Molecular formula : C3H8O2
MW : No. 57-1 76.10
nature : thick colorless liquid absorbent stable, almost tasteless odorless, flammable. -60 ° C melting point. Boiling point of 187.3 ° C and relative density of 1.036 (25 / 4 ° C), the refractive index of 1.4326, surface tension (20 ° C) 38mN / m, viscosity (20 ° C) 60.5mPa s, heat capacity (20 ° C) 2.49kJ / (kg ° C), thermal vaporization (101.3 kPa) 711kJ/kg, burning hot (25 ° C) 1824.0kJ/mol, flash point (open cup) 99 ° C, 415.5 ° C spontaneous combustion point, critical temperature of 352 ° C, critical pressure 6.1MPa. with water, ethanol and multiple immiscible organic solvent. 150 ° Ceasily oxidized.
Preparation : 1. Propylene oxide directly pressurized water legitimate non-catalyzed hydrolysis. By propylene oxide and water in 150-160 ° C ,0.78 - 0.98 MPa pressure, the hydration system in direct response product by evaporation, distillation, in finished products. 2. Propylene oxide legitimate indirect water from propylene oxide and sulfate water for hydration catalyst obtained indirectly. 3. Propylene direct catalytic oxidation.
purposes : propanediol is unsaturated polyester, epoxy resins, polyurethane resins and important raw materials, which account for about the amount of propylene glycol total consumption of about 45%, unsaturated polyester is used extensively for surface coatings and reinforced plastics. Propanediol viscous and hygroscopicity good and non-toxic, and therefore food, medicine and cosmetics industry for the extensive use of moisture, antifreeze, lubricants and solvents. In the food industry, propylene glycol and propylene glycol fatty acid formation of fatty acid esters, mainly for food emulsifier; Propanediol condiments and pigment is an excellent solvent. Propanediol in the pharmaceutical industry commonly used for the manufacture of various types of ointment, gel solvent, softener and excipient such as propylene glycol and various spices have good solubility, which is also used as a solvent and cosmetics, etc. softener. Propylene glycol is also used for tobacco humidification agent, Fungicide, food processing equipment lubricants and food labeling ink solvents. Propanediol solution is effective antifreeze agent.
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