双乙烯酮 Acetyl ketene

物理描述 Physical Description

Diketene, stabilized appears as a colorless liquid with a disagreeable odor. Slightly less dense than water. Irritates skin and eyes. Used to make paints and pharmaceuticals.

颜色/状态 Color Form

Colorless liquid; turns brownish-yellow upon standing at room temperature

气味 Odor

Pungent odor

沸点 Boiling Point

126.1 °C

熔点 Melting Point

-6.5 °C

闪点 Flash Point

33 °C c.c.

溶解度 Solubility

Slightly soluble in aliphatic hydrocarbons such as hexane (ca. 12.5 wt% at 23 °C), octane, cyclohexane, and methyl cyclohexane

密度 Density

1.0877 g/cu cm at 20 °C

蒸气密度 Vapor Density

2.9 (Air = 1)

蒸汽压力 Vapor Pressure

10.7 mm Hg at 25 °C

稳定性/保质期 Stability Shelf Life

Self-initiated exotermic dimerization is explosive.

自燃温度 Autoignition Temperature

590 °F (310 °C)

分解 Decomposition

Begins to react and decompose exothermically at 208 °F (98 °C) or lower if contaminated.

粘度 Viscosity

0.88 mPa.s

汽化热 Heat Of Vaporization

42.89 kJ/mol at 25 °C

表面张力 Surface Tension

33.89 mN/m at 25 °C

折光率 Refractive Index

Index of refraction: 1.4342 at 23 °C/D

保留指数 Kovats Retention Index

709.2

其他实验性质 Other Experimental Properties

Specific gravity: 1.09471 at 20 °C/4 °C; 1.088754 at 25 °C/4 °C

聚合 Polymerization

Presence of mineral or lewis acids, or bases including amines, will catalyse violent polymerisation of this very reactive dimer, accompanied by gas evolution. Sodium acetate is sufficiently basic to cause violent polymerization at 0.1% concn when added to diketene at 60 °C.

辛醇/水分配系数 LogP

log Kow = -0.39 (est)