**Self-polymerization of furan
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Recently, a reaction needs to be carried out using tetrahydrofuran, and there is concern that **furan may undergo polymerization at high temperatures. That person has experience in this area. **Does furan undergo self-polymerization at high temperatures, especially above 200 degrees? Whether gas **furan** or liquid **furan** undergoes polymerization at high temperatures, and how to prevent their self-polymerization.
**Furan possesses the properties of an alkene, and it may undergo self-polymerization at high temperatures, especially above 200 degrees Celsius. Polymerization can occur in either gas or liquid states. Preventing self-polymerization can be achieved by using stabilizers, lowering the reaction temperature, and shortening the reaction time. Specific adjustments need to be made according to the experimental conditions. .
When producing polyester polyols through reactions such as those using 1,4-butanediol and oxalic acid, THF gets mixed into the product, affecting the conversion rate and product purity. In a previous European plant, the process package involved maintaining the reaction temperature at around 225°C and the vacuum level at 20 mbara, while using highly selective stannous octoate as a catalyst. Of course, a collection tank is needed to capture THF after it is evacuated under vacuum, and attention must be paid to the tin content in the product, as the catalyst remains in the product in the end. If it is necessary to remove the catalyst, purification steps such as alkaline washing, water washing, and diatomite filtration must be added in subsequent stages.