What are the properties and uses of linoleic acid? Introduction of linoleic acid

[alias] octadeca-9,12-dienoic acid, cis octadeca-9,12-diene Acid, close acid

[Molecular formula]C18H32O2

[Structural formula]CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH

[Property] Linoleic acid is an unsaturated higher aliphatic dienoic acid, pure product is colorless liquid, industrial product It is light yellow, relative density 0.9025 (20°C), melting point -5°C, boiling point 129°C (2.67Pa), 224°C (1.333kPa), 228°C (1.866kPa), 230°C (2.133kPa), and refractive index 1.4699 (20 ℃). Iodine value 181.1, acid value 200. Insoluble in water, easily soluble in ether and petroleum ether, soluble in absolute ethanol, chloroform and benzene, and miscible with dimethylformamide and oil solvents. It is easily oxidized and polymerized in air. When treated with nitrogen oxides, it transforms into elanoleic acid, and becomes stearic acid by catalytic hydrogenation. It is easy to oxidize, and antioxidants (tert-butyl p-hydroxyanisole) should be added during storage. Linoleic acid exists in many animal and vegetable oils in the form of glycerides, safflower oil contains about 75%, linseed oil contains about 45%, corn oil contains about 40%, and animal fat contains about 2%-4%.

［Application］It is an important raw material for the manufacture of paints and inks, and is also used in the production of polyester, polyamide and polyurea, etc. Used in the manufacture of emulsifiers, driers and other products. Refined linoleic acid is esterified with methanol and hydrogenated to produce unsaturated fatty alcohols, which can be used as raw materials for various surfactants, detergents, shampoos and other cosmetics. Linoleic acid has the effect of lowering cholesterol and blood lipids in human blood, and can be used to manufacture drugs for treating hyperlipidemia, hypercholesterolemia and arteriosclerosis. Linoleic acid is an essential fatty acid in human and animal nutrition, and is a precursor for the synthesis of prostaglandins. When it is deficient, it will cause symptoms such as dysplasia and rough skin.

［Brief Method］ Mixed fatty acids obtained from vegetable oils through saponification and acidification, and then freeze-separated and refined to obtain finished linoleic acid . It can also be prepared by saponification, salting out, acidification, water washing, freezing separation and rectification by using the by-products such as oil foot or soap foot remaining from soybean oil refining.

[Safety and Protection]This product is non-toxic. Packed in aluminum drum or stainless steel drum, each drum has a net weight of 200kg. Store and transport according to general chemical regulations, store in a cool and ventilated place, away from fire sources.