How to recover olefin epoxidation – quaternary ammonium peroxotungstophosphate catalysts

The recovery of the quaternary ammonium peroxotungstophosphate catalyst used in olefin epoxidation can be achieved through the following methods: 1. Solvent extraction: An appropriate solvent is added to the reaction mixture, and the catalyst is extracted using this solvent. A solvent with high affinity for the catalyst can be selected to separate the catalyst from the reaction solution. 2. Washing method: The reaction mixture is stirred with an appropriate washing agent. Through the interaction between the washing agent and the catalyst, the catalyst is transferred from the reaction solution into the washing agent, thereby achieving the purpose of catalyst recovery. 3. Distillation method: Utilizing the difference in boiling points between the catalyst and the reactants or products, the catalyst is separated from the reaction mixture through distillation. It is important to note the temperature stability and vaporization temperature of the catalyst. 4. Solid separation method: The reaction mixture is subjected to solid separation operations such as filtration and centrifugation to separate the catalyst from the reaction mixture. This method is applicable when the catalyst exists in solid form. 5. Regeneration method: Regenerate the catalyst to restore its activity. Impurities in the reaction waste liquid can be removed through methods such as washing, pyrolysis, and dissolution, allowing the catalyst to be reused. The above are some common methods for recycling catalysts; the specific method to be chosen should be determined through evaluation based on actual circumstances. .

Thanks, but these methods don’t seem to be very applicable to this type of catalyst