كربن زدايي از كتاليس نيكل مستعمل در فرآيند هيدردژناسيونروغن هاي نباتي

Decolcing Of Deactivated Nickel Catalyst used In Hydrogenation Process Of Liquid Oils

Nickel Catalyst is used in hydrogenation process of triply cerides in Liquid cooking oils such as soybean, palm, peanut, canola and sunflower. The hydrogenation process has three phase, oil, hydrogen gas and solid Nickel Catalyst Particles. Hydrogenation is widely nude to alter properties of oils namely oxidative stability and melting characteristics. After some time Catalyst deactivates by poisons in oil and hydrogen gas, and required reclamation of Nickel from spent Nickel Catalyst. As an important step to regenerate the Catalyst, the gas frication process is needed to eliminate carbon black residues remaining on the surface of the Catalyst. In this research the spent Catalyst was decarbouited using air by twos methods. A number of experiments were carried to show that 45 weight percent of deactivated Catalyst contained Carbon black, remaining oil and some by products of deactivation process. Also, A series of batch experiments were commented to determine the optimum Combustion temperature of 450°` . It was observed that in this method the remaining oil in Catalyst was combusted and produced a lot of smokes. In another method, a lot of experiments were used to solve, the remaining oil in the catalyst using carbon Tetrachloride solvent. After drying these samples, the gasification process was followed up. As a result, it was shown that in this method 23 weight percent of catalyst contained oil and 22 weight of percent the deactivated catalyst contained coke and other by products.