Catalytic Polymer Membranes for high Temperature Hydrogenation of viscous Liquids

Abstract

Polymeric membranes with high oil fluxes were developed and catalytically activated by a new route of direct calcination of polymeric membranes charged by Pd or Pt catalyst precursors. High concentrations of citric acid mixed with the precursors afforded a decrease of the calcination temperature to 175°C. Membrane reactor tests in the flow through contactor mode displayed high reactivities for sunflower oil hydrogenation. Pt showed a similar activity to Pd catalysts as measured by iodine value and generated about 13% less trans‐isomers but 5% more stearic acid at an iodine value of 90. By means of alumina supported catalysts tests of methyl oleate (cis‐C18:1) and methyl elaidate (trans‐C18:1) hydrogenation exhibited a different pathway of reaction by either isomerization followed by reduction (Pd) or primarily direct reduction to methyl stearate (Pt).

Adlayers of palladium particles and their aggregates on porous polypropylene hollow fiber membranes as hydrogenization contractors/reactors

“…Noteworthy is that the correct design of porous polymeric catalytic membrane makes it possible to achieve both flow-through [25][26][27][28][29], and interfacial [30][31][32][33][34][35] contactor modes. This study is devoted to the further development of research activities on the preparation of CMRs, namely, contactors of interfacial mode for the removal of dissolved oxygen (DO) from water.…”

“…Follow-up studies on the development of polymeric catalytic membranes were performed in the two following directions: (i) dense catalytic membranes [9][10][11][12][13][14][15][16][17][18] and (ii) porous catalytic membranes for both gas phase hydrogenation [19][20][21][22][23][24] and liquid phase hydrogenation [25][26][27][28][29][30][31][32][33][34][35].…”

Catalytic Polymer Membranes under Forcing Conditions: Reduction of Nitrobenzene by CO/H2O Catalyzed by Ruthenium Bis(arylimino)acenaphthene Complexes

“…The limit of such systems is the thermal and solvent stability of the membrane itself. Although the use of Nafion and related polymers membranes up to 120 8C has been reported, [6] as has the use of a polyamideimide membrane at 100 8C, [7] these cases involved metallic nanoparticles as catalysts and these are not easily released from the membrane itself. In contrast, when monomeric metal complexes were embedded into polymeric membranes the reactions were almost invariably conducted at room temperature or slightly above it.…”

Partial Hydrogenation of Soybean Oil with Minimal Trans Fat Production Using a Pt‐Decorated Polymeric Membrane Reactor

“…The amount of TFAs formed using these membranes with a platinum catalyst was 15 wt.% at an IV of around 98 (80°C, 290 psi H 2 ). Fritsch et al [7] developed microporous polymer membranes with very high oil fluxes (1,000-2,000 L m -2 h -1 bar -1 ) and the membranes were activated with platinum. The membranes were then used for hydrogenation of sunflower oil at 100°C and 58 psi.…”

“…Other modifications which have been reported to lead to low TFA include using a solvent to increase hydrogen solubility in oil under supercritical conditions [5], using novel reactors like electrochemical hydrogenation cell [6], or other novel reactor configurations [7][8][9].…”