1. Direct hydration of propylene oxide is a pressurized non-catalytic hydrolysis method. It is prepared by direct hydration of propylene oxide and water at 150-160°C and 0.78-0.98MPa pressure, and the reaction product is evaporated and rectified to obtain the finished product.
2. Indirect hydration of propylene oxide It is prepared by indirect hydration of propylene oxide and water with sulfuric acid as a catalyst.
3. Direct catalytic oxidation of propylene.
4. Using 1,2-dichloropropane as raw material: