Acetic acid is a clear, colorless, organic liquid with a pungent odor similar to household vinegar. Acetic acid has a variety of uses, including as a raw material and solvent in the production of other chemical products, oil and gas production, and in food and pharmaceutical industries.
Uses & Benefits
One of the most common ways consumers may come into contact with acetic acid is in the form of household vinegar, which is naturally made from fermentable sources such as wine, potatoes, apples, grapes, berries and grains. Vinegar is a clear solution generally containing about 5 percent acetic acid and 95 percent water. Vinegar is used as a food ingredient and can also be an ingredient in personal care products, household cleaners, pet shampoos and many other products for the home:
- Food Preparation: Vinegar is a common food ingredient, often used as a brine in pickling liquids, vinaigrettes, marinades and other salad dressings. Vinegar also can be used in food preparation to help control Salmonella contamination in meat and poultry products.
- Cleaning: Vinegar can be used throughout the home as a window cleaner, to clean automatic coffee makers and dishes, as a rinsing agent for dishwashers, and to clean bathroom tile and grout. Vinegar can also be used to clean food-related tools and equipment because it generally does not leave behind a harmful residue and requires less rinsing.
- Gardening: In concentrations of 10 to 20 percent, acetic acid can be used as a weed killer on gardens and lawns. When used as an herbicide, the acetic acid can kill weeds that have emerged from the soil, but does not affect the roots of the weed, so they can regrow.
When acetic acid is at 99.5 percent concentration, it is referred to as glacial acetic acid. Glacial acetic acid has a variety of uses, including as a raw material and solvent in the production of other chemical products.
Industrial applications for glacial acetic acid include:
- Vinyl Acetate, cellulose fibers and plastics: Acetic acid is used to make many chemicals, including vinyl acetate, acetic anhydride and acetate esters.
- Vinyl acetate is used to make polyvinyl acetate, a polymer used in paints, adhesives, plastics and textile finishes.
- Acetic anhydride is used in the manufacture of cellulose acetate fibers and plastics used for photographic film, clothing and coatings.
- Acetic acid is also used in the chemical reaction to produce purified terephthalic acid (PTA), which is used to manufacture the PET plastic resin used in synthetic fibers, food containers, beverage bottles and plastic films.
- Solvents: Acetic acid is a hydrophilic solvent, similar to ethanol. It dissolves compounds such as oils, sulfur and iodine and mixes with water, chloroform and hexane.
- Acidizing oil and gas: Acetic acid can help reduce metal corrosion and scale build-up in oil and gas well applications. It is also used in oil well stimulation to improve flow and increase production of oil and gas.
- Pharmaceuticals and vitamins: The pharmaceutical industry uses acetic acid in the manufacture of vitamins, antibiotics, hormones and other products.
- Food Processing: Acetic acid is commonly used as a cleaning and disinfecting product in food processing plants.
- Other uses: Salts of acetic acid and various rubber and photographic chemicals are made from acetic acid. Acetic acid and its sodium salt are commonly used as a food preservative.
Acetic Acid is a synthetic carboxylic acid with antibacterial and antifungal properties. Although its mechanism of action is not fully known, undissociated acetic acid may enhance lipid solubility allowing increased fatty acid accumulation on the cell membrane or in other cell wall structures. Acetic acid, as a weak acid, can inhibit carbohydrate metabolism resulting in subsequent death of the organism.
Answering Questions
What is the difference between acetic acid, glacial acetic acid and vinegar?
Acetic acid in its pure form (99.5 percent concentration) is also known as glacial acetic acid. Glacial acetic acid has numerous industrial uses. Vinegar contains 4 to 8 percent acetic acid, and is made from the fermentation of fruit or grain juices/liquids.
Is acetic acid hazardous to the environment?
According to the information considered under the Ecological Risk Classification of Organic Substances Approach, acetic acid is identified as having a low ecological hazard potential.
How likely am I to be exposed to acetic acid?
Consumer exposure to acetic acid is usually limited to vinegar, which is a solution containing 5 percent acetic acid and not hazardous in that form. Occupational exposure to glacial acetic acid can be hazardous, and precautions should be taken to limit exposure through inhalation, and skin and eye contact.
Can vinegar be used as a household disinfectant?
Vinegar can be used to clean some household surfaces and glass as its acidic properties can help dissolve dirt, grease and grime. However, there is a difference between cleaning and disinfecting. Vinegar is not an EPA-registered household disinfectant and may not be as effective for killing pathogens.
Can vinegar be used as an antimicrobial to kill the novel coronavirus?
EPA does not review the effectiveness of common household ingredients like vinegar, and cannot verify how well it will work to kill the novel coronavirus that causes COVID-19.
Acetic acid is a simple monocarboxylic acid containing two carbons. It has a role as a protic solvent, a food acidity regulator, an antimicrobial food preservative and a Daphnia magna metabolite. It is a conjugate acid of an acetate.
Acetic acid, glacial appears as a clear colorless liquid with a strong odor of vinegar. Flash point 104°F. Density 8.8 lb / gal. Corrosive to metals and tissue. Used to make other chemicals, as a food additive, and in petroleum production.
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