Abstract
A new experimental set up has been applied to accurately monitor the H 2 absorption rate in edible oil hydrogenation by using a Peteric Pressflow Controller. This technique was used to determine the deleterious effect on the rate of hydrogenation of a S-component, namely dibutyl sulphide, added to soybean oil in amounts of 0.5, 1, 2 and 4 times the amount required to poison the Ni surface with one S per two Ni atoms. This new technique proved to be a valuable method which made it possible to follow the iodine value as a function of time and to calculate the reduction in the hydrogenation rate accurately. The turnover numbers calculated for the initial rates and based on two different, estimated, values for the effective H 2 diffusion coefficient were about a factor 5 to 8 times lower due to the presence of sulphur.
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