Home Categories Organic Chemistry Propionic acid
A6696112

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

Update time: 2022-07-08

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)
refractive index  n20/D 1.386(lit.)
FEMA  2924 | PROPIONIC ACID
Flash point: 125 °F
storage temp.  Store below +30°C.
solubility  organic solvents: soluble(lit.)
form  Liquid
pka 4.86(at 25℃)
color  ≤10, APHA:
Specific Gravity 0.996 (20/4℃)
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
Odor Threshold 0.0057ppm
explosive limit 2.1-12%(V)
Water Solubility  37 g/100 mL
Merck  14,7825
JECFA Number 84
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℃

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
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
Toxicity LD50 orally in rats: 4.29 g/kg (Smyth)

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