Propionic acid , ACSreagent,≥99.5% , 79-09-4
Synonym(s):
Acid C3;Methyl acetic acid;Propanoic acid;Propanyl acid;Propionic acid
CAS NO.：79-09-4
Empirical Formula: C3H6O2
Molecular Weight: 74.08
MDL number: MFCD00002756
EINECS: 201-176-3
PRODUCT Properties
| Melting point: | −24-−23 °C(lit.) |
| Boiling point: | 141 °C(lit.) |
| Density | 0.993 g/mL at 25 °C(lit.) |
| vapor density | 2.55 (vs air) |
| vapor pressure | 2.4 mm Hg ( 20 °C) |
| FEMA | 2924 | PROPIONIC ACID |
| refractive index | n |
| Flash point: | 125 °F |
| storage temp. | Store below +30°C. |
| solubility | organic solvents: soluble(lit.) |
| pka | 4.86(at 25℃) |
| form | Liquid |
| Specific Gravity | 0.996 (20/4℃) |
| color | ≤10, APHA: |
| PH | 3.96(1 mM solution);3.44(10 mM solution);2.94(100 mM solution); |
| Odor | at 0.10 % in propylene glycol. pungent acidic cheesy vinegar |
| Odor Type | acidic |
| explosive limit | 2.1-12%(V) |
| Odor Threshold | 0.0057ppm |
| Water Solubility | 37 g/100 mL |
| JECFA Number | 84 |
| Merck | 14,7825 |
| BRN | 506071 |
| Exposure limits | TLV-TWA 10 ppm (～30 mg/m3) (ACGIH). |
| Dielectric constant | 3.2（Ambient） |
| Stability: | Stable. Incompatible with strong oxidizing agents. Flammable. |
| InChIKey | XBDQKXXYIPTUBI-UHFFFAOYSA-N |
| LogP | 0.33 at 25℃ |
| CAS DataBase Reference | 79-09-4(CAS DataBase Reference) |
| NIST Chemistry Reference | Propanoic acid(79-09-4) |
| EPA Substance Registry System | Propionic acid (79-09-4) |
Description and Uses
First described by Johann Gottlieb in 1844, propanoic acid has become one of the most widely used additives in processed foods for human consumption and animal feedstocks. Originally, Gottlieb found the compound among the degradation products of certain sugars. The term – propionic acid – itself has the unique distinction of once being the designation for all fatty acids due to the writings of Jean-Baptiste Dumas, who, in 1847, postulated that all fatty acids were in reality just one compound. While larger chain fatty acids are important components of all living things, propionic acid is the shortest fatty acid that exhibits the classic behaviors of similar compounds.
Propionic acid is used in the productionof propionates used as mold inhibitors andpreservatives for grains and wood chips, inthe manufacture of fruit flavors and perfumebases, and as an esterifying agent.
Safety
| Symbol(GHS) |    GHS02,GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H226-H314-H335 |
| Precautionary statements | P210-P233-P240-P280-P303+P361+P353-P305+P351+P338 |
| Hazard Codes | C |
| Risk Statements | 36/37/38-34-10 |
| Safety Statements | 26-36-45-23 |
| OEB | A |
| OEL | TWA: 10 ppm (30 mg/m3), STEL: 15 ppm (45 mg/m3) |
| RIDADR | UN 3463 8/PG 2 |
| WGK Germany | 1 |
| RTECS | UE5950000 |
| Autoignition Temperature | 955 °F |
| TSCA | Yes |
| HazardClass | 8 |
| PackingGroup | II |
| HS Code | 29155010 |
| Hazardous Substances Data | 79-09-4(Hazardous Substances Data) |
| Toxicity | LD50 orally in rats: 4.29 g/kg (Smyth) |
