Process for manufacturing granular sodium percarbonate
AssigneeOriental Chemical Industries Co., Ltd.
InventorsSang Ryul Kim, Chong Yun Kwag, Hwan Kee Heo, Jong-Pill Lee
Life of this patent
Estimating the term…
Abstract
This invention relates to a process of manufacturing granular sodium percarbonate and more particularly, to a process of a stable granular sodium percarbonate detergent composition having an excellent solution velocity when added to water, comprising the following steps: hydrogen peroxide solution is directly sprayed to unpurified anhydrous sodium carbonate to produce granular sodium percarbonate followed by the addition of a stabilizer having a new composition in a reactor or fluidized bed dryer, then recycling sodium percarbonate particles which are of nonuniform particle size back into the process for continuous manufacturing.
Claims13
A process for manufacturing sodium percarbonate which comprises initially charging a reactor with solid sodium carbonate and at least one material selected from:
- (a) a sodium silicate aqueous solution expressed by the chemical formula
- Na.sub.2 O,n(SiO.sub.2), x(H.sub.2 O)
- wherein, n is 1 to 4 and x is 0 to 9 or sodium silicate in granule or powder form and its aqueous solution;
- (b) a higher fatty acid or ester thereof with a carbohydrate or polyol or a composition where a polyoxyethylene is added to said ester;
- (c) a pyridine compound or its salts having one or more carboxyl groups as a substituent;
- or
- (d) an aromatic or aliphatic amine and its salts having one or more sulfonic acid groups or carboxyl groups;
- spraying the sodium carbonate with hydrogen peroxide solution under flowing air, at a temperature from about 20.degree. C. to about 80.degree. C.;
- and stirring the reactants to thereby obtain sodium percarbonate;
- continuously drying the sodium percarbonate obtained;
- and wherein nonuniform particle size sodium percarbonate formed by the process is recycled for continuous manufacturing.
Dependencies are inferred from the claim text.