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US 5,397,475 AGranted
Purification of hydrogen peroxide
AssigneeInterox Chemicals Limited
InventorsMalcolm H. Millar, Francis R. F. Hardy, Gareth W. Morris, John R. Crampton
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AssigneeInterox Chemicals Limited
InventorsMalcolm H. Millar, Francis R. F. Hardy, Gareth W. Morris, John R. Crampton
Estimating the term…
Purification of aqueous hydrogen peroxide solutions using conventional ion-exchange techniques can result in the hydrogen peroxide decomposing explosively. Much safer processes are obtained by restricting the contact between the resin bed and the hydrogen peroxide solution to a very short contact time, by employing a treatment chamber that is vented to the atmosphere and also by slurrying the resin bed. The bed is conveniently retained on a mesh that acts as a filter (13) preferably conical having an aperture (17) at its apex through which is introduced a small fraction of the solution countercurrent (10) to the main solution flow (9) in order to slurry the bed (19). The solution can be recycled through the same bed or a plurality of beds. Very high purification can be achieved and combined with improved safety of operation.
In a process for purifying an aqueous metal ion-containing hydrogen peroxide solution which comprises contacting said solution with an ion exchange resin in acid form until at least a fraction of the metal ions have been exchanged for hydrogen ions, and thereafter separating the ion exchange resin and solution, the improvement wherein the resin is employed in the form of a shallow slurried bed of ion exchange particles and wherein said contacting is effected by passing said solution through said bed at a rate of at least 200 bed volumes per hour.
Apparatus for purifying an aqueous metal ion-containing hydrogen peroxide solution comprising:
Dependencies are inferred from the claim text.