In the current technology catalyst particles are immersed in oil that contains small amounts of dissolved hydrogen which results in the catalyst surface being hydrogen starved and thus promotes the isomerisation to TFAs. Our approach is to combine the existing and productive catalysts available for liquid phase hydrogenation with a novel approach for the delivery of hydrogen to the catalyst surface. In this approach, the multiple phase reactors currently employed are replaced by a membrane reactor capable of selectively supplying hydrogen to the catalyst surface at the rate of consumption. A membrane capable of selectively transporting hydrogen while acting to prevent any loss of liquid phase is incorporated in the reactor housing. Oil is pumped on one surface of the membrane where it comes into contact with the catalytic metal surface supported on the polymeric integral-asymmetric membrane support. The metal catalyst has a high hydrogen coverage achieved by diffusion through the membrane due to an imposed chemical potential driving force. High concentrations of hydrogen on the catalyst surface, and the resulting decrease in necessary temperature and pressure, promote the hydrogenation reaction at the expense of the unwanted cis to trans isomerization. The metal-polymer composite membrane properties like gas flux, selectivity, and catalyst concentration / surface area have a significant influence on the hydrogenation and cis-trans isomerization. The surface of the membrane was studied using SEM and TEM techniques. The presentation will discuss the concept, the properties of the composite membranes and the effect it has on the hydrogenation and cis-trans isomerization.