Products Description of Propionic acid CAS#79-09-4
Propionic acid, also called propanoic acid, is a saturated monocarboxylic acid with three carbon atoms and a typical volatile low-molecular-weight fatty acid. Its chemical formula is CH₃CH₂COOH, and its molecular weight is 74.08. It presents as a colorless, clear oily liquid with an unpleasant rancid odor. Key physical constants include a melting point of -20.8°C, a boiling point of 140.99°C (and 41.65°C at 1330Pa), a relative density of 0.9930, and a refractive index of 1.3869. Its acid dissociation constant (Ka) is 1.34 × 10⁻⁵.
Propionic acid is miscible with water and soluble in organic solvents such as alcohol, chloroform, and ether. It exhibits high chemical reactivity, possesses acidic properties, and can undergo various reactions including salification, esterification, and reduction (per Chemicalbook).
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 | 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℃ |
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) |
Safety Information
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) |
Products Description of Propionic acid CAS#79-09-4
Carbonyl compounds, organic acids, preservatives, preservatives and insecticides, food additives, feed additives, feed storage additives, carboxylic acids, organic raw materials, phenoxycarboxylic acid and aryloxyphenoxycarboxylic acid herbicides, herbicide intermediates, pesticide intermediates, fatty acids, mildew inhibitors, chemical fine chemical intermediates, organic solvent chemical products, organic chemical raw materials, bactericides, main products, acrylates, building blocks, analytical standards, standard substances, HPLC and LC-MS mobile phase additives, gas chromatography standards (color scale), food and beverage standards, plant biochemical extracts, biochemical reagents, daily chemical raw materials, inorganic acids, pharmaceutical, pesticide and dye intermediates, chemical materials, organic carboxylic acids and their derivatives, traditional Chinese medicine reference substances, propionic acid, synthetic fragrances, synthetic drug intermediate raw materials, carboxylic acid-based organic chemical raw materials, carboxylic acids and their derivatives, chemical industry, acids, organic chemicals, flavors and fragrances, impurity reference substances, chemical raw materials, basic organic reagents
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