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The Difference Between Stearic Acid, Palmitic Acid, and Oleic Acid

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The scientific name of palmitic acid is "hexadecanoic acid," also known as palmitic acid. It is a saturated higher fatty acid with white pearly scales. Insoluble in water, slightly soluble in the petroleum ether, soluble in ethanol. Easily soluble in ether, chloroform, and acetic acid. It is widely found in nature, and almost all oils and fats contain varying amounts of palmitic acid. They are used as precipitants, chemical reagents, and waterproofing agents.

Stearic acid, namely octadecanoic acid, has a structural formula: CH3(CH2)16COOH, produced by the hydrolysis of fats and oils, and is mainly used to create stearates. Each gram is dissolved in 21ml ethanol, 5ml benzene, 2ml chloroform, or 6ml carbon tetrachloride.

Oleic acid is a monounsaturated Omega-9 fatty acid found in animals and plants. The chemical formula is C18H34O2 (or CH3(CH2)7CH=CH(CH2)7COOH). Hydrogenation of oleic acid to obtain stearic acid. The double bond trans isomer of oleic acid is called elaidic acid.

The difference between stearic acid, palmitic acid, and oleic acid

1. Different molecular formula

Stearic acid: The molecular formula of stearic acid is CHO.

Palmitic acid: The molecular formula of palmitic acid is CHO.

Oleic acid: The molecular formula of oleic acid is CHO.

2. Different density

Stearic acid: The density of stearic acid is 0.9408.

Palmitic acid: The density of palmitic acid is 0.8527.

Oleic acid: The density of oleic acid is 0.8910.

3. Different boiling points

Stearic acid: The boiling point of stearic acid is 183-184C.

Palmitic acid: The boiling point of palmitic acid is 351.5C.

Oleic acid: The boiling point of oleic acid is 350-360°C.

Stearic acid is carbon octadecanoic acid, palmitic acid is carbon hexadecanoic acid, and oleic acid is carbon eighteen with a double bond.

The most significant difference is that the industrial products of stearic acid and palmitic acid are reliable, while oleic acid is liquid.


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