107-02-8

Molecular structure of Acrolein (CAS NO.107-02-8) is:

Product Name: Acrolein
CAS Registry Number: 107-02-8
IUPAC Name: prop-2-enal
Molecular Weight: 56.06326 [g/mol]
Molecular Formula: C₃H₄O 
EINECS: 203-453-4
Melting Point: -87 °C(lit.)
Surface Tension: 20.1 dyne/cm
Density: 0.795 g/cm³
Flash Point: -2 °F
Enthalpy of Vaporization: 29.6 kJ/mol
Boiling Point: 52.8 °C at 760 mmHg
Vapour Pressure: 261 mmHg at 25°C
Refractive index: n20/D 1.403(lit.)
Storage temp.: 2-8°C
Water Solubility: Soluble. 21.25 g/100 mL
Stability: Stable, but very readily polymerizes.  
Product Categories: Pharmaceutical Intermediates;Miscellaneous;Biocide

 Acrolein (CAS NO.107-02-8) is used in the preparation of Propylene Glycol, polyester resin, polyurethane, acrylic acid, acrylonitrile, and Glycerol. It tends to polymerize when left at room temperature, leaving a gummy yellowish residue with a putrid odor. It is also thought to be an intermediate in the Skraup synthesis of quinolines, but is rarely used because of its instability.It is also used as a contact herbicide to control submersed and floating weeds, as well as algae, in irrigation canals.It is sometimes used as a fixative in preparation of biological specimens for electron microscopy.It was used as a chemical weapon during World War I,because of it's severe pulmonary irritant and lachrymatory agent.

The first commercial process for manufacturing Acrolein was based on the vaporphase condensation of acetaldehyde and formaldehyde.
      HCH=O+CH₃CH=O → CH₂=CHCHO+H₂O
Catalyst developments led to a vapor-phase processes for the production of Acrolein in which propylene was the starting material.
       CH₃CH=CH₂ + [O] → CH₂=CHCHO + H₂O
The catalytic vapor-phase oxidation of propylene is generally carried out in a fixed-bed multitube reactor at near atmospheric pressures and elevated temperatures (ca 350 °C); molten salt is used for temperature control. Air is commonly used as the oxygen source and steam is added to suppress the formation of flammable gas mixtures. Operation can be single pass or a recycle stream may be employed.
The reactor effluent gases are cooled to condense and separate the acrolein from unreacted propylene, oxygen, and other low-boiling compo-nents (predominantly nitrogen). This is commonly accomplished in two absorption steps where aqueous acrylic acid (CH₂=CHCO₂H) is con-densed from the reaction effluent and absorbed in a water-based stream and Acrolein is condensed and absorbed in water to separate it from the propylene, nitrogen, oxygen, and carbon oxides. Acrylic acid may be recovered from the aqueous product stream if desired. Subsequent distillation refining steps separate water and acetaldehyde (CH₃CHO) from the crude acrolein. In another distillation column, refined acrolein is recovered as an azeotrope with water. The principal side reactions produce acrylic acid, acetaldehyde, acetic acid, carbon monoxide, and carbon dioxide, and a variety of other aldehydes and acids are also formed in small amounts.

 Acrolein (CAS NO.107-02-8) is a severe pulmonary irritant and lachrymatory agent. Skin exposure to acrolein causes serious damage. Acrolein concentrations of 2 ppm are immediately harmful. It is not a suspected human carcinogen; no studies proved carcinogenic effects of acrolein on humans, but studies on rats have shown an increase in cancerous tumors from ingestion, but not from inhalation.  In October 2006, researchers found connections between Acrolein in the smoke from TOBACCO cigarettes and the risk of lung cancer. Furthermore, it is a toxic metabolite of Cyclophosphamide, a cytotoxic chemotherapy agent, and results in hemorrhagic cystitis .
Hazard Codes: F; T+,T;  N
Risk Statements: 11-24/25-26-34-50
11:  Highly Flammable 
24/25:  Toxic in contact with skin and if swallowed 
26:  Very Toxic by inhalation 
34:  Causes burns 
50:  Very Toxic to aquatic organisms
Safety Statements:  23-26-28-36/37/39-45-61
23:  Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) 
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
36/37/39:  Wear suitable protective clothing, gloves and eye/face protection
45:  In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) 
61:  Avoid release to the environment. Refer to special instructions safety data sheet
RIDADR UN 1092 6.1/PG 1
WGK Germany: 3
RTECS: AS1050000
F: 8-9
HazardClass: 6.1
PackingGroup: I

 Acrolein , its cas register number is 107-02-8. It also can be called 2-Propen-1-one ; 2-Propenal ; Acrylaldehyde ; Acrylic aldehyde ; Acraldehyde ; Propenaldehyde .It is a colourless to slightly yellow liquid.It is highly flammable. It reacts slowly and exothermically with water to give 3-hydroxypropionaldehyde. At room temperature, Acrolein (CAS NO.107-02-8) is a liquid with volatility and flammability somewhat similar to those of acetone, but, unlike acetone, its solubility in water is limited. Commercially, it is always stored with hydroquinone and acetic acid as inhibitors.