Preparation of a peroxide

Details Preparation of a peroxide Preparation of a peroxide

1976-05-06

1978-04-11

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C17914

Patent

active

040838773

ABSTRACT:
The present invention provides a process for making diphthaloyl peroxide by reacting phthalic anhydride with aqueous hydrogen peroxide at a pH controlled to between pH 8 and 10, preferably pH 8.8 to 9.2 and a low temperature preferably maintained at 0.degree. to 5.degree. C, and thereafter removing diphthaloyl peroxide from solution, suitably by acidification and filtration. Preferably excess solid phthalic anhydride is employed and is filtered out before the solution is acidified. Desirably the concentration of active oxygen species is maintained at below 0.3 moles/liter.
Diphthaloyl peroxide is particularly suitable for bleaching/washing fabrics, optionally in conjunction with an inorganic persalt e.g. sodium perborate, at a temperature of from 30.degree. to 60.degree. C.

REFERENCES:
patent: 1614037 (1927-01-01), McKee
patent: 3674858 (1972-07-01), Le Barge
Tobolsky "Organic Peroxides," (1954) pp. 39-40.

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