nature
Colorless, stable liquid. Combustible. Has a moderately pleasant odor. It's slightly sticky. The relative density is 0.9898. Boiling point 202.7 ° C (195 ° C). Vapor pressure (20ºC)<130Pa. Melting point -78ºC (vitreous) (-25ºC). Viscosity (20ºC) 4.5mPa.s. Refractive index 1.4273 (1.4300). Molar heat of vaporization 47. lOkj/mol. Flash point (open cup) 96.1ºC. Miscible with water, acetone, benzene, chloroform, ethanol, ether, pyridine, etc.
preparation
In the ethylene oxide process, anhydrous ethanol and boron trifluoride monoethyl ether solution were first added to the reactor, and then ethylene oxide was added. When the reaction temperature rises to 45 ° C, cool it and control the reaction temperature below 70 ° C. After the reaction is completed, the fraction below 90ºC(0.lMPa) is collected by neutralization and vacuum distillation to obtain the finished product.
- The most common preparation method is the esterification of ethylene glycol with ethoxyethanol. The reaction is generally carried out under acidic conditions, using an acid catalyst such as sulfuric acid or phosphoric acid.
- Diethylene glycol monoethyl ether can be obtained by adding ethoxycarbinol to diethylene glycol and heating under alkaline conditions.
The diethylene glycol process is prepared by the reaction of diethylene glycol and diethyl sulfate.
use
It can be used as solvent of cellulose, resin, gum, paint, spray paint, etc., printing ink solvent, mutual solvent of mineral oil-soap and mineral oil-sulfide oil mixture, non-paint coloring agent, fiber printing agent, varnish and paint thinner.
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