Propanediol is unsaturated polyester, epoxy resins, polyurethane resin and important raw materials, this about the amount of about of propylene glycol total consumption of about 45%, this kind of unsaturated polyester is used extensively for surface coatings and reinforced plastic. Propanediol viscous and hygroscopicity good and non-toxic, and therefore in food, medicine and cosmetics industry is widely used as a moisture absorption, 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