异氰酸甲酯 methyl isocyanate

物理描述 Physical Description

Methyl isocyanate appears as a colorless low-boiling liquid (b.p. 39°C) that is denser than water. Flash point is less than 20° F. Very toxic by inhalation. Can be absorbed through the skin. Has a sharp odor, but the sense of smell cannot be relied upon to warn of the presence of vapors at low concentrations. Rate of onset: Immediate Persistence: Minutes to hours Odor threshold: 2.1 ppm Source/use/other hazard: Intermediate in manufacturing; reacts with H20 (don't use in fire).

颜色/状态 Color Form

Colorless liquid

气味 Odor

Sharp, unpleasant odor

沸点 Boiling Point

39.5 °C

熔点 Melting Point

-45.0 °C

闪点 Flash Point

19 °F (-7 °C) (Closed cup)

溶解度 Solubility

In water, 2.9X10+4 mg/L at 25 °C (est)

密度 Density

0.9230 g/cu cm at 27 °C

蒸气密度 Vapor Density

About twice as heavy as air (EPA, 1998) (Relative to Air)

蒸汽压力 Vapor Pressure

348 mm Hg at 20 °C

自燃温度 Autoignition Temperature

994 °F (534 °C)

分解 Decomposition

The substance decomposes on contact with water. The substance decomposes rapidly on contact with acids and bases producing toxic gases (hydrogen cyanide, nitrogen oxides, carbon monoxide).

腐蚀性 Corrosivity

Methyl isocyanate diffuses through polyethylene and attacks most elastomers (fluorocarbon resins are resistant). It is dangerous to use materials other than stainless steel, nickel, or glass/ceramic in contact with methyl isocyanate. In particular, do not use iron, steel, zinc, tin, copper, or their alloys.

燃烧热 Heat Of Combustion

269.4 KCAL/G MOL WT (LIQ)

电离电位 Ionization Potential

10.67 eV

气味阈值 Odor Threshold

The odor warning when the exposure limit value is exceeded is insufficient.

折光率 Refractive Index

Index of refraction = 1.3419 at 18 °C

保留指数 Kovats Retention Index

502

其他实验性质 Other Experimental Properties

Henry's Law constant = 9.3X10-4 atm-cu m/mol at 25 °C (est)

聚合 Polymerization

The substance will polymerize when pure. The substance may polymerize due to heating and under the influence of metals and catalysts.

辛醇/水分配系数 LogP

log Kow = 0.79 (est)