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Oleic acid is divided into two types: plant oleic acid and animal oleic acid, with animal oleic acid being the best quality. In addition, petroleum olefins can also be used to produce oleic acid, which is currently less commonly used. Refined high-purity oleic acid appears as a colorless to light yellow oily liquid, while industrial products are mostly in the form of paste or fat. The components of various oleic acids are not completely the same, and there are significant differences in indicators such as iodine value, acid value, and freezing point. The color and odor also vary greatly, and the price also varies accordingly. Oleic acid contains active double bonds and is easily oxidized by air, resulting in a bad odor and yellowing in color. Refined vegetable oleic acid is a light colored transparent liquid with a low pour point of industrial oleic acid. It is a greasy and layered oil at room temperature, commonly referred to as Distilled Tall Oil (DTO). Commonly used grades generally contain about 70% of Tall oil fatty acids, about 30% of rosin acid, and some unsaponifiable substances, thus greatly different in properties from oleic acid. In addition, pine trees from different regions, such as those in the cold, subtropical, and tropical regions, have different DTO performance.
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