Hydrogenation under supercritical single-phase conditions

Härröd, Magnus; Macher, Maj-Britt; Hark, Sander van den; Møller, Poul

doi:10.1016/s0926-9614(01)80029-0

Cited by 15 publications

(18 citation statements)

References 14 publications

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“…A key factor in the use of supercritical solvent in vegetable oil hydrogenation is that under certain conditions, the concentrations of H 2 , triglycerides (TGs), and solvent can be varied independently over the external catalyst surface,13 without any limitation, provided only that phase separation is avoided. Such a one‐phase condition cannot possibly be achieved in the conventional low‐pressure slurry process, where the reaction rate and selectivities are determined by the availability of reactant dissolved in the liquid from gas bubbles, and its transport through the liquid and through the liquid–solid boundary layer onto the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Intraparticle diffusion mechanisms in SC sunflower oil hydrogenation on Pd

2005

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Section: Introductionmentioning

confidence: 99%

Intraparticle diffusion mechanisms in SC sunflower oil hydrogenation on Pd

2005

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“…Another application that will probably become large scale is the hydrogenation of edible oil components. Hydrogenation of fatty acid methyl esters to fatty alcohols is carried out in a single gaseous phase by adding propane, which dissolves both substrate and hydrogen (88). Single-phase conditions have been achieved at a loading of 15-20 wt% for different lipids at a total pressure of 15 MPa.…”

Section: Hydrogenationmentioning

confidence: 99%

“…Reaction time is in the range of seconds if the hydrogenation reactions are carried out in continuous flow reactors. A pilot plant began operation in 2002, but it seems that collaboration of specialists in different areas is necessary to develop this technology to a standard industrial hydrogenation process (88).…”

Section: Hydrogenationmentioning

confidence: 99%

Applications of Supercritical Fluids

Brunner

2010

Annu. Rev. Chem. Biomol. Eng.

273

111

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This review discusses supercritical fluids in industrial and near-to-industry applications. Supercritical fluids are flexible tools for processing materials. Supercritical fluids have been applied to mass-transfer processes, phase-transition processes, reactive systems, materials-related processes, and nanostructured materials. Some applications are already at industrial capacity, whereas others remain under development. In addition to extraction, application areas include impregnation and cleaning, multistage countercurrent separation, particle formation, coating, and reactive systems such as hydrogenation, biomass gasification, and supercritical water oxidation. Polymers are modified with supercritical fluids, and colloids and emulsions as well as nanostructured materials exhibit interesting phenomena when in contact with supercritical fluids that can be industrially exploited. For these applications to succeed, the properties of supercritical fluids in combination with the materials processed must be clearly determined and fundamental knowledge of the complex behavior must be made readily available.

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“…In the conventional process, low reaction rates and the formation of undesirable by-products (such as trans C18:1 fatty acid content about 40 wt%) are consequences of the low solubility of H 2 in the oil and the high mass transfer resistance for the hydrogen in the liquid phase (Farrauto and Bartholomew, 1997). Supercritical technology has proven to be a reliable alternative to the conventional hydrogenation process (Härröd et al, 2001;Tacke et al, 2003) resulting in increasing the rate of reaction and reduced trans isomer levels. It also provides a clean, economic and environmental friendly process.…”

Section: Introductionmentioning

confidence: 99%