C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
C11D 3/39 (2006.01) B01J 2/00 (2006.01) B01J 2/16 (2006.01) C01B 15/10 (2006.01) C11D 17/00 (2006.01)
Patent
CA 2141453
A process to manufacture and coat a sodium carbonate perhydrate containing 10.5 % to 14 % active oxygen which is stable in a non-phosphate detergent composition and which has a bulk density of from 900 to 1,050 kg/m3. Anhydrous sodium carbo- nate with a pore volume of at least 0.29 ml/g is contacted with 50 % to 75 % by weight hydrogen peroxide in the presence of 1-hydroxyethylidene-1,1-diphosphonic acid and water is evaporated at a rate to maintain a dry reaction mixture. The pro- duct is coated by sparging sodium borosilicate at a rate to avoid moistening the particles.
Guiliano Basil A.
Hills William A.
Juelke Charles V.
Fmc Corporation
Osler Hoskin & Harcourt Llp
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