Propionaldehyde

  • Propanal
  • Methylacetaldehyde
  • Propionic aldehyde
Formula
CH3CH2CHO
Structure
Description
A clear colorless liquid with an overpowering fruity-like stench.
Uses
Used in the manufacture of plastics, in the synthesis of rubber chemicals, and as a disinfectant and preservative.

Registry Numbers and Inventories.
CAS
123-38-6
EC (EINECS/ELINCS)
204-623-0
EC Index Number
605-018-00-8
EC Class
Highly flammable; Irritant
R 11 36/37/38
S 9 16 29
RTECS
UE0350000
RTECS class
Mutagen; Primary Irritant
UN (DOT)
1275
Merck
12,8008
Beilstein/Gmelin
506010
Beilstein Reference
4-01-00-03165
EPA OPP
202400
Swiss Giftliste 1
G-2789
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H6O
Formula mass
58.08
Melting point, °C
-81
Boiling point, °C
48
Vapor pressure, mmHg
318 (25 C)
Vapor density (air=1)
1.8
Odor Threshold Odor threshold 1 ppm
Critical temperature
223
Critical pressure
4.7
Density
0.811 g/cm3 (20 C)
Solubility in water
Very soluble
Viscosity
0.47 cp (10 C)
Surface tension
23.4 g/s2
Refractive index
1.3695 (20 C)
Dipole moment
2.52 D
Dielectric constant
17.4 (25 C)
Heat of vaporization
29.7 kJ/mol
Heat of combustion
-1819 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area. Refrigerator (approx 4 C). Do not expose to air. Store under an inert atmosphere.
B2 D2B
Handling
Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Handle under an inert atmosphere. Store protected from air. This product may be under pressure; cool before opening. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A full facepiece respirator with organic vapor cartridge may be worn up to 50 times the exposure limit or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest. For emergencies or instances where the exposure levels are not known, use a full-facepiece positive-pressure, air-supplied respirator.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Use a spark-proof tool. Provide ventilation. Place under an inert atmosphere. A vapor suppressing foam may be used to reduce vapors.
Disposal code
7
Stability
Stable under ordinary conditions of use and storage. Reacts with water to form propionic acid. Forms peroxides of unknown stability.
Incompatibilities
Oxidizing agents, strong reducing agents, acids, strong bases, caustics, air, methyl methacrylate.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
-27
Autoignition, °C
207
Upper exp. limit, %
17.0
Lower exp. limit, %
2.9
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Extremely flammable liquid. Water may be ineffective. Material is lighter than water and a fire may be spread by the use of water. Containers may explode in the heat of a fire. Will be easily ignited by heat, sparks or flame. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. Water may be ineffective.
Fire potential
Extremely flammable liquid and vapor.
Hazards
Vapor is heavier than air and may travel considerable distance to a source of ignition and flash back.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
2
 
Flammability
3
 
 
Reactivity
2
 

Health.
Poison_Class
4
Exposure effects
Effects may be delayed. Laboratory experiments have resulted in mutagenic effects.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed.
   Inhalation
Causes respiratory tract irritation. Vapors may cause dizziness or suffocation. Can produce delayed pulmonary edema.
   Skin
Causes mild skin irritation.
   Eyes
Causes severe eye irritation. May cause chemical conjunctivitis.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Remove contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1275
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
PAD
 
HS Code
2912 19 00
 
Std. Transport #
4908270
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
S/P