402907

Propionic acid

ACS reagent, ≥99.5%

• Sinonimo/i: Acid C₃, Propanoic acid, Propanyl acid
• Formula condensata: CH₃CH₂COOH
• Numero CAS: 79-09-4
• Peso molecolare: 74.08
• Beilstein: 506071
• Numero CE: 201-176-3
• Numero MDL: MFCD00002756
• Codice UNSPSC: 12352100
• eCl@ss: 39021305
• ID PubChem: 24865136
• NACRES: NA.21

Proprietà

• Grado: ACS reagent
• Livello qualitativo: 200
• Densità del vapore: 2.55 (vs air)
• Tensione di vapore: 2.4 mmHg ( 20 °C)
• Saggio: ≥99.5%
• Forma fisica: liquid
• Temp. autoaccensione: 955 °F
• Limite di esplosione: 12.1 %
• Classi chimiche degli analiti: amino acids
• Impurezze: ≤0.002% Carbonyl compounds; ≤0.10% Readily oxidizable substances (as HCOOH); ≤0.15% water
• Residuo dopo evaporazione: ≤0.01%
• Colore: APHA: ≤20
• Indice di rifrazione: n20/D 1.386 (lit.)
• P. eboll.: 141 °C (lit.)
• Punto di fusione: −24-−23 °C (lit.)
• Solubilità: H₂O: soluble
• Densità: 0.993 g/mL at 25 °C (lit.)
• Cationi in tracce: heavy metals (as Pb): ≤0.001%
• Stringa SMILE: CCC(O)=O
• InChI: 1S/C3H6O2/c1-2-3(4)5/h2H2,1H3,(H,4,5); XBDQKXXYIPTUBI-UHFFFAOYSA-N

Descrizione

Descrizione generale

Propionic acid (PA) also known as propanoic acid is a short chain fatty acid mainly used as food preservative. It is one of the main metabolic end product formed during the fermentation of undigested food in the colon by the microbiota. Its manufacture by glycerol/glucose co-fermentation using Propionibacterium acidipropionici has been reported. Crystal structure study reveals that PA crystals are monoclinic with space group P2₁/c.

Propionic acid (PA) is a naturally occurring carboxylic acid, which in its pure state exists as a colorless corrosive liquid with an unpleasant odor. It is miscible in water. Industrially it is produced by hydrocarboxylation of ethylene in presence nickel carbonyl as a catalyst. PA has been found to reduce food intake, lower the fatty acids content in plasma and liver, might improve tissue insulin sensitivity and exerts immunosuppressive actions. Propionic acid is an excellent raw material as it is stable, cheap and safe and can even be used as a food additive.

Applicazioni

Propionic acid may be used to alter limestone in order to increase its ability of CO₂ uptake.

Informazioni sulla sicurezza

• Pittogrammi: GHS02,GHS05,GHS07
• Avvertenze: Danger
• Indicazioni di pericolo: H226,H314,H335
• Consigli di prudenza: P210 - P233 - P240 - P280 - P303 + P361 + P353 - P305 + P351 + P338
• Classi di pericolo: Eye Dam. 1 - Flam. Liq. 3 - Skin Corr. 1B - STOT SE 3
• Organi bersaglio: Respiratory system
• Codice della classe di stoccaggio: 3 - Flammable liquids
• Classe di pericolosità dell'acqua (WGK): WGK 1
• Punto d’infiammabilità (°F): 129.2 °F - closed cup
• Punto d’infiammabilità (°C): 54 °C - closed cup
• Dispositivi di protezione individuale: Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter