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What is the purpose of palm oil deodorization?

September 17, 2021

palm oil deodorization

    Pure triglycerides (TG) are odorless. However, the various crude oils obtained by processing have different degrees of so-called "natural gas smell". Some are loved by people, such as sesame oil and peanut oil; most are unpopular, especially the peculiar smell caused by rancidity and deterioration during processing and storage. These smells are collectively called bad smells. Generally, although the content in oil is very small (except for FFA, it only accounts for about 0.1% of the oil weight), but there are many types and complex compositions. Its main components are nothing more than low-molecular aldehydes, ketones, alcohols, FFA, unsaturated hydrocarbons, solvents, etc. These substances are harmful and unhealthy to the human body, so remove them well. Therefore, palm oil refining and deodorization process is used.

    In the oil deodorization process, in addition to the purpose of deodorization, the current focus is on achieving unit operation at low temperature and short time, inhibiting the production of trans fatty acids, reducing the loss of tocopherols, reducing polymerization, and reducing vitamins (A , D, E) Decomposition. The temperature is 230~250. In order to prevent oxidation, it must be degassed before entering the deodorization tower. Direct steam is used to speed up the deodorization effect. The heat recovery can be achieved by the heat exchange between cold oil and hot oil.