Propylene glycol scientific name "1,2-propanediol". Chemical formula CH3CHOHCH2OH. Molecular weight 76.10. There is one chiral carbon atom in the molecule. The racemate is a hygroscopic viscous liquid with a slightly spicy taste. Specific gravity 1.036 (25/4°C), freezing point -59°C. Boiling point 188.2 ℃, 83.2 ℃ (1,333 Pa), miscible in water, acetone, ethyl acetate and chloroform, soluble in ether. Soluble in many essential oils, but immiscible with petroleum ether, paraffin and grease. It is more stable to heat and light, and more stable at low temperature. The boiling point of the levorotatory body is 187～189℃, and the specific optical rotation [α]D20-15.0°. Propylene glycol can be oxidized to propionaldehyde, lactic acid, pyruvic acid and acetic acid at high temperature.

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