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Chemical Fact Sheet

Chemical Abstract Number (CAS #) 126987
CASRN 126-98-7
SynonymsMethacrylonitrile
2-Propenenitrile, 2-methyl-
Analytical Methods EPA Method 524.2
EPA Method 8260
Molecular FormulaC4H5N

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use IN PREPN OF HOMOPOLYMERS & COPOLYMERS; AS AN INTERMEDIATE IN PREPN OF ACIDS, AMIDES, AMINES, ESTERS, NITRILES Vinyl nitrile monomer, copolymer with styrene, butadiene, etc, elastomers, coatings, plastics MONOMER FOR POLYMETHACRYLONITRILE
Apparent Color COLORLESS LIQUID
Odor ODOR SIMILAR TO BITTER ALMOND
Boiling Point 90.3 DEG C @ 760 MM HG
Melting Point -35.8 DEG C
Molecular Weight 67.10
Density 0.8001 @ 20 DEG C/4 DEG C
Odor Threshold Concentration IT SHOULD BE NOTED THAT METHACRYLONITRILE CANNOT BE DETECTED BY ITS SMELL EVEN AT CONCENTRATIONS WHICH ARE ALREADY DANGEROUS FOR HUMANS.
Sensitivity Data LACRIMATOR A skin, eye irritant.
Environmental Impact Methylacrylonitrile can be released to the environment in gaseous and wastewater effluents at sites of its commercial production. If released to the atmosphere, it will degrade primarily by reaction with photochemically produced hydroxyl radicals (estimated half-life of 2 days). If released to water, methylacrylonitrile can be physically removed via volatilization. The estimated volatilization half-lives from a model river (one meter deep) and model environmental pond are 5.3 and 60 hr, respectively. If released to soil, methylacrylonitrile may leach readily based upon an estimated Koc value of 18.3. It has a relatively high vapor pressure (71.2 mm Hg at 25 deg C) which indicates that evaporation from terrestrial surfaces is likely to occur. Insufficient data are available to predict the importance of microbial degradation in soil or water. Occupational exposure to methylacrylonitrile can occur through inhalation, dermal exposure, or ingestion. Inhalation is expected to be the major route of occupational exposure.
Environmental Fate TERRESTRIAL FATE: Very little is known about the fate of methylacrylonitrile in soil. An estimated Koc value of 18.3 suggests that methylacrylonitrile will be very mobile in soil and subject to significant leaching(1,SRC). It has a relatively high vapor pressure of 71.2 mm Hg at 25 deg C which indicates that evaporation from terrestrial surfaces is likely to occur. Insufficient data are available to predict the importance of abiotic or microbial degradation in soil. Linetskii VA, Serebryakov BR; Izv Vysshikhuchebn Zavedenii, Neft I Gaz 8: 62 (1965)] AQUATIC FATE: Volatilization of methylacrylonitrile is expected to be an important fate process in water. The estimated volatilization half-lives from a model river (one meter deep) and model environmental pond are 5.3 and 60 hr, respectively(1,2,SRC). Limited experimental aqueous hydrolysis data suggest that environmental hydrolysis will be slow(3,SRC). Aquatic bioconcentration and adsorption to sediment are not expected to be important. Insufficient data are available to predict the importance of microbial degradation in water. ATMOSPHERIC FATE: Based upon a vapor pressure of 71.2 mm Hg at 25 deg C , methylacrylonitrile is expected to exist almost entirely in the vapor-phase in the ambient atmosphere(2,SRC). It is degraded in an average ambient atmosphere by reaction with photochemically produced hydroxyl radicals at an estimated half-life of about 2 days(3,SRC). The estimated half-life for the reaction with atmospheric ozone is about 32 days(4,SRC). Physical removal via wet deposition is possible.
Drinking Water Impact SURFACE WATERS: Methylacrylonitrile was qualitatively detected in only 1 surface water sample collected from 204 sites near heavily industrialized areas across the US . EFFL: Trace amounts of methylacrylonitrile (concn or detection limit not reported) were detected in an aqueous process effluent from a coal gasification facility in Gillette, WY .

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