Preparation of a bleach

Details Preparation of a bleach Preparation of a bleach

C - Chemistry, Metallurgy

07

C

260/509.7

C07C 409/34 (2006.01)

Patent

CA 1081252

ABSTRACT The present invention provides a process for producing diphthaloyl peroxide comprising the steps of reacting particulate phthalic anhydride with aqueous hydrogen peroxide in a mobile slurry or paste and there- after separating diphthaloyl peroxide from the aqueous phase. Preferably the minimum volume of hydrogen peroxide solution is employed commensurate with obtaining a mobile slurry or paste in a mole ratio of phthalic anhydride to hydrogen peroxide of 4:3 to 1:3. Preferably the reaction is effected at a temperature of from 25 to 50°C. Diphthaloyl peroxide is particularly suitable for washing/bleaching fabrics, optionally in conjection with an inorganic persalt e.g. sodium perborate, at a temperature of from 30 to 60°C.

265400

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