Kinetics and mechanism of catalytic oxidation of sodium ethyl mercaptide with microfluidics

Catalytic oxidation desulfurization of gasoline is a key process for the utilization of petroleum hydrocarbons. However, the inherent mechanism still remains unclear and the kinetic investigation is usually performed in processes with limited mass transfer rates. Herein, the kinetics and mechanism of catalytic oxidation of sodium ethyl mercaptide were investigated with microfluidics. On the basis of eliminating mass transfer resistance, the effects of temperature, pressure, residence time, and gas-liquid flow ratio on the oxidation were assessed. According to the results of UV-vis spectra and binding constant, it was confirmed that the catalytic center was in the form of dimer. A heterogeneous reaction kinetic model was proposed as such. The kinetic parameters close to intrinsic kinetics and corresponding kinetic rate expression were obtained.

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A New Concept of Stirred Multiphase Reactor Using a Stationary Catalytic Foam

Processes ◽

10.3390/pr6080117 ◽

2018 ◽

Vol 6 (8) ◽

pp. 117 ◽

Cited By ~ 2

Author(s):

Nassima Benamara ◽

Didier Assoua ◽

Louis Jaffeux ◽

Laurent Vanoye ◽

Florica Simescu-Lazar ◽

...

Keyword(s):

Mass Transfer ◽

High Mass ◽

Hydrogenation Rate ◽

Transfer Rates ◽

Promising Tool ◽

Intrinsic Kinetics ◽

Stirred Reactor ◽

Al2o3 Catalyst ◽

Absorption Of Hydrogen

Developing new stirred gas–liquid–solid reactors with high mass transfer capabilities is still a challenge. In this publication, we present a new concept of multiphase reactor using a stationary catalytic foam and a gas-inducing impeller. The gas–liquid (GL) and liquid–solid (LS) mass transfer rates in this reactor were compared to a stirred reactor with basket filled with beads. Batch absorption of hydrogen and measurement of α-methylstyrene hydrogenation rate on Pd/Al2O3 catalyst were used to evaluate kGLaGL coefficients and kLS coefficients, respectively. With similar LS transfer rates to the basket-reactor and much higher GL transfer rates, the new reactor reveals a very promising tool for intrinsic kinetics investigations.

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Experimental Investigation of the Effects of Surfactants on the Mass Transfer in Liquid-Liquid Extraction Equipments

Volume 2: Fora, Parts A and B ◽

10.1115/fedsm2007-37347 ◽

2007 ◽

Author(s):

A. Haghdoost ◽

M. Shah-Alami ◽

H. Mansouri

Keyword(s):

Mass Transfer ◽

Transfer Coefficient ◽

Mass Transfer Coefficient ◽

Terminal Velocity ◽

Liquid Extraction ◽

Drop Diameter ◽

Transfer Resistance ◽

Transfer Rates ◽

Liquid Liquid Extraction ◽

Triton X

Mass transfer rates to the drops in liquid-liquid extraction equipment are often likely to be reduced by the presence of surface active contaminants. This reduction in mass transfer is said to be due to a reduction in terminal velocity, and to changes in pattern of internal circulation. A single-drop extraction apparatus was used to investigate the dependency of mass transfer coefficient on the amount of surfactant added in a system of n-butanol/succinic acid/water. Three types of surfactants, SDS, DTMAC and Triton X-100, were used to study their effects on the inhibition of mass transfer in liquid-liquid extraction. The effect of surfactants concentration on extraction percentage, overall mass transfer coefficient, and extra mass transfer resistance was investigated for these surfactants. Also variation of terminal velocity as a function of surfactant concentration and drop diameter were illustrated for both surfactants. Finally these surfactants were compared to each other.

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Experimental and computational evaluation of mass transfer resistance of paper dryer fabrics

Nordic Pulp & Paper Research Journal ◽

10.3183/npprj-1995-10-03-p174-182 ◽

1995 ◽

Vol 10 (3) ◽

pp. 174-182

Author(s):

Bjorn Wilhelmsson ◽

Stig Stenstrom

Keyword(s):

Mass Transfer ◽

Mass Transfer Resistance ◽

Transfer Resistance ◽

Computational Evaluation

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Effects of Variable Transport Properties on Heat and Mass Transfer in MHD Bioconvective Nanofluid Rheology with Gyrotactic Microorganisms: Numerical Approach

Coatings ◽

10.3390/coatings11020231 ◽

2021 ◽

Vol 11 (2) ◽

pp. 231

Author(s):

Muhammad Awais ◽

Saeed Ehsan Awan ◽

Muhammad Asif Zahoor Raja ◽

Nabeela Parveen ◽

Wasim Ullah Khan ◽

...

Keyword(s):

Mass Transfer ◽

Transport Properties ◽

Heat And Mass Transfer ◽

Group Analysis ◽

Numerical Approach ◽

Validity Of Results ◽

Gyrotactic Microorganisms ◽

Transfer Rates ◽

Buongiorno’S Model ◽

Density Distributions

Rheology of MHD bioconvective nanofluid containing motile microorganisms is inspected numerically in order to analyze heat and mass transfer characteristics. Bioconvection is implemented by combined effects of magnetic field and buoyancy force. Gyrotactic microorganisms enhance the heat and transfer as well as perk up the nanomaterials’ stability. Variable transport properties along with assisting and opposing flow situations are taken into account. The significant influences of thermophoresis and Brownian motion have also been taken by employing Buongiorno’s model of nanofluid. Lie group analysis approach is utilized in order to compute the absolute invariants for the system of differential equations, which are solved numerically using Adams-Bashforth technique. Validity of results is confirmed by performing error analysis. Graphical and numerical illustrations are prepared in order to get the physical insight of the considered analysis. It is observed that for controlling parameters corresponding to variable transport properties c2, c4, c6, and c8, the velocity, temperature, concentration, and bioconvection density distributions accelerates, respectively. While heat and mass transfer rates increases for convection parameter and bioconvection Rayleigh number, respectively.

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Gas-liquid flow characterization and mass transfer study in a microreactor for oligomerization catalyst testing

Chemical Engineering and Processing - Process Intensification ◽

10.1016/j.cep.2021.108476 ◽

2021 ◽

pp. 108476

Author(s):

Mahmoud Kamaleddine ◽

Dr Charles Bonnin ◽

Dr Typhène Michel ◽

Dr Léna Brunet-Errard ◽

Dr Joëlle Aubin ◽

...

Keyword(s):

Mass Transfer ◽

Liquid Flow ◽

Flow Characterization ◽

Gas Liquid Flow ◽

Transfer Study

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Numerical Simulations of Decomposition of Hydrate Particles in Flowing Water Considering the Coupling of Intrinsic Kinetics with Mass and Heat Transfer Rates

ACS Omega ◽

10.1021/acsomega.1c03091 ◽

2021 ◽

Vol 6 (36) ◽

pp. 23355-23367

Author(s):

Geng Zhang ◽

Jun Li ◽

Gonghui Liu ◽

Hongwei Yang ◽

Honglin Huang

Keyword(s):

Heat Transfer ◽

Numerical Simulations ◽

Flowing Water ◽

Transfer Rates ◽

Intrinsic Kinetics ◽

Mass And Heat Transfer

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Prediction of Growth Parameters of Frost Deposits in Forced Convection

Journal of Heat Transfer ◽

10.1115/1.3244426 ◽

1981 ◽

Vol 103 (1) ◽

pp. 3-6 ◽

Cited By ~ 17

Author(s):

J. E. White ◽

C. J. Cremers

Keyword(s):

Mass Transfer ◽

Forced Convection ◽

Growth Parameters ◽

Experimental Investigations ◽

Experimental Conditions ◽

Transfer Rates ◽

Air Stream ◽

Transient Period ◽

Approximate Expressions ◽

Frost Layer

Experimental investigations of frost deposition under forced convection conditions have shown that in most cases heat and mass transfer rates become constant after an initial transient period. It is shown that, in such cases, approximately half of the mass transfer from a humid air stream to a frost layer diffuses inward, condenses and increases the density of the frost. The other half is deposited at the surface and increases the thickness of the layer. Approximate expressions for density and thickness of the frost layer are derived and compared with data from the literature and also with experimental work reported in this paper. The correlations are shown to work well for a broad range of experimental conditions.

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