The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 1978
Filed:
Sep. 27, 1977
Deutsche Gold-und Silber-Scheideanstalt vormals Roessler, Frankfurt am Main, DE;
Abstract
A compact, abrasion resistant sodium percarbonate is produced continuously by reacting sodium carbonate and hydrogen peroxide in the presence of sodium percarbonate inocculant seeds, sodium chloride, an active oxygen stabilizer and sodium hexametaphosphate at 10-20.degree. C, the process comprises feeding into the preliminary inocculant and aqueous hydrogen peroxide solution containing an active oxygen stabilizer and simultaneously either (1) a filtered solution saturated in sodium carbonate and containing 40-100 grams per liter of sodium percarbonate, 0.1-1.0 gram of sodium hexametaphosphate per liter, 100-200 grams of sodium chloride per liter and an active oxygen stabilizer or (2) a mother liquor containing 40-100 grams of sodium percarbonate per liter, 0.1-1.0 gram of sodium hexametaphosphate per liter, 100-200 grams of sodium chloride per liter and an active oxygen stabilizer, with the proviso that when the mother liquor is employed there is also fed into the preliminary inocculant such an amount of calcined soda that no sodium carbonate decahydrate forms as a solid phase in the preliminary inocculant, the amount of hydrogen peroxide employed being approximately equivalent to the amount of dissolved sodium carbonate for reaction, the temperature is maintained constant during the entire process of precipitating sodium percarbonate, the supersaturation initially formed upon addition of the hydrogen peroxide being reduced by the precipitation of the sodium percarbonate, the precipitated sodium per carbonate is separated and dried.