Toxicological Profile for 2-Butanone

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2-BUTANONE 64 CHAPTER 4. CHEMICAL AND PHYSICAL INFORMATION 4.1 CHEMICAL IDENTITY Data pertaining to the chemical identity of 2-butanone are listed in Table 4-1. Table 4-1. Chemical Identity of 2-Butanone Characteristic Information Reference Chemical name 2-Butanone CAS 1989 Synonym(s) and registered Methyl ethyl ketone; MEK; ethyl methyl CAS 1989; SANSS 1989; trade name(s) ketone; methyl acetone; and others; Chemline 1989; OHM/TADS Meetco 1989 Chemical formula C4H8O CAS 1989 Chemical structure O 3CH C C CH3 H 2 CAS Registry Number 78-93-3 CAS 1989 CAS = Chemical Abstracts Service 4.2 PHYSICAL AND CHEMICAL PROPERTIES The physical and chemical properties of 2-butanone are presented in Table 4-2. Table 4-2. Physical and Chemical Properties of 2-Butanone Property Information Reference Molecular weight 72.11 Weast et al. 1988 Color Colorless Sax and Lewis 1987 Physical state Liquid Sax and Lewis 1987 Melting point -86.3°C Weast et al. 1988 Boiling point 79.6°C Weast et al. 1988 Density (liquid) at 20°C 0.8054 Weast et al. 1988 Odor Acetone-like Sax and Lewis 1987 Odor threshold: Water 8.4 ppm Amoore and Hautala 1983 Air 5.4 ppm Amoore and Hautala 1983 2-BUTANONE 65 4. CHEMICAL AND PHYSICAL INFORMATION Table 4-2. Physical and Chemical Properties of 2-Butanone Property Information Reference Solubility: Water at 25°C 136,000 mg/L Tewari et al. 1982 Organic solvents Benzene, alcohol, ether, oils, most Sax and Lewis 1987; Neier and organic solvents Strehlke 1985 Partition coefficients: Log Kow 0.29 Hansch et al. 1995 Log Koc 0.55 Roy and Griffin 1985 Vapor pressure at 25°C 90.6 mmHg Riddick et al. 1986 Henry's law constant at 25°C 5.77x10-5 atm m3/mol Rathbun and Tai 1987 Autoignition temperature 515°C Sax and Lewis 1987 Flashpoint: Closed cup -2°C Riddick et al. 1986 Open cup 1°C Riddick et al. 1986 Flammability limits in air 2–10% Sax and Lewis 1987 Conversion factors: ppm (v/v) to mg/m3 in air 1 ppm=2.95 mg/m3 (20°C) mg/m3 to ppm (v/v) in air 1 mg/m3=0.339 ppm (20°C) Bioconcentration factor 0.98 (calculated from Kow) Lyman et al. 1982 Explosive limits 1.4–11.4% at 200°F NIOSH 2019 .

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Methyl Ethyl Ketone (2-Butanone)
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