Operating conditions for active alumina in hydrogen peroxide production
· Contact time: The longer the contact time between the working solution or hydrogenated solution and the active alumina, the better the regeneration effect. If the contact time is less than 0.5 hours, the regeneration effect is not obvious; a contact time of more than 1.5 hours is the best. In practical production, the contact time between the working solution and the active alumina is generally short. By increasing the amount of active alumina added or allowing part of the working solution to pass through the active alumina bed, the contact time can be increased.
· Contact temperature: The regeneration effect of the working solution in the active alumina is related to the temperature. When the temperature increases, the effective anthraquinone content after regeneration increases significantly. In production, the post-treatment working solution can be preheated and passed through the bentonite bed, then cooled before going to the hydrogenation process to improve the regeneration capacity.
· Working solution composition: The moisture, alkali solution or H₂O₂ content of the working solution entering the active alumina bed should be controlled properly. If it exceeds the limit, the regeneration capacity of the alumina will decrease, and even the alumina will powderize. However, maintaining an appropriate alkalinity of the active alumina is beneficial. There is a patent report stating that the Na₂O content in the alumina is up to 3.7%, which is beneficial to the degradation of the regenerated substances.
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