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Propylene glycol, scientific name 1, 2-propylene glycol, is a common organic compound with sweet taste and certain toxicity, divided into industrial grade and pharmaceutical grade. The industrial grade is mainly used for unsaturated polyester resins and kinetic energy fluids, and the pharmaceutical grade is mainly used for medicine and cosmetics. It has many uses in medicine, cosmetics, food and industrial production. The synthesis methods include propylene oxidation method and propylene oxide aqueous method. With the development of science and technology, the application prospect of 1, 2-propylene glycol is broad. In the field of medicine, 1, 2-propylene glycol is used as a solvent and carrier of drugs to help drugs dissolve and deliver better. It is also commonly used as a preservative and moisturizer in pharmaceuticals to extend the shelf life of pharmaceuticals and increase the comfort of pharmaceuticals.