Process for preparing stabilized sodium percarbonate

Details Process for preparing stabilized sodium percarbonate Process for preparing stabilized sodium percarbonate

1977-05-17

1978-09-26

Thomas, Earl C.

Chemistry of inorganic compounds

With additive

Additive contains metal, boron, or silicon

423415P, C01B 1510

Patent

active

041170873

ABSTRACT:
Stabilized crystalline sodium percarbonate is prepared by reacting a soda solution or suspension, which has a pH value of between 10 and 11 and contains an amount of a soluble silicate, e.g., sodium waterglass, which is equivalent to from about 0.2 to about 0.9% of SiO.sub.2 relative to the sodium percarbonate, with a hydrogen peroxide solution which contains a heavy metal complexing agent, allowing to crystallize at least 50% of the sodium percarbonate and then adding to the resulting suspension a second amount of a water soluble silicate which is equivalent to from about 0.2 to about 0.8% of SiO.sub.2 relative to the sodium percarbonate and is sufficient to provide a silicate content in the final product equivalent to 0.5 to 1.5% of SiO.sub.2.

REFERENCES:
patent: 1225722 (1917-05-01), Schaidhauf
patent: 2448058 (1948-08-01), Slater et al.
patent: 2541733 (1951-02-01), Young
patent: 3860694 (1975-01-01), Jayawant

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