Hydrogenation of oleochemicals at supercritical single-phase conditions: influence of hydrogen and substrate concentrations on the process

Hark, Sander van den; Härröd, Magnus

doi:10.1016/s0926-860x(00)00826-7

Cited by 62 publications

(23 citation statements)

References 16 publications

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“…[156] Van den Hark and co-workers developed an extremely fast and selective hydrogenation process for fatty acid methyl esters in supercritical propane. [157] The single-phase operation was performed at 100 8C, a hydrogen pressure of 4 bar, and a residence time of 400 ms using 3 % Pd supported on aminopolysiloxane. The reaction rate was roughly 500 times higher than in traditional batch hydrogenations.…”

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confidence: 99%

Heterogeneous Catalytic Hydrogenation Reactions in Continuous‐Flow Reactors

2011

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Microreactor technology and continuous flow processing in general are key features in making organic synthesis both more economical and environmentally friendly. Heterogeneous catalytic hydrogenation reactions under continuous flow conditions offer significant benefits compared to batch processes which are related to the unique gas-liquid-solid triphasic reaction conditions present in these transformations. In this review article recent developments in continuous flow heterogeneous catalytic hydrogenation reactions using molecular hydrogen are summarized. Available flow hydrogenation techniques, reactors, commonly used catalysts and examples of synthetic applications with an emphasis on laboratory-scale flow hydrogenation reactions are presented.

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confidence: 99%

Heterogeneous Catalytic Hydrogenation Reactions in Continuous‐Flow Reactors

2011

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“…The kinetics of the various hydrogenations measured in supercritical CO 2 and propane (among others [54][55][56]90]) were in good agreement. The reaction rates in supercritical propane were somewhat higher than in supercritical CO 2 and amounted to 7 mol H 2 /(g(Pd) h) on average.…”

Section: Hydrogenations (For Surveys See [46 47])mentioning

confidence: 58%

Heterogeneous Catalysis in Supercritical Media: 1. Carbon Dioxide

Kruse

Vogel

2007

Chem Eng & Technol

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Dedicated to Prof. Dr.-Ing. Jens Weitkamp on the occasion of his 65th birthdayOver the past few years, supercritical fluids have received considerable interest as reaction media. Supercritical fluids combine properties of gases and liquids. Densities are lower than in the liquid phase, but significantly higher than in the gas phase. This makes supercritical fluids excellent solvents for a variety of substances. The good dissolution capacity exists only in or near the supercritical range. Reaction products can be separated, for instance, simply by decreasing temperature and pressure. This may be used to intensify the process as complex separation processes, like distillation, are avoided.

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“…Furthermore, fatty acid methylesters were hydrogenated to the respective fatty alcohols in supercritical propane. A complete conversion was reached within a few seconds, as the reaction rate was not limited by phase boundaries [39][40][41]. Hydrogenation of cyclohexene [42] and other organic substances in supercritical propane was successful when using Pd/deloxane as a catalyst [43].…”

Section: Hydrocarbonsmentioning

confidence: 99%