate with [BMIM]Br in a continuous-flow microreaction system

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Green Energy & Environment 2021年第2期6卷 291-297页

作者： Yuxin Wu Yuncheng Ding Jianhong Xu Yundong Wang Kathryn Mumford geoffrey wstevens Weiyang Fei The State Key Laborutory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China Department of Chemical Engineering The University of MeIbournePurkwilleVictoria3010Austrulia

Utilization of carbon dioxide(CO_(2)) is of great significance in the development of CO_(2) absorption and the solution of greenhouse gas *** efficient conversion of CO_(2) into cyclic carbonate with green catalysts is essential for the more sustainable expansion of CO_(2) *** batch reactor is limited by low efficiency, high cost and low security. Meanwhile, continuous flow system showcased a myriad of virtues, including shortening the residence time from hours to seconds, and decreasing reaction temperature, and possessing the nature of easy industrial scale-up. In this paper, a continuous-flow microreaction system was developed to synthesis propylene carbonate(PC) from propylene oxide(PO) and CO_(2) using 1-butyl-3-methylimidazolium bromide([BMIM]Br) as catalyst. By observing the flow patterns inside microreaction system, the effects of reaction temperature, molar fraction of catalyst, operating pressure, residence time, molar ratio of CO_(2)/PO as well as recycling performance of catalyst on the overall performances were comprehensively evaluated into details. Under different reaction conditions,the flow patterns were set to vary between slug flow and annular flow. The results showed that the yield of propylene carbonate(PC) can reach99.7% at 140℃ and 3.0 MPa with the residence time of 166 s, while the recycling performance of the designed system greatly conforms the future trend of green chemistry.

关键词： Microreaction system Cyclic carbonate Ionic liquids

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LPS-induced TLR4 neuroinflammatory signaling in CHME-5 microglial cells

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Neuroimmunology and Neuroinflammation 2017年第10期4卷 219-231页

作者： Leandra KFigueroa-Hall Michael BAnderson Subhas Das Craig wstevens Randall LDavis Department of Pharmacology and Physiology Oklahoma State University Center for Health SciencesTulsaOK74107USA Department of Anatomy and Cell Biology Oklahoma State University Center for Health SciencesTulsaOK74107USA.

Aim: In the field of neuroinflammation, identifying specific effects of pharmacological agents and other factors is problematic given the relative difficulty and expense in obtaining and culturing primary microglia. Immortalized microglial cell lines are very useful, but only a limited number have been characterized for inflammatory signaling. Therefore, characterization of lipopolysaccharide (LPS)-induced toll-like receptor 4 (TLR4) signaling in CHME-5, a microglial cell line, is expected to be of value as an experimental model of inflammatory signaling in the central nervous system (CNS). Methods: It was recently suggested that CHME-5 cells are of rat origin, not human, hence, verification of this claim using short tandem repeat genotype sequencing, along with immunoblotting, reverse transcription-polymerase chain reaction, and immunocytochemistry techniques to validate that CHME-5 retain morphological, phenotypical, and functional characteristics of primary microglia were undertaken. Results: LPS induced inhibitor kappa B-alpha and nuclear factor-kappa B (NF-κB) p65 activation, NF-κB p65 binding activity, and tumor necrosis factor alpha gene ***, results also confirmed the maintenance of microglial phenotype as seen with increased cluster of differentiation 68 gene and protein expression, immunofluorescence, and the absence of glial fibrillary acidic ***4 gene expression and immunofluorescence were significantly increased after LPS treatment. Conclusion: These data demonstrate that CHME-5 cells are not human, but are indeed a beneficial tool for studying microglial inflammatory signaling.

关键词： Escherichia coli lipopolysaccharide nuclear factor-kappa B p65 cluster of differentiation 68 toll-like receptor 4 neuroinflammation

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