Products Description of Propionic Acid CAS#79-09-4
Propionic acid, also known as primary oleic acid, is a saturated monocarboxylic acid containing three carbon atoms and belongs to the group of typical volatile lower fatty acids. Its chemical formula is CH₃CH₂COOH, with a molecular weight of 74.08. It appears as a colorless, transparent, oily liquid with a characteristic unpleasant rancid odor.
Propionic acid has a melting point of -20.8°C, a boiling point of 140.99°C, a boiling point of 41.65°C at 1330 Pa, a relative density of 0.9930, and a refractive index of 1.3869. Its acid dissociation constant (Ka) is 1.34 × 10⁻⁵. It is completely miscible with water and soluble in organic solvents such as alcohol, chloroform, and ether. Due to its active chemical properties and acidity, propionic acid can participate in various reactions, including salt formation, esterification, and reduction reactions.
Parameters
| 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) |
| refractive index | n20/D 1.386(lit.) |
| FEMA | 2924 | PROPIONIC ACID |
| Fp | 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 |
| biological source | synthetic |
| Odor Threshold | 0.0057ppm |
| explosive limit | 2.1-12%(V) |
| Water Solubility | 37 g/100 mL |
| JECFA Number | 84 |
| Merck | 147825 |
| 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℃ |
| Surface tension | 24.07mN/m at 298.15K |
| 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) |
| Hazard Codes | C |
| Risk Statements | 36/37/38-34-10 |
| Safety Statements | 26-36-45-23 |
| RIDADR | UN 3463 8/PG 2 |
| OEB | A |
| OEL | TWA: 10 ppm (30 mg/m3), STEL: 15 ppm (45 mg/m3) |
| 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) |
