Stabilisation of hydrogen peroxide solutions

Details Stabilisation of hydrogen peroxide solutions Stabilisation of hydrogen peroxide solutions

C - Chemistry, Metallurgy

01

B

C01B 15/037 (2006.01) C11D 3/39 (2006.01)

Patent

CA 2047239

ABSTRACT OF THE DISCLOSURE Dilute aqueous alkaline hydrogen peroxide solutions obtained by dilution of and addition of alkali to a concentrated acidic hydrogen peroxide solution and addition of an aminopolyalkylene phosphonic acid compound as stabiliser can enjoy improved stability by introducing a delay between the addition of the stabiliser and the formation of the dilute alkaline solution sufficient to permit the stabiliser to be transformed to a more active derivative. Preferably, the stabiliser introduced is cyclohexane-1,2-diaminotetrakis (methylene phosphonic acid), and the dilute solution has a pH of from 8.5 to 9.5, and contains sodium pyrophosphate and/or bicarbonate as buffer, at least part of which may be added to the concentrated hydrogen peroxide solution before dilution.

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