Methacrolein Property

Melting point:

-81 °C

Boiling point:

69 °C

Density 

0.85 g/mL at 25 °C(lit.)

vapor density 

2.4 (vs air)

vapor pressure 

121 mm Hg ( 20 °C)

refractive index 

n20/D 1.416(lit.)

Flash point:

5 °F

storage temp. 

2-8°C

solubility 

Benzene (Slightly), Chloroform (Soluble), Methanol (Soluble)

form 

Liquid

color 

Pale yellow

Odor

at 0.01 % in dipropylene glycol. wild hyacinth foliage

Odor Type

floral

Odor Threshold

0.0085ppm

Water Solubility 

6 g/100 mL (20 ºC)

Sensitive 

Light Sensitive

BRN 

1209258

Exposure limits

ACGIH: TWA 1 mg/m3
OSHA: TWA 2 mg/m3
NIOSH: IDLH 50 mg/m3; Ceiling 2 mg/m3

Stability:

Stable. Incompatible with strong bases, strong oxidising agents, strong reducing agents. Light and air-sensitive. Hazardous polymerisation may occur.

InChIKey

STNJBCKSHOAVAJ-UHFFFAOYSA-N

LogP

0.9 at 23℃

CAS DataBase Reference

78-85-3(CAS DataBase Reference)

NIST Chemistry Reference

2-Propenal, 2-methyl-(78-85-3)

EPA Substance Registry System

Methacrolein (78-85-3)

Safety

Hazard Codes 

F,T

Risk Statements 

11-24/25-34-26

Safety Statements 

16-26-36/37/39-45-28A

RIDADR 

UN 2396 3/PG 2

WGK Germany 

3

RTECS 

OZ2625000

F 

8-23

TSCA 

Yes

HazardClass 

3

PackingGroup 

II

HS Code 

29121900

Hazardous Substances Data

78-85-3(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H225Highly Flammable liquid and vapour

H314Causes severe skin burns and eye damage

H330Fatal if inhaled

H341Suspected of causing genetic defects

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Methacrolein Chemical Properties,Usage,Production

Chemical Properties

colourless to light yellow liquid

Uses

An unsaturated aldehyde used in the manufacture of polymers and synthetic resin. Cancer studies revealed consumption and release of this volatile organic compound in human small cell lung cancer line, a potential cancer biomarker.

Uses

Methacrolein was used to study the effect of parts per billion levels of limonene oxidation products and the terpene oxidation product, methacrolein on human eye blink frequency. It was also used in determination of rate constants and the products of the reactions between atomic chlorine and acrolein, methacrolein and methyl vinyl ketone.

Uses

Methacrolein is used in the manufacturing of polymers, synthetic resins and plastics. It acts as a raw material of methylmalonic acid, thermoplastic fuel and in the preparation of 2,3-dibromo-2-methyl-propionaldehyde. It is also used to study the effect limonene oxidation products and the terpene oxidation product.

Definition

ChEBI: Methacrolein is an enal.

General Description

A colorless liquid. Flash point 35°F. Less dense than water. May be toxic by ingestion, inhalation and skin absorption. Severely irritating to skin and eyes. Used to make plastics.

Air & Water Reactions

Highly flammable. Soluble in water.

Reactivity Profile

Methacrolein is an aldehyde. Aldehydes are frequently involved in self-condensation or polymerization reactions. These reactions are exothermic; they are often catalyzed by acid. Aldehydes are readily oxidized to give carboxylic acids. Flammable and/or toxic gases are generated by the combination of aldehydes with azo, diazo compounds, dithiocarbamates, nitrides, and strong reducing agents. Aldehydes can react with air to give first peroxo acids, and ultimately carboxylic acids. These autoxidation reactions are activated by light, catalyzed by salts of transition metals, and are autocatalytic (catalyzed by the products of the reaction). The addition of stabilizers (antioxidants) to shipments of aldehydes retards autoxidation.

Hazard

Flammable, dangerous fire risk. Strong irritant.

Health Hazard

TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Inhalation or contact with some of these materials will irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

Fire Hazard

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion and poison hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Flammability and Explosibility

Highly flammable

Safety Profile

Poison by ingestion and sktn contact. Moderately toxic by inhalation. Severe eye and skin irritant. Mutation data reported. Dangerously flammable liquid when exposed to heat, flame, or oxidizers. Can react vigorously with oxidizing materials. To fight fire, use CO2, alcohol foam, foam, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes. See also ALDEHYDES.

Purification Methods

Fractionally distil it under nitrogen through a short Vigreux column (p 11). Store it in sealed ampoules. (Slight polymerisation may occur.) [Beilstein 1 IV 3455.]