Overcoming mass‐transfer limitations in partial hydrogenation of soybean oil using metal‐decorated polymeric membranes

Abstract

The conventional soybean oil hydrogenation process (metal catalyst on solid support particles slurried in oil, H 2 bubbled through the oil) is compared to metaldecorated integral-asymmetric polyetherimide (PEI) membranes, as far as changes in temperature and pressure are concerned. Using metal decorated-polymeric membranes, H 2 is supplied to the catalytic sites by permeation from the membrane substructure. As opposed to the slurry process, metal-decorated membranes show only slightly increased trans fatty acid (TFA) formation when the temperature is raised (50-90°C) to accelerate the process. This is likely due to the efficient and to some extent self-regulating H 2 supply directly to the catalytic sites on the membrane skin. The hydrogenation rate and TFA formation of the metal decorated membrane process show a minor dependence on pressure.

Optimization of Sunflower Oil Hydrogenation on Pd-B/-Al2O3 Catalyst

“…Fig.7 (a) and 7 (b) show that the maximum IV decline and minimum TFA formation were associated with maximum H 2 pressure and agitation rate. These results are agreed with the comments and observations of Abdullina et 6,8,10,30 An increase in the Pd-B/³-Al 2 O 3 catalyst dose implies increased the area of active sites which requires increasing the H 2 concentration on the catalyst surface to achieve the required conversion. So, if the H 2 concentration is not sufficient to meet the requirements of the increase in the area of active sites, the active sites will tend fortrans-isomerization over hydrogenation.…”

Effect of vapor phase ethylenediamine crosslinking of matrimid on alcohol vapor sorption and diffusion

“…[4][5][6][7] A growing application for membranes that also potentially encounters harsh gas and liquid chemical environments is the use of the membrane in a chemically reactive system, or membrane reactor. [8][9][10][11][12][13] Membrane reactors offer a unique approach combining reaction and separation of desirable products or selective delivery of reactants into catalytic systems at controlled rates and location. The use of polymeric membranes for this application, in contrast to ceramic and metal based membranes, is advantageous considering the high fluxes that are possible, the ease in processability, and comparatively lower cost in manufacturing.…”

“…This study is motivated by our continued work on applying asymmetric polyimide membranes for membrane reactor applications in three-phase hydrogenation reactions. [12][13][14] Matrimid was chosen for the membrane reactor application and this study, because it is a commercially available polyimide with a glass transition temperature of 320 8C and is known to be stable in a wide range of chemical environments. 4,15 Our previous work examined sorption of many organic solvents in unmodified Matrimid, and characterized the sorption and diffusive behavior of C1-C7 alcohol vapors in unmodified Matrimid over the P/P sat range 0 to 0.9.…”

“…Chemical crosslinking is often employed in membrane based gas separation applications where one or more of the gases cause significant plasticization, as in the removal of CO 2 from natural gas, and in the area of solvent‐resistant nanofiltration where the separation of harsh liquid organic solvents is often encountered . A growing application for membranes that also potentially encounters harsh gas and liquid chemical environments is the use of the membrane in a chemically reactive system, or membrane reactor . Membrane reactors offer a unique approach combining reaction and separation of desirable products or selective delivery of reactants into catalytic systems at controlled rates and location.…”

“…This study is motivated by our continued work on applying asymmetric polyimide membranes for membrane reactor applications in three‐phase hydrogenation reactions . Matrimid was chosen for the membrane reactor application and this study, because it is a commercially available polyimide with a glass transition temperature of 320 °C and is known to be stable in a wide range of chemical environments .…”