It is an organic compound with the chemical formula CH3COOH. It is an organic monobasic acid and is the main component of vinegar. Pure anhydrous acetic acid (glacial acetic acid) is a colorless hygroscopic liquid with a freezing point of 16.6°C (62°F). It turns into colorless crystals after solidification. Its aqueous solution is weakly acidic and highly corrosive, and is highly corrosive to metals. Steam can be irritating to eyes and nose
Industrial applications
1. Acetic acid is a bulk chemical product and one of the most important organic acids. acetate and cellulose acetate. Polyvinyl acetate can be made into films and adhesives, and is also the raw material for synthetic fiber vinylon. Cellulose acetate is used to make rayon and motion picture film.
2. Acetate ester formed from lower alcohol is an excellent solvent and is widely used in the paint industry. Because acetic acid dissolves most organic matter, acetic acid is also a commonly used organic solvent (for example, used in the oxidation of paraxylene to produce terephthalic acid).
3. Acetic acid can be used in some pickling and polishing solutions, as a buffer in weakly acidic solutions (such as zinc plating, chemical nickel plating), as an additive in semi-bright nickel plating electrolyte, and in the passivation of zinc. The solution can improve the binding force of the passivation film and is often used to adjust the pH of weakly acidic plating solutions.
4. Used to produce acetate, such as salts of manganese, sodium, lead, aluminum, zinc, cobalt and other metals, which are widely used as catalysts and additives in fabric dyeing and leather tanning industries; Lead tetraacetate is an organic synthesis reagent (for example, lead tetraacetate can be used as a strong oxidant, provide a source of acetoxy groups, and prepare organic lead compounds, etc.).
5. Acetic acid can also be used as analytical reagents, organic synthesis, synthesis of pigments and pharmaceuticals.
food use
In the food industry, acetic acid is used as an acidifier, flavoring agent and spice. When making synthetic vinegar, dilute the acetic acid with water to 4-5% and add various flavoring agents. The flavor is similar to that of alcohol-made vinegar, and the production time is short and the price is low. Cheap. As a sour agent, it can be used in compound seasonings to prepare vinegar, canned food, jelly and cheese. It can be used in appropriate amounts according to production needs. It can also be used as a flavor enhancer for Quxiang wine, with a dosage of 0.1 to 0.3 g/kg.
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