Colorless liquid acetic acid CAS 64-19-7 acetic acid
Redox reactions
Reduction reaction
Acetic acid can be reduced to acetaldehyde by lithium aluminum hydride.
Oxidation reaction
The combustion reaction of acetic acid is an oxidation reaction in a broad sense and the complete combustion of acetic acid will generate carbon dioxide and water vapor.
Substitution reaction
Esterification
Acetic acid and ethanol can undergo esterification under the catalysis of concentrated sulfuric acid and heating to generate ethyl acetate.
α-H halogenation reaction
In the presence of red phosphorus, halogen and acetic acid can undergo α-H halogenation reaction. For example, acetic acid reacts with chlorine gas under the action of red phosphorus to form chloroacetic acid
Dehydration reaction
Acetic acid can undergo an intermolecular dehydration reaction. One acetic acid molecule will remove an -OH group, while another acetic acid molecule will remove an H, and finally acetic anhydride is formed.
Reacts with phosphorus trichloride
Heating of acetic acid and phosphorus trichloride can cause substitution reaction, the reaction can generate acetyl chloride and phosphorous acid
The following is the national standard of the People’s Republic of China on industrial acetic acid:
Item |
Specific |
||
Grade |
Premium |
First grade |
Qualified |
Chroma,Hazen Units (Platinum-Cobalt) ≤ |
10 |
20 |
30 |
Acetic acid content % ≥ |
99.8 |
99.0 |
98.0 |
Moisture % ≤ |
0.15 |
- |
- |
Formic acid content % ≤ |
0.06 |
0.15 |
0.35 |
Acetaldehyde content % ≤ |
0.05 |
0.05 |
0.10 |
Evaporation residue % ≤ |
0.01 |
0.02 |
0.03 |
Iron content (as Fe)% ≤ |
0.00004 |
0.0002 |
0.0004 |
Reduction of potassium permanganate substances min ≥ |
30 |
5 |
- |
Food industry application
In the food industry, acetic acid is used as an acidulant, flavoring agent and flavoring agent in the manufacture of synthetic vinegar,dilute acetic acid to 4-5% with water, add various flavoring agents, the flavor is similar to that of alcohol,the manufacturing time is short and the price is cheap.As a sour agent, it can be used in compound seasonings, in the preparation of vinegar, canned food, jelly and cheese,using in moderation according to production needs.It can also be used as a flavor enhancer for koji wine, and the dosage is 0.1 to 0.3 g/kg.
Chemical formula: CH3COOH
Appearance: Colorless transparent liquid with pungent odor
Particular weight: 60.05
CAS: 64-19-7
EINECS: 231-791-2
Melting point: 16.6 ℃
Boiling point: 117.9 ℃
Water soluble: Dissolved in water
Density: 1.05 g/cm³
Flash point: 39 ℃
UN No.: 2790
First aid
Skin Contact: Skin Contact Rinse with water, then wash thoroughly with soap.
Eye contact: Rinse the eyes with water, and then wipe with a dry cloth. In severe cases, send to the hospital for diagnosis and treatment.
Inhalation: If inhalation of vapors will keep patient out of contaminated area, place patient at rest and keep warm.
Ingestion: Rinse mouth immediately after swallowing, give emetic to induce vomiting, and urgently send to hospital for diagnosis and treatment.
Protective measures
Respiratory system protection: When the deep concentration in the air exceeds the standard, a gas mask should be worn.
Eye Protection: Wear chemical safety goggles.
Hand Protection: Wear rubber gloves.
Others: After work, shower and change, do not bring work clothes into the living area