Diffusivities of hydrogen and glyceryl trioleate in cottonseed oil at elevated temperature

Andersson, Klas; Hell, M.; Löwendahl, Lars; Schöön, N.-H.

doi:10.1007/bf02639732

Cited by 43 publications

(30 citation statements)

References 13 publications

(10 reference statements)

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“…H and n 1 are the parameters optimized by Fillion and Morsi (2000). In the present work, the authors used data for diffusivity coefficients from the literature (Andersson et al, 1974, Andersson and Berglin, 1982, Ganguli and Berg, 1978, Gut et al, 1979, but more accurate viscosity values could be obtained with the developed model. Indeed, this viscosity model was optimized for the same type of oils used for the respective diffusivity measurements, by taking complementary experimental data for the fitting (Gupta et al, 2007, Ganguli and Berg, 1978, Hasenhuettl, 2000.…”

Section: Mathematical Modelingmentioning

confidence: 99%

Accurate hydrogenated vegetable oil viscosity predictions for monolith reactor simulations

Albrand

Julcour-Lebigue²,

Gerbaud³

et al. 2020

Chemical Engineering Science

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h i g h l i g h t s Contribution group model to predict viscosity of partially hydrogenated edible oils. CFD simulations of a three-phase catalytic monolith reactor with viscosity change. Investigation of two-way coupling between hydrodynamics, transport and reaction. Strong limitations by mass transfer of fatty acids highlighted. Reactor performances greatly impacted by the evolution of viscosity and diffusivity.

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Section: Mathematical Modelingmentioning

confidence: 99%

Accurate hydrogenated vegetable oil viscosity predictions for monolith reactor simulations

Albrand

Julcour-Lebigue²,

Gerbaud³

et al. 2020

Chemical Engineering Science

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“…For fatty acid methyl ester hydrogenation over Pd/C catalyst, Tsuto et al46 could verify the observed shunt reactions by incorporating intraparticle hydrogen diffusion limitation, although not very accurately because of the insensitivity of the curves for the value of D

_{italice,H_{2}}

= 3.6 × 10 −9 m 2 /s at 443 K. An estimated value of D

_{italice,H_{2}}

= 4 × 10 −9 m 2 /s at 443 K was obtained from the experimental data by Andersson et al47 and Ganguli and Van den Berg,48 which is in agreement with the data of Tsuto et al46…”

Section: Introductionmentioning

confidence: 99%

Intraparticle diffusion mechanisms in SC sunflower oil hydrogenation on Pd

2005

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“…In the case of the hydrogen‐transfer limitations, the H 2 Weisz‐Prater modulus, Φ

_{H_{2}}

, was determined by using r /${\tilde C}$ )=0.428 s −1 evaluated from experimental data and D eff of 1.2×10 −8 m 2 s −1 43. The calculated value of Φ

_{H_{2}}

was 17.64>1.…”

Section: Resultsmentioning

confidence: 99%

Sulfur Promotion in Conjugated Isomerization of Safflower Oil over Bifunctional Structured Rh/SBA‐15 Catalysts

et al. 2013

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The sulfur effect on conjugated linoleic acid isomer (CLA) formation during the combined hydrogenation/directed isomerization of safflower oil over a bifunctional (hydrogenation and isomerization) highly structured rhodium‐based catalyst (Rh/SBA‐15) was investigated either by direct addition of increased concentrations of 3‐mercapto‐1,2‐propanediol to the reaction medium or by doping Rh/SBA‐15 with the same sulfur‐based compound yielding the sulfur‐doped Rh‐catalyst (S–Rh/SBA‐15). These catalysts exhibited interesting activity, stability, and recyclability. The maximum CLA contents obtained during the combined reactions with 0, 0.2, 1, 2, 5, and 10 ppm sulfur additions were 73, 99, 131, 110, 105, and 68 mgCLA goil−1, respectively, whereas the amount of harmful trans monoenes remained below 8 %. The safflower oil after partially hydrogenation under the same conditions over S–Rh/SBA‐15 catalyst contained up to 110 mgCLA goil−1. These results showed clear evidence of the sulfur promotion effect on CLA formation during the dual hydrogenation/directed isomerization of safflower oil. A mechanism for the sulfur promotion of the heterogeneous catalyst Rh/SBA‐15 for the conjugated isomerization activity during hydrogenation/directed isomerization of safflower oil was determined by solid‐state 1H NMR analysis of the fresh and spent catalysts. This was also confirmed by liquid‐state 2H NMR analysis of deuterium‐labeled product aliquots withdrawn throughout the reaction. The sulfur promotion towards the double bond conjugation of linoleic acid to form CLA isomers could be explained mechanistically through the preferable formation of the more nucleophilic rhodium sulfide (RhSH) over that of the hydride (RhH). However, both types of Rh clusters constituted distinct catalytic sites leading to the formation of hydrogenation as well as conjugated and geometric isomerization products. The lumped kinetics model described the experimental data well and complied simply with the proposed mechanism.

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Diffusivities of hydrogen and glyceryl trioleate in cottonseed oil at elevated temperature

Cited by 43 publications

References 13 publications

Accurate hydrogenated vegetable oil viscosity predictions for monolith reactor simulations

Accurate hydrogenated vegetable oil viscosity predictions for monolith reactor simulations

Intraparticle diffusion mechanisms in SC sunflower oil hydrogenation on Pd

Sulfur Promotion in Conjugated Isomerization of Safflower Oil over Bifunctional Structured Rh/SBA‐15 Catalysts

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