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Peroxyacetic acid

Peracetic acid
Peroxyacetic acid
Peroxyacetic acid
Names
Preferred IUPAC name
Ethaneperoxoic acid
Other names
Peracetic acid
Peroxyacetic acid
Acetic peroxide
Acetyl hydroperoxide
Proxitane
Identifiers
3D model (Jmol)
Abbreviations PAA
ChemSpider
ECHA InfoCard 100.001.079
KEGG
PubChem CID
RTECS number SD8750000
UNII
Properties
C2H4O3
Molar mass 76.05 g/mol
Appearance Colorless liquid
Density 1.0375 g/mL
Melting point 0 °C (32 °F; 273 K)
Boiling point 25 °C (77 °F; 298 K) (1.6 kPa)
Acidity (pKa) 8.2
1.3974 (589 nm, 20 °C)
Viscosity 3.280 cP
Pharmacology
QG51AD03 (WHO)
Hazards
Oxidant (O)
Corrosive (C)
Dangerous for the environment (N)
R-phrases R8 R5 R11 R25 R34
S-phrases (S1/2) S3/7 S14 S36/37/39 S45 S61
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuel Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g., phosphorus Special hazard OX: Oxidizer. E.g., potassium perchlorateNFPA 704 four-colored diamond
Flash point 40.5 °C (104.9 °F; 313.6 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY  (what is YesYN ?)
Infobox references

Peracetic acid (also known as peroxyacetic acid, or PAA), is an organic compound with the formula CH3CO3H. This organic peroxide is a colorless liquid with a characteristic acrid odor reminiscent of acetic acid. It can be highly corrosive.

Peracetic acid is a weaker acid than the parent acetic acid, with a pKa of 8.2.

Peracetic acid is produced industrially by the autoxidation of acetaldehyde:

It forms upon treatment of acetic acid with hydrogen peroxide:

As an alternative, acetyl chloride and acetic anhydride can be used to generate a solution of the acid with lower water content.

Peracetic acid is generated in situ by some laundry detergents. This route involves the reaction of tetraacetylethylenediamine (TAED) in the presence of an alkaline hydrogen peroxide solution The peracetic acid is a more effective bleaching agent than hydrogen peroxide itself. PAA is also formed naturally in the environment through a series of involving formaldehyde and photo-oxidant radicals.

Peracetic acid is always sold in solution with acetic acid and hydrogen peroxide to maintain the stability of the peracid. The concentration of the acid as the active ingredient can vary.

The United States Environmental Protection Agency first registered peracetic acid as an antimicrobial in 1985 for indoor use on hard surfaces. Use sites include agricultural premises, food establishments, medical facilities, and home bathrooms. Peracetic acid is also registered for use in dairy/cheese processing plants, on food processing equipment, and in pasteurizers in breweries, wineries, and beverage plants. It is also applied for the disinfection of medical supplies, to prevent biofilm formation in pulp industries, and as a water purifier and disinfectant. Peracetic acid can be used as a cooling tower water disinfectant, where it prevents bio film formation and effectively controls Legionella bacteria. A trade name for peracetic acid as an antimicrobial is Nu-Cidex.


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