马来酸酐 Maleic anhydride

物理描述 Physical Description

Maleic anhydride appears as colorless crystalline needles, flakes, pellets, rods, briquettes, lumps or a fused mass. Melts at 113°F. Shipped both as a solid and in the molten state. Vapors, fumes and dusts strong irritate the eyes, skin and mucous membranes. Flash point 218°F. Autoignition temperature 890°F. Used to make paints and plastics and other chemicals.

颜色/状态 Color/Form

Orthorhombic needles from chloroform; commercial grades furnished in fused form, as briquettes

气味 Odor

Pungent odor

沸点 Boiling Point

202.0 °C

熔点 Melting Point

52.8 °C

闪点 Flash Point

102 °C (closed cup)

溶解度 Solubility

In water, 3700 mg/L at 25 °C (est)

密度 Density

0.934 at 20 °C/4 °C

蒸气密度 Vapor Density

3.38 (Air = 1)

蒸汽压力 Vapor Pressure

2.5X10-1 mm Hg at 25 °C

亨利常数 Henry'S Law Constant

Henry's Law constant = 3.9X10-6 atm-cu m/mol at 25 °C (est)

稳定性/保质期 Stability/Shelf Life

Stable under normal laboratory storage conditions.

自燃温度 Autoignition Temperature

477 °C

分解 Decomposition

Maleic anhydride decomposes exothermically, evolving carbon dioxide in the presence of dimethylamine, triethylamine, pyridine, or quinoline at temperatures above 150 °C.

粘度 Viscosity

Viscosity in mPa.s (cP): 0.61 at 60 °C; 1.07 at 90 °C; 0.6 at 150 °C

腐蚀性 Corrosivity

Corrosive material.

燃烧热 Heat Of Combustion

-1389.5 kJ/mol

汽化热 Heat Of Vaporization

54.8 kJ/mol

电离电位 Ionization Potential

9.90 eV

气味阈值 Odor Threshold

Odor Threshold Low: 0.25 [mmHg]; Odor Threshold High: 0.32 [mmHg]; Odor threshold from AIHA

保留指数 Kovats Retention Index

791 ;807 ;790

其他实验性质 Other Experimental Properties

Hydroxyl radical reaction rate constant = 1.45X10-12 cu cm/molecule-sec at 23 °C

辛醇/水分配系数 LogP

log Kow = 1.62

大气OH速率常数 Atmospheric Oh Rate Constant

1.45e-12 cm3/molecule*sec

氢离子浓度指数 pH

pH of water solutions: 2.42 at 1X10-2 M; 2.62 at 5X10-3 M; 3.10 at 1X10-4 M

化学类 Chemical Classes

Plastics & Rubber -> Acid Anhydrides, Cyclic