Dibutyl phthalate

CAS 84-74-2

EINECS 201-557-4

Chemical formula C16H22O4

Molecular weight 278.34

Density 1.043 g/mL at 25 °C (lit.)

Melting point -35 °C (lit.)

Boiling point 340 °C (lit.)

Flash point 340°F

Slightly soluble. 0.0013 g/100 mL

Steam pressure 1 mm Hg (147 °C)

Vapor density 9.6 (vs air)

Solubility Soluble in ethanol, ethyl ether, acetone, benzene

Refractive index n20/D 1.492(lit.)

Storage conditions 2-8°C

Property

Colorless transparent oily liquid, slightly aromatic, flammable. The relative density is 1.045. Freezing point -35 ℃. Boiling point 335℃. Ignition point 202℃. Flash point 171℃. Refractive index 1.4926. Vapor pressure (150℃) 146.6Pa. Heat of vaporization 284.7J /g. Specific heat capacity 1.79J/(g-℃). Viscosity (25℃) 16.3mPa.s. Soluble in common organic solvents and hydrocarbons. At 25℃, 0.03% is dissolved in water, and 0.4% is dissolved in water.

Preparation

The esterification reaction was carried out under atmospheric pressure with phthalic anhydride and n-butanol as raw materials and sulfuric acid as catalyst. After the reaction is completed, it is neutralized with lye and washed with water, and then the finished product is obtained by dealcoholization and press filtration.

Use

This product is plasticizer, non-toxic. Mainly used as polyvinyl chloride plasticizer, can make products have good softness. Because of its relatively low price and good processing, it is widely used in China, almost equivalent to DOP. However, its volatility and water extraction are large, so the durability of the product is poor, and its use should be gradually limited. This product is an excellent plasticizer of nitrocellulose with strong gelation ability. Used in nitrocellulose coatings, it has excellent softening effect, stability and adhesion. This product can also be used as polyvinyl acetate, alkyd resin, ethyl cellulose, natural and synthetic rubber, as well as plexiglass and plasticizer.