Electrocatalytic hydrogenation of soybean oil in a radial flow-through Raney nickel powder reactor

1996 ◽  
Vol 26 (10) ◽  
Author(s):  
G. Yusem ◽  
P.N. Pintauro ◽  
P.-C. Cheng ◽  
W. An
Keyword(s):  
Soybean Oil ◽  
Raney Nickel ◽  
Nickel Powder ◽  
Radial Flow ◽  
Electrocatalytic Hydrogenation ◽  
Flow Through

Capillary water absorption by a porous cylinder

2017 ◽  
Vol 42 (2) ◽  
pp. 120-124 ◽  
Author(s):  
Christopher Hall
Keyword(s):  
Radial Flow ◽  
Effective Porosity ◽  
Capillary Absorption ◽  
Porous Cylinder ◽  
Capillary Water ◽  
Cylinder Axis ◽  
Flow Through ◽  
Front Model ◽  
Sharp Front ◽  
Good Agreement

Capillary absorption (imbibition) of water by a porous cylinder is described by means of a Sharp-Front model. The cumulative absorption increases as (time)1/2 at early times, but more slowly as the wet front approaches the cylinder axis. Results are given in terms of dimensionless variables. Experimental data on plaster cylinders are in good agreement with theory. Estimates of the sorptivity and effective porosity of the material can be obtained. The model may be useful in testing drilled cores and may also be applied to radial flow through the wall of a porous tube (hence to conduits and arches).

The electrocatalytic hydrogenation of fused poly cyclic aromatic compounds at Raney nickel electrodes: the influence of catalyst activation and electrolysis conditions

1990 ◽  
Vol 68 (7) ◽  
pp. 1218-1227 ◽  
Author(s):  
Denis Robin ◽  
Michel Comtois ◽  
Anna Martel ◽  
René Lemieux ◽  
Amoy Kam Cheong ◽  
...  
Keyword(s):  
Raney Nickel ◽  
Supporting Electrolyte ◽  
Aqueous Sodium Hydroxide ◽  
Constant Current ◽  
Electrocatalytic Hydrogenation ◽  
Catalyst Activation ◽  
Nickel Electrodes ◽  
Initial Ph ◽  
Raney Ni ◽  
Tetrabutylammonium Chloride

The electrocatalytic hydrogenation (ECH) of phenanthrene, anthracene, and naphthalene has been investigated under constant current at Raney nickel electrodes in a mixed aqueous organic medium. The influence of various parameters on the efficiency of the process determined by the current efficiency (a measure of the competition between hydrogenation and hydrogen evolution, the only two electrochemical processes occurring), the extent of hydrogenation (yield of octahydro-derivatives), and the conversion rate was studied with phenanthrene. The best conditions were ethylene glycol or propylene glycol as cosolvent containing between 1.5 to 5% of water, a neutral or slightly acidic medium containing boric acid (0.1 M) as buffer (initial pH of 2.6, final pH of 6.0–6.2), sodium chloride or tetrabutylammonium chloride as supporting electrolyte, a temperature of 80° C, and a current density of 42 to 84 mA/cm2. The most active electrodes (consisting of Raney Ni particles dispersed in a nickel matrix and surrounded by a layer of porous nickel) were obtained by leaching the dispersed alloy particles at 75 °C for 7 h in 30% aqueous sodium hydroxide. The electrohydrogenation stopped at derivatives with a single aromatic ring, namely the octahydrophenanthrenes, octahydroanthracenes, and tetralin. In a non-buffered medium, tetrahydrophenanthrene could be obtained with selectivities of 80% or better. Keywords: electrocatalytic hydrogenation, Raney nickel electrodes, phenanthrene, anthracene, naphthalene.

The electrocatalytic hydrogenation of soybean oil

1992 ◽  
Vol 69 (5) ◽  
pp. 399-404 ◽  
Author(s):  
G. J. Yusem ◽  
P. N. Pintauro
Keyword(s):  
Soybean Oil ◽  
Electrocatalytic Hydrogenation

The electrocatalytic hydrogenation of phenanthrene at Raney nickel electrodes: the influence of an inert gas pressure

1998 ◽  
Vol 43 (12-13) ◽  
pp. 1697-1703 ◽  
Author(s):  
Richard Menini ◽  
Anna Martel ◽  
Hugues Me ́nard ◽  
Jean Lessard ◽  
Olivier Vittori
Keyword(s):  
Raney Nickel ◽  
Gas Pressure ◽  
Inert Gas ◽  
Electrocatalytic Hydrogenation ◽  
Nickel Electrodes

ChemInform Abstract: ASYMMETRIC SYNTHESIS BY MODIFIED RANEY NICKEL POWDER ELECTRODES

1983 ◽  
Vol 14 (4) ◽  
Author(s):  
M. FUJIHIRA ◽  
A. YOKOZAWA ◽  
H. KINOSHITA ◽  
T. OSA
Keyword(s):  
Asymmetric Synthesis ◽  
Raney Nickel ◽  
Nickel Powder
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