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79-09-4

Basic Information
CAS No.: 79-09-4
Name: Propionic acid
Molecular Structure:
Molecular Structure of 79-09-4 (Propionic acid)
Formula: C3H6O2
Molecular Weight: 74.08
Synonyms: Propionicacid (6CI,8CI);Adofeed;Antischim B;Carboxyethane;Ethanecarboxylic acid;Ethylformic acid;Luprosil;Metacetonic acid;Methylacetic acid;MonoProp;Propcorn;Propkorn;Prozoin;Pseudoacetic acid;Toxi-Check;
EINECS: 201-176-3
Density: 1.019 g/cm3
Melting Point: -22 °C(lit.)
Boiling Point: 141.693 °C at 760 mmHg
Flash Point: 57.705 °C
Solubility: 37 g/100 mL in water
Appearance: Clear, colorless liquid
Hazard Symbols: CorrosiveC
Risk Codes: 36/37/38-34
Safety: 26-36-45-23
Transport Information: UN 3463 8/PG 2
PSA: 37.30000
LogP: 0.48100
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Chemistry

IUPAC Name: propanoic acid 
Empirical Formula: C3H6O2
Molecular Weight: 74.0785g/mol
EINECS: 201-176-3 
Structure of Propionic adid (CAS NO.79-09-4):

Index of Refraction: 1.397
Molar Refractivity: 17.51 cm3
Molar Volume: 72.6 cm3
Polarizability: 6.94×10-24cm3
Surface Tension: 32.3 dyne/cm
Density: 1.019 g/cm3
Flash Point: 57.7 °C
Enthalpy of Vaporization: 40.08 kJ/mol 
Melting Point: −24-−23 °C(lit.)
Boiling Point: 141.7 °C at 760 mmHg
Vapour Pressure: 4.23 mmHg at 25°C 
storage temp: 0-6°C
Water Solubility: 37 g/100 mL 
Stability: Stable. Incompatible with strong oxidizing agents. Flammable. 
Product Categories: Alkylcarboxylic Acids;Monofunctional & alpha,omega-Bifunctional Alkanes;Monofunctional Alkanes 
Canonical SMILES: CCC(=O)O
InChI: InChI=1S/C3H6O2/c1-2-3(4)5/h2H2,1H3,(H,4,5)
InChIKey: XBDQKXXYIPTUBI-UHFFFAOYSA-N

History

Propionic acid was first described in 1844 by Johann Gottlieb. Over the next few years, other chemists produced propionic acid in various other ways, none of them realizing they were producing the same substance. In 1847, the French chemist Jean-Baptiste Dumas established that all the acids were the same compound, which he called propionic acid,it was the smallest H(CH2)nCOOH acid that exhibited the properties of the other fatty acids, such as producing an oily layer when salted out of water and having a soapy potassium salt.

Uses

 Propionic acid can prepare the propionate ester for the use of spices,and it also can be used as solvents for cellulose nitrate and plasticizers, etc.

Production

In industry, propionic acid is mainly produced by the hydrocarboxylation of ethylene using nickel carbonyl as the catalyst:
H2C=CH2 + H2O + CO → CH3CH2CO2
It is also produced by the aerobic oxidation of propionaldehyde. In the presence of cobalt or manganese ns, this reaction proceeds rapidly at temperatures as mild as 40–50 °C:
CH3CH2CHO + 1/2O2 → CH3CH2COOH.

Toxicity Data With Reference

1.    

skn-rbt 495 mg open SEV

    UCDS**    Union Carbide Data Sheet. (Industrial Medicine and Toxicology Dept., Union Carbide Corp., 270 Park Ave., New York, NY 10017) 3/24 ,1970.
2.    

eye-rbt 990 μg SEV

    UCDS**    Union Carbide Data Sheet. (Industrial Medicine and Toxicology Dept., Union Carbide Corp., 270 Park Ave., New York, NY 10017) 3/24 ,1970.
3.    

orl-rat LD50:2600 mg/kg

    FAONAU    Food and Agriculture Organization of United Nations, Report Series. 53A (1974),110.
4.    

par-rat LD50:3500 mg/kg

    DOVEAA    Defense des Vegetaux. 26 (1972),5.
5.    

unr-rat LD50:1510 mg/kg

    GISAAA    Gigiena i Sanitariya. 35 (3)(1970),96.
6.    

ivn-mus LD50:625 mg/kg

    APTOA6    Acta Pharmacologica et Toxicologica. 18 (1961),141.
7.    

unr-mus LD50:1370 mg/kg

    GISAAA    Gigiena i Sanitariya. 35 (3)(1970),96.
8.    

skn-rbt LD50:500 mg/kg

    AIHAAP    American Industrial Hygiene Association Journal. 23 (1962),95.
9.    

ivn-rbt LDLo:1320 mg/kg

    FAONAU    Food and Agriculture Organization of United Nations, Report Series. 53A (1974),110.
10.    

unr-rbt LD50:1900 mg/kg

    GISAAA    Gigiena i Sanitariya.

Consensus Reports

Reported in EPA TSCA Inventory.

Safety Profile

Hazard Codes:  CorrosiveC
Risk Statements:  36/37/38-34
R36/37/38:Irritating to eyes, respiratory system and skin. 
R34:Causes burns.
Safety Statements:  26-36-45-23
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S23:Do not breathe vapour.
RIDADR:  UN 3463 8/PG 2
WGK Germany:  1
HazardClass:  8
PackingGroup:  II
Propionic acid is poisonous by intraperitoneal route,and it is moderately toxic by ingestion, skin contact, and intravenous routes. It is corrosive irritant to eyes, skin, and mucous membranes.Propionic acid is flammable liquid and highly flammable when exposed to heat, flame, or oxidizers. To fight fire, use alcohol foam. When heated to decomposition it emits acrid smoke and irritating fumes.

Standards and Recommendations

OSHA PEL: TWA 10 ppm
ACGIH TLV: TWA 10 ppm
DFG MAK: 10 ppm (31 mg/m3)
DOT Classification:  8; Label: Corrosive

Specification

  Propionic adid , its cas register number is 79-09-4. It also can be called 4-02-00-00695 (Beilstein Handbook Reference) ;
 AI3-04167 ; Acide propionique ; C3 acid ; CCRIS 6096 ; Carboxyethane ; Caswell No. 707 ; EPA Pesticide Chemical Code 077702 ; Ethanecarboxylic acid ; Ethylformic acid ; FEMA No. 2924 ; FEMA Number 2924 ; HSDB 1192 ; Kyselina propionova ; Luprosil ; Metacetonic acid ; Monoprop ; Propanoic acid ; Propionic acid grain preserver ; Propionoic acid ; Prozoin ; Pseudoacetic acid ; Sentry grain preserver ; Tenox P grain preservative ; UNII-JHU490RVYR . Propionic adid (CAS NO.11135-81-2) is a Clear, colorless liquid.