| 摘要 |
PROBLEM TO BE SOLVED: To obtain particles whose stability is remarkably improved and which is excellent in solubility by coating the sodium bicarbonate particles with a combination of alkali metal sulfite and magnesium sulfite and/or magnesium chloride in a specified ratio. SOLUTION: A combination of (A) 6 to 20 wt.% alkali metal sulfite and (B) 1.5 to 10 wt.% magnesium sulfite and/or magnesium chloride is sprayed in a state of water solution to granulated sodium bicarbonate particles having 300 to 1,000μm average particle size and is dried to form coating layers, thereby obtaining coated sodium bicarbonate particles. As for the order of coating, either a method in which coating with the compound (A) is done and then coating with the compound (B) is done, or a method in which contrary to the former, coating with the compound (B) is done and then coating with (A) may be used, however, a method in which the compound (A) and the compound (B) are mixed to do coating with the mixture is preferable because a coating process can be simplified.
|
