Kinetic modeling of glycerolysis–hydrolysis of canola oil in supercritical carbon dioxide media using equilibrium data

Moquin, Paul; Temelli, Feral; Sovová, Helena; Saldaña, Marleny D.A.

doi:10.1016/j.supflu.2006.01.009

Cited by 41 publications

(31 citation statements)

References 14 publications

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“…Many studies have reported the kinetic parameters for the non-catalytic hydrolysis of refinery rapeseed oil in subcritical water [35], of canola oil in supercritical carbon dioxide media [24,36] and of various oils (coconut, peanut, and beef tallow) in a batch reactor [33]. However, the solid acid catalyzed hydrolysis of TGs has only been investigated by Yow and Liew using palm oil [26].…”

Section: Apparent Reaction Orders For Wz Catalyzedmentioning

confidence: 99%

“…The complexity of water-oil mixtures makes it difficult to obtain good initial kinetic data due to 2-liquid phase behavior [37]. It was found that for the 2-phase situation, the rate of dissolving of water in oils is the RDS of hydrolysis with the solubility of water in oil increasing with FFA formation [24,26,36]. Use of a model triglyceride (TCp) and low concentrations of water in this kinetic study permitted us to determine the solid-acid catalyzed hydrolysis mechanism without 2-phase problems.…”

Section: Apparent Reaction Orders For Wz Catalyzedmentioning

confidence: 99%

“…5a, b were a = 1.34 and b = -1.15 for water-to-TCp molar ratios of 0.8-1.2. The reaction orders for non-catalytic reaction in the temperature range of 100-250°C [24,33,36] and for catalyzed hydrolysis on a macroporous cation-exchange resin at 155°C [26] have been reported to be 1 for both TG and water. Under non-catalytic conditions, acid sites are not required to carry out this reaction, thus when the amount of water as a reactant increases, the reaction rate should increase [23].…”

Section: Apparent Reaction Orders For Wz Catalyzedmentioning

confidence: 99%

“…Interestingly, the reaction pathway of transesterification [8], namely alcoholysis is similar to that of hydrolysis [24]. Hydrolysis and transesterification of TGs each consist of three consecutive reversible reactions.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reaction Kinetics and Mechanisms for Hydrolysis and Transesterification of Triglycerides on Tungstated Zirconia

Ngaosuwan

Goodwin

et al. 2010

Top Catal

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Hydrolysis and transesterification are two reactions which can occur during the synthesis of biodiesel. An Investigation of the mechanistic pathways in hydrolysis and transesterification were carried out at a relatively high temperature (100-130°C) and moderate pressures (120-180 psi) with tricaprylin and water for hydrolysis or methanol for transesterification using a tungstated zirconia catalyst in a batch reactor. It was found that upon increasing the concentration of TCp, the reaction rates for both hydrolysis and transesterification increased at all conditions. In contrast, water inhibited the reaction rate of hydrolysis by poisoning the active sites. For transesterification, the apparent reaction order of methanol evolved from positive to negative as the concentration of methanol relative to TCp increased. Using a reaction model discrimination procedure, it was found that hydrolysis on WZ could be successfully described by an Eley-Rideal single site mechanism with adsorbed TCp reacting with bulk phase water. The mechanistic pathway for transesterification also seems to follow a similar mechanism, identical to the one previously proposed for transesterification on a solid acid catalyst (SiO 2 -supported Nafion-SAC-13) at lower temperature (60°C).

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Section: Apparent Reaction Orders For Wz Catalyzedmentioning

confidence: 99%

Section: Apparent Reaction Orders For Wz Catalyzedmentioning

confidence: 99%

Section: Apparent Reaction Orders For Wz Catalyzedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reaction Kinetics and Mechanisms for Hydrolysis and Transesterification of Triglycerides on Tungstated Zirconia

Ngaosuwan

Goodwin

et al. 2010

Top Catal

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“…It was possible to describe the measured data by the limited set of reactions detailed in Tab. 2, in the same way as proposed by Moquin et al for the hydrolysis of triglycerides [14]. Further possible reactions, e.g., the rearrangement of 2-monoglycerides to 1-monoglycerides and the reaction of 1-monoglycerides to glycerol and ester have been excluded so far.…”

Section: Modeling Of the Reactionsmentioning

confidence: 80%

A Supercritical Fluid‐Assisted, Integrated Process for By‐Products from Fat and Lipid Production

Weber¹,

Lee²,

Shin

et al. 2007

Chem Eng & Technol

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An integrated process for the enzymatic alcoholysis of lipids and the separation of the products by supercritical fluid extraction has been designed and tested with a commercial vegetable oil. The optimization of the reaction conditions and the fractionated separation in a cascade of three separators, which were operable at different temperatures and pressures, have been tested. The fractions were analyzed by HPLC for their content of fatty acid esters and different acylglycerides.

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Assessment of variable effects on solvent‐free monoacylglycerol enzymatic production in AOT surfactant

Fiametti

Rovani

Oliveira

et al. 2008

Euro J Lipid Sci & Tech

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This work reports the application of a lipase in the glycerolysis of olive oil for the production of monoacylglycerols (MAG). For this purpose, the enzymatic glycerolysis of olive oil with an immobilized lipase (Novozym 435) was accomplished using sodium (bis-2-ethyl-hexyl) sulfosuccinate (Aerosol-OT or AOT) as surfactant in a solvent-free system. A sequential strategy was used applying two experimental designs to optimize the MAG production. In general, it was observed that the temperature had a negligible effect on MAG conversion while the enzyme and AOT concentrations present a positive significant effect (p ,0.05) and the stirring rate a negative one. An empirical model was then built so as to assess the effects of process variables on the reaction conversion. Afterwards, the operating conditions that optimized MAG production were established as follows: temperature of 70 7C, stirring rate of 600 rpm, 16 wt-% of AOT and 7.5 wt-% of enzyme, leading to a reaction conversion as high as 55%.

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Kinetic modeling of glycerolysis–hydrolysis of canola oil in supercritical carbon dioxide media using equilibrium data

Cited by 41 publications

References 14 publications

Reaction Kinetics and Mechanisms for Hydrolysis and Transesterification of Triglycerides on Tungstated Zirconia

Reaction Kinetics and Mechanisms for Hydrolysis and Transesterification of Triglycerides on Tungstated Zirconia

A Supercritical Fluid‐Assisted, Integrated Process for By‐Products from Fat and Lipid Production

Assessment of variable effects on solvent‐free monoacylglycerol enzymatic production in AOT surfactant

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