Propylene glycol is an organic compound (diol), usually slightly A sweet, odorless, colorless and transparent oily liquid that absorbs moisture and is easily mixed with water, acetone, and chloroform. Propylene glycol, which is widely used in various industries, is divided into two types: 1,2-propanediol and 1,3-propanediol. The propylene glycol commonly referred to in the market is 1,2-propanediol.
The following suppliers of propylene glycol will give you a detailed introduction to the production methods of the two:
1.1,2-PDO production method:
(1) Propylene oxide hydration method (there are two types below)
1) Propylene oxide direct hydration method: propylene oxide reacts with water at 200℃ and 120MPa. The reaction product is evaporated and distilled to obtain 10% of the finished propylene glycol product, dipropylene glycol and high polyol.
2) Propylene oxide indirect hydration method: produced by indirect hydration of propylene oxide and water using sulfuric acid as a catalyst. The hydration reaction formula of propylene oxide is as follows:
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