Process for preparing microcrystalline perborate products
AssigneePeroxid-Chemie GmbH
InventorsRichard Roesler, Werner Doetsch, Werner Zeiss, Rudolf Siegel
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Abstract
A process for preparing microcrystalline perborate hydrate products and highly concentrated, storage stable aqueous solutions used for this purpose which have a stable active oxygen content and a boron content of 3 to 8% by wt. based on the total weight of the solution. The products of the invention are suitable for numerous uses in the field of bleaching agent, disinfectant and liquid detergent formulations, and other fields of use.
Claims40
A process for preparing microcrystalline perborate products, comprising the steps of:
- a) reacting a liquid aqueous composition A, which contains an inorganic boron-oxygen compound, hydrogen peroxide and a quantity of an alkali metal hydroxide such that the molar ratio of alkali metal to boron is at most 0.75:1, with a basic inorganic alkali metal compound to form a solution B, wherein said basic inorganic alkali metal compound and said composition A are used in such quantities that the molar ratio of alkali metal to boron in said solution B is at least 0.80:1 and the boron concentration in said solution B is 1 to 4.5% by wt. based on the weight of the solution, and
- b) cooling the resulting solution B and crystallizing a perborate product.
A storage stable, aqueous solution containing quantities of inorganic boron-oxygen compound, hydrogen peroxide and sodium hydroxide such that the boron content of said solution is 3 to 8% by wt based on the total weight of the solution, the molar ratio of sodium to boron is from 0.55:1 to 0.70:1, and the molar ratio of active oxygen to boron is at least 0.9:1.
Dependencies are inferred from the claim text.