The possibility of application of rapeseed oil hydrogenated with fresh and spent (previously used for rapeseed hydrogenation) nickel catalyst for the production of cocoa butter replacer has been examined. Because the fat hydrogenated with spent catalyst had similar properties to the fat obtained with industrial sulfur-modified nickel catalyst (ISMN catalyst), the rapeseed oil was hydrogenated with spent catalyst to iodine values (ca. 76) similar for ISMN catalyst. The hydrogénation mechanism with fresh nickel catalyst is different, therefore, during its usage oil was hydrogenated to lower iodine values (65-59). The hydrogenated rapeseed oil with fresh and spent nickel catalyst was fractionated by crystallisation from acetone to obtain a cocoa butter replacer. The crystallisation conditions were the same as in the case of the fat obtained with ISMN catalyst. The temperature of the first crystallisation was 22°C, and 2°C during the second one. Using spent catalyst, the replacer was obtained with the similar yield (over 60%) as with ISMN catalyst. The physical properties and chemical composition of both replacers were also similar. Applying fresh nickel catalyst, the cocoa butter replacer had similar physical properties but different chemical composition. The replacer contained about 10% higher amount of saturated fatty acids and nearly 20% less of trans isomers than the one obtained with sulfur-modified nickel catalysts. The results show that both fresh and spent nickel catalysts may be applied for the production of cocoa butter replacer.
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