Glacial acetic acid-acetic acid

Chemical name: acetic acid

CAS accession number:64-19-7

Specifications:

Appearance:colorless transparent liquid with pungent smell

Chemical formula：CH3COOH

Molecular weight ：60.05

Density  g/cm3 ：1.05

Freezing point  ℃  ≥ ：57.21

Boiling point  ℃ ：118

Chloride(Cl)  ppm≤ ：3.6

Sulfate(SO4)  ppm ≤ ：19.6

Heavy metals(as Pb)  ppm ≤ ：10

Oxide ：qualified

Nonvolatile residue %  ≤ ： 0.01

Formaldehyde  ppm ≤ ：30

Arsenic  ppm≤  ：2

Assay  %  ≥ ： 99.0

Nature: colorless and transparent liquid, solidified into ice-like crystals at low temperature, with pungent smell; It is miscible with organic solvents such as water, ethanol, ether and carbon tetrachloride, and is insoluble in carbon disulfide. Flammable, corrosive and highly irritating, can cause burns to human body.

◆Application:In the food industry, acetic acid is used as an acidifier, flavoring agent and fragrance when making synthetic vinegar, the acetic acid is diluted to 4-5% with water, and various flavoring agents are added. The flavor is similar to that of alcoholic vinegar, and the manufacturing time is short and the price is cheap. As a sour agent, can be used for compound seasonings, preparation of vinegar, canned food, jelly and cheese, according to the production needs of appropriate use; You can also compose aroma enhancers for incense wine.

◆Storage method:Store in a cool and ventilated warehouse, away from fire; In winter, the storage temperature should be kept higher than 16 ℃ to prevent solidification and keep the container sealed. It should be stored separately from oxidant and alkali, and mixed storage should not be avoided.

What is glacial acetic acid

Acetic acid, also known as acetic acid (36%-38%), glacial acetic acid (98%), chemical formula CH3COOH, is an organic monic acid, the main component of vinegar. Pure anhydrous acetic acid (glacial acetic acid) is a colorless hygroscopic solid with a freezing point of 16.6 ° C (62 ° F) and becomes a colorless crystal after solidification. Its aqueous solution is weakly acidic and erosive, and the steam is irritating to the eyes and nose. High concentrations can corrode lesions, in the past, many self-prescribed drugs contain glacial acetic acid, and about 30% of the concentration is used for the treatment of gray nails. Glacial acetic acid can also treat verrucous lesions, but it is not very safe because other methods are being developed. Now public safety is very important, the clinical treatment has been basically banned, but the use of ice acetic acid to detect condyloma acuminatum is still used as a clinical inspection means.

Glacial acetogenesis

Acetic acid can be used as acidity regulator, acidifier, pickling agent, flavor enhancer, fragrance and so on. It is also a good antimicrobial agent, mainly due to its ability to reduce the pH below the pH required for optimal microbial growth. Acetic acid is the earliest and most used sour agent in China. It is mainly used in compound seasoning, preparation of wax, canned food, cheese, jelly and so on. When used in seasonings, acetic acid can be diluted with water to 4%~5% solution and added to a variety of seasonings. The beverage made of vinegar as a sour agent and supplemented by pure natural nutrition and health products is called the international third generation beverage.

Toxicological data

Acute toxicity: LD50:3.3 g/kg(rat transoral); 1060mg/kg(rabbit percutaneous). LC50:5620ppm, 1h(mouse inhalation); 12.3g/m3,1h (inhaled by rats). The minimum amount of intoxication was 1.47mg/kg in the mouth, and symptoms of digestive tract appeared. Human oral 20 ~ 50g, lethal dose. Acetic acid at 80% concentration can cause severe skin burns in guinea pigs, 50% to 80% produce moderate to severe burns, less than 50% is very mild, and 5% to 16% concentrations never cause burns. Human can not tolerate more than 3min in 2~3g/m3 concentration. The oral lethal dose for humans is 20-50g.

Subacute and chronic toxicity: When the concentration of this product is about 100mg/m3, the chronic effect can cause inflammation in the nose, nasopharynx, eyelid and throat of workers, and even cause bronchitis. People inhaled (200 ~ 490) mg/m3× (7 ~ 12) years, there are eyelid edema, conjunctival congestion, chronic pharyngitis, bronchitis and other symptoms.

Mutagenicity: Microbial mutagenicity: E. coli 300ppm(3h). Sister chromatid exchange: human lymphocytes 5mmol/L.

Reproductive toxicity: The lowest oral toxic dose (TDL0) of rats was 700mg/kg(18 days after delivery), which had an effect on the behavior of newborn rats. The lowest toxic dose (TDL0) in the testis of rats was 400mg/kg(1d, male), which had an effect on the male fertility index.

Health hazard: The way of invasion is inhalation, ingestion and transdermal absorption. Irritant to nose, throat and respiratory tract when inhaled. It has a strong irritating effect on the eyes. Skin contact, mild erythema, severe cause chemical burns. Ingestion of concentrated acetic acid can lead to erosion in the mouth and digestive tract, and death can be caused by shock in severe cases.

Chronic effects: eyelid edema, conjunctival congestion, chronic pharyngitis and bronchitis. Long-term repeated contact can cause dry skin, degreasing and dermatitis.

Environmental harm: It is harmful to the environment and can cause pollution to water.

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