1,4-二氧六环 1,4-Dioxane

物理描述 Physical Description

Dioxane appears as a clear colorless liquid with a faint ethereal odor. Flash point 55°F. Slightly denser than water and soluble in water. Vapors heavier than air. Susceptible to autooxidation to form peroxides.

颜色/状态 Color Form

Colorless liquid or solid (below 53 degrees F)

气味 Odor

Faint pleasant odor

沸点 Boiling Point

101.5 °C

熔点 Melting Point

11.8 °C

闪点 Flash Point

12 °C c.c.

溶解度 Solubility

In water, >800 g/L at 25 °C

密度 Density

1.0337 g/cu cm at 20 °C

蒸气密度 Vapor Density

3.03 (NTP, 1992) (Relative to Air)

蒸汽压力 Vapor Pressure

38.1 mm Hg at 25 °C

亨利常数 Henrys Law Constant

4.80e-06 atm-m3/mole

稳定性/保质期 Stability Shelf Life

Stable under recommended storage conditions. Test for peroxide formation before distillation or evaporation. Test for peroxide formation or discard after 1 year. Stable under recommended storage conditions.

自燃温度 Autoignition Temperature

Autoignition temperature, 356 °F, (180 °C)

分解 Decomposition

When heated to decomposition it emits acrid smoke and irritating fumes.

粘度 Viscosity

0.0120 centipoise at 25 °C

燃烧热 Heat Of Combustion

581 kcal/mol

汽化热 Heat Of Vaporization

34.15 kJ/mol at 101.5 °C; 38.60 kJ/mol at 25 °C

表面张力 Surface Tension

32.75 mN/m at 25 °C; 29.28 mN/m at 50 °C

电离电位 Ionization Potential

9.13 eV

气味阈值 Odor Threshold

...Air threshold of recognition at 170 ppm. This odor recognition threshold allows for dioxane to be detected before acute toxic effects occur.

折光率 Refractive Index

Index of refraction: 1.4224 20 °C

相对蒸发率 Relative Evaporation Rate

2.7 (Butyl acetate = 1)

保留指数 Kovats Retention Index

690;690;731.3;718;705;721;697;696;696;698;690;692;694;690;693;696;699;696;696;697;686;680;687.3;690;702;690;696;686;692;687

其他实验性质 Other Experimental Properties

Cryoscopic constant: 4.83; heat of fusion: 2.98 kcal/mol; specific heat: 0.0370 kcal/mol/deg C at 20 °C; azeotropic mixture with water: 81.6% dioxane, bp 87.8 °C; azeotropic mixture with ethanol: 9.3% dioxane, bp 78.1 °C

辛醇/水分配系数 LogP

-0.27 (LogP)

辛醇/空气分配系数 Logkoa

3.18 (Octanol-Air partition coefficient)

大气OH速率常数 Atmospheric Oh Rate Constant

1.09e-11 cm3/molecule*sec