Do you know the use of sorbic acid? Properties and uses of sorbic acid

[alias]2,4-Hexadienoic Acid, Aranoic Acid, Herbal Acid, 2-Propyl Acrylic Acid

[Molecular formula]C6H8O2

[Structural formula]CH3CH=CHCH—CHCOOH

［Property］Colorless acicular crystal or white crystalline powder, with a slight special smell, can be sublimated, and can also volatilize with water vapor . The relative density is 1.204 (19°C), the melting point is 132-135°C, the boiling point is 228°C (decomposition), and the flash point (open cup) is 127°C. Slightly soluble in water, 0.16g dissolved in 100mL water at 20°C, 3.8g at 100°C.

Soluble in ethanol, methanol, acetone, isopropanol, glacial acetic acid, acetic acid and other organic solvents, the pH value of saturated aqueous solution is 3.6. It is stable to light and heat, but it will be colored due to oxidation when it is placed in the air for a long time. It has an inhibitory effect on some aerobic bacteria such as yeast and mold, but it is almost ineffective against anaerobic spore-forming bacteria and Lactobacillus acidophilus. Its growth-inhibiting effect is stronger than the bactericidal effect, and it is an acid-type preservative. The antiseptic effect decreases with the increase of pH value, but its antiseptic ability is not limited by the type of food. Because of its low solubility in water, it should be dissolved in ethanol or sodium carbonate solution before adding it to food. Do not use iron or copper containers when dissolving.

[Quality Specifications]

National Standard GB1905—1989

Appearance:Colorless crystal or white crystalline powder

Sorbic acid content: 98.5%

Melting point: 132-135℃

Sulfate (as Pb):0.1%

Ignition residue: 0.1%

Heavy metals (calculated as Pb):0.001%

Arsenic (As):0.0002%

［Application］ Sorbic acid is a raw material for organic synthesis, used to make sorbate, and also used to make rubber additives and plasticizers Agents, lubricants, pharmaceuticals. It is a high-grade non-toxic anti-corrosion and anti-fungal agent. Used for antisepsis of human food, animal feed, cosmetics, pharmaceuticals and packaging materials. When used as cosmetics, pharmaceuticals and food preservatives, the specifications and standards should be more than 99% purity, and the heavy metal content and other indicators should meet the hygienic standards of food additives in my country. It can be used in soy sauce, jam, dairy products, wine, beverages, canned and pickled foods, etc. Its toxicity is only a quarter of that of benzoic acid. Usually, in order to increase its solubility, its potassium salt is often used. It can also be used in combination with other preservatives or additives. It can also be used for disinfection of food utensils.

[Brief recipe]

①Acetic acid is cracked at high temperature to generate ketene, and then condensed with crotonaldehyde in the presence of catalysts such as zinc chloride, aluminum chloride, and boron trifluoride. have to.

②Using crotonaldehyde and malonic acid as raw materials, it is prepared by condensation in pyridine solution and then decarboxylation and recrystallization.

[Safety and Protection]This product is low in toxicity. Packed in a woven bag lined with a plastic bag, with a net weight of 1KG and 5kg, stored and transported according to the regulations for general chemicals, and stored in a cool and dry place.