Compacts of spray dried water soluble compounds
AssigneeKerr-McGee Chemical Corporation
InventorsRoger A. Baldwin, Virgil J. Barczak
Life of this patent
Estimating the term…
Abstract
The present invention is directed to articles of manufacture comprising solid compacts, formed at elevated pressures, from homogenous, finely divided powders of spray dried water soluble inorganic compounds. The solid compacts are characterized by their readily water dissolvable, substantially nondusting and dense nature.
Claims17
Articles of manufacture consisting of readily water dissolvable, substantially non dusting, solid compacts, said compacts being formed, by compaction or extrusion, at elevated pressures without introduction of moisture and without undergoing any further processing steps, from finely divided dry powders of spray dried water soluble alkali metal compounds selected from the group consisting of alkali metal borates, alkali metal halides, alkali metal sulfates, alkali metal carbonates and alkali metal bicarbonates wherein said alkali metal compounds have solubilities in water of at least 1.5 parts per 100 parts of water measured at 0.degree. C. and wherein said solid compacts exhibit rates of dissolution in water at least equal to the rates of dissolution of the powdery alkali metal compounds from which said solid compacts are formed.
Articles of manufacture comprising readily water dissolvable, substantially nondusting, dense, solid compacts formed, at elevated pressure ranging from about 70 kg/cm.sup.2 to about 5100 kg/cm.sup.2, from homogenous, finely divided powders of spray dried water soluble sodium borates consisting essentially of sodium and boron oxides present in a mole ratio of Na2O:B2O3 of from about 0.15 to about 0.30 and containing from about 4 to about 10 moles of water of hydration, said solid compacts being characterized by compressed densities ranging from about 1.1 g/cc to about 1.8 g/cc and a rate of dissolution in water at least equal to the rate of dissolution in water of the powdery sodium borate.
A method for producing a readily water dissolvable, substantially non-dusting, solid compact comprising:
- (1) providing finely divided dry powders of spray dried water soluble alkali metal compounds selected from the group consisting of alkali metal borates, alkali metal halides, alkali metal sulfates, alkali metal carbonates and alkali metal bicarbonates wherein said alkali metal compounds have solubilities in water of at least 1.5 parts per 100 parts of water measured at 0.degree. C.;
- (2) applying elevated pressures without introduction of moisture to said finely divided powders to form a solid compact wherein said solid compact exhibits a rate of dissolution in water at least equal to the rate of dissolution of the powdery alkali metal compound from which the solid compact is formed.
Dependencies are inferred from the claim text.