Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Patent
1977-09-27
1978-10-03
Thomas, Earl C.
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
C01B 1510
Patent
active
041184661
ABSTRACT:
A compact, abrasion resistant sodium percarbonate is produced by reacting sodium carbonate with hydrogen peroxide. There is employed a solution saturated in sodium percarbonate and also containing (1) sufficient sodium carbonate that there is present sodium carbonate decahydrate as a solid phase, (2) sodium chloride in an amount of 100 to 200 grams per liter, (3) an active oxygen stabilizer and (4) sodium hexametaphosphate in an amount of 0.1 to 1.9 grams per liter. There is added hydrogen peroxide in an amount about equivalent to the dissolved sodium carbonate which results in a supersaturated solution of sodium percarbonate. The supersaturation is broken down by precipitation of sodium percarbonate during the addition of the hydrogen peroxide and up to 60 minutes thereafter. The entire process is carried out at a substantially constant temperature within the range of 10.degree. to 20.degree. C. The precipitated sodium percarbonate is separated and dried and the mother liquor can be returned to the first step of the process.
REFERENCES:
patent: 2541733 (1951-02-01), Young
Klebe Hans
Knippschild Gerd
Schuster Hubert
Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
Thomas Earl C.
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