Partial hydrogenation of fatty acid methyl esters at supercritical conditions

Macher, Maj-Britt; Högberg, Johan; Møller, Poul; Härröd, Magnus

doi:10.1002/(sici)1521-4133(199908)101:8<301::aid-lipi301>3.0.co;2-n

Cited by 32 publications

(18 citation statements)

References 9 publications

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“…The experimental setup and procedure were the same as reported previously [3], except for a slight modification in the substrate feeding: Since palm oil is semi-solid at room temperature, it had to be melted before it could be pumped into the system (by means of an HPLC pump). The storage vessel, tubing to the pump head, and tubing from the pump into the oil bath were all kept at ca.…”

Section: Methodsmentioning

confidence: 99%

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Hydrogenation of palm oil in near-critical and supercritical propane

Macher

Holmqvist

2001

Eur. J. Lipid Sci. Technol.

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Palm oil was hydrogenated in a single-phase mixture with propane and hydrogen. This was done in a small (0.5 ml), continuous fixed-bed reactor, using a 1% Pd/C catalyst. Temperature (65-135 o C), H 2 /TG ratio (4-50 mol/mol) and residence time (0.2-2.0 s) were varied systematically to assess the iodine value (IV) as a function of these three variables. The substrate concentration was 1 wt-%. The IV was dependent mainly on temperature and residence time. At 120 o C and a residence time of 2.0 s, full hydrogenation was achieved. The trends observed indicate that this is possible even at lower temperatures, if the residence time is increased further. Unexpectedly, the hydrogen concentration (i.e. the H 2 /TG ratio) was of minor importance, which can be a sign of either H 2 -saturation of the catalyst or a phase-split of the reaction mixture with resulting mass transport limitations for the hydrogen. Unfortunately, the catalyst showed strong signs of deactivation very early in the experiments, possibly due to impurities in the feedstock and/or to coke formation.

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Section: Methodsmentioning

confidence: 99%

“…FAME was used as a model substance because of its higher solubility and simpler analysis. The results showed very high reaction rates; very low trans fatty acid levels (< 5%) were often achieved [3].…”

Section: Introductionmentioning

confidence: 96%

Hydrogenation of palm oil in near-critical and supercritical propane

Macher

Holmqvist

2001

Eur. J. Lipid Sci. Technol.

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“…4, the solubility of H 2 in the cathode electrolyte increased with increasing H 2 pressure. This is mainly because the increase in the system pressure increases the H 2 concentration in the reaction system, so that increases the gas density, which increases the amount of hydrogen dissolved in soybean oil and the amount of hydrogen diffused to the surface of the catalyst 23,24 . The solubility of H 2 in the anode electrolyte was consistent with the change in the cathode.…”

Section: Solubility and Consumption Of H 2 In The Electrolytementioning

confidence: 99%

Study on the Electrochemical Hydrogenation of Soybean Oil under H<sub>2</sub> Conditions

et al. 2019

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The solubility of H 2 in electrolytes, H 2 reaction consumption and the conductivity of electrolytes under different pressures in an electrochemical hydrogenation reactor were studied. It was found that with an increase in H 2 pressure, H 2 was electrolyzed at the anode, accompanied by the generation of H +. The solubility of H 2 in the electrolytes and the conductivity of the electrolytes also increased. At first, the reaction consumption increased, followed by a tendency to be stable at 3 MPa. Therefore, the electrochemical hydrogenation of soybean oil was carried out at a H 2 pressure of 3 MPa. When the current was 120 mA, the temperature was 50℃, the agitation speed was 300 rpm, and the time was 7.5 h, the IV of hydrogenated soybean oil was 99.6 g I 2 /100 g oil, and the TFA content of the oil was 4.3%.

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“…Remarkable results were achieved by Macher et al who used fatty acid methyl esters from rapeseed oil diluted in propane. They managed to reach 3.8% TFA for an iodine value (IV) of 70 by employing a trickle bed reactor with Pd impregnated pellets.…”

Section: Introductionmentioning

confidence: 99%

Sunflower Hydrogenation in Taylor Flow Conditions: Experiments and Computational Fluid Dynamics Modeling Using a Moving Mesh Approach

Albrand

Julcour-Lebigue

Billet

2021

Ind. Eng. Chem. Res.

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Sunflower oil hydrogenation was carried out in a 2 mm diameter jacketed capillary reactor coated with a Pd/Al 2 O 3 catalyst, mimicking a channel of a heat exchanger monolith reactor. The operating conditions were chosen to ensure Taylor flow conditions and to evaluate their impact on the reaction selectivity. CFD simulations of the experiments were performed using the unit cell approach. They accounted for the dependence of viscosity on the degree of oil saturation, kinetic laws describing the effects of pressure on cis/trans selectivity, and bubble shrinkage along the channel using a moving mesh strategy. The model captured the experimental trends, in which the fraction of monounsaturated cis fatty acids did not exceed 35% (vs 30% originally). Poor selectivity is mainly due to the strong mass transfer resistance at the catalyst wall, either from fatty acids (favoring their complete saturation) and/or from hydrogen (due to bubble shrinkage, favoring cis to trans isomerization).

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Partial hydrogenation of fatty acid methyl esters at supercritical conditions

Cited by 32 publications

References 9 publications

Hydrogenation of palm oil in near-critical and supercritical propane

Hydrogenation of palm oil in near-critical and supercritical propane

Study on the Electrochemical Hydrogenation of Soybean Oil under H<sub>2</sub> Conditions

Sunflower Hydrogenation in Taylor Flow Conditions: Experiments and Computational Fluid Dynamics Modeling Using a Moving Mesh Approach

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