Continuous preparation of alkaline hydrogen peroxide solution by micromixing device: Experiment and theoretical analysis

In the context of achieving continuous synthesis of acyl peroxides using microreactors, continuous preparation of alkaline hydrogen peroxide (AHP) solution is required. However, two key issues, Na₂O₂ precipitation and H₂O₂ decomposition, need to be considered or addressed. For the precipitation of Na₂O₂ during NaOH and H₂O₂ mixing, experiments revealed that precipitation could be avoided by appropriate selection of operation window. For the risk of violent H₂O₂ decomposition when NaOH and H₂O₂ solutions are one-step mixed, theoretical approaches were adopted. Simulation-derived mixing time is combined with decomposition kinetics to find a direct relationship between operation-structure parameters and percentage of decomposed H₂O₂. This percentage is estimated to be in the order of 10⁻⁴ for micromixing devices, which indicates that micromixing devices can be used to one-step mix NaOH and H₂O₂ solution without causing violent H₂O₂ decomposition. This work provides insights into the preparation of AHP solution and facilitates its continuous preparation.