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Hydrogenation is a chemical reaction between a compound and hydrogen. In the fine chemicals industry, hydrogenation is commonly performed in a fixed-bed catalytic reactor.
The hydrogenation process increases the melting point of the fat, which changes liquid oil into solid shortening. This process stops the decomposition or rancidity of unsaturated fats. By controlling the degree of hydrogenation, it is possible to control the melting profile of the fats.