Chemistry of inorganic compounds – Oxygen or compound thereof – Peroxide
Patent
1995-06-23
1996-07-09
Langel, Wayne
Chemistry of inorganic compounds
Oxygen or compound thereof
Peroxide
C01B 1501
Patent
active
055342388
ABSTRACT:
An efficient method is proposed for the preparation of a highly purified aqueous hydrogen peroxide solution, which can be used even in a semiconductor process, from a crude aqueous solution containing metallic and inorganic impurities. The method comprises the steps of: (a) acidifying the crude solution by the addition of a specific amount of an acid such as sulfuric and nitric acids; and (b) passing the acidified crude solution through a column filled with a strongly acidic cation-exchange resin in the hydrogen-form or a mixture of the same with a strongly basic anion-exchange resin in the hydroxy-, carbonate- or hydrogencarbonate-form in a specified volume proportion so that the impurities are removed by ion-exchange. The efficiency of this purification treatment can be further enhanced by keeping the acidified crude solution for a certain length of time of, for example, at least 6 hours prior to the ion-exchange treatment in step (b).
REFERENCES:
patent: 3294488 (1966-12-01), Dunlop et al.
patent: 4999179 (1991-03-01), Sugihara et al.
patent: 5200166 (1993-04-01), Shiga et al.
patent: 5397475 (1995-03-01), Millar et al.
Kajiwara Shoichiro
Serizawa Hirokazu
Langel Wayne
Mitsubishi Gas Chemical Company Inc.
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