Process for producing pharmaceutical grade aluminum hydroxide gels
AssigneeBarcroft Company
InventorGreen B. Glasscock
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Abstract
A process for producing aluminum hydroxide gels substantially free of sodium ions involves a heterogeneous reaction between an aqueous solution of a water soluble aluminum salt and an aqueous slurry of a water soluble alkaline earth carbonate.
Claims5
A process for producing aluminum hydroxide gels which comprises combining water, a water soluble salt of aluminum selected from the group consisting of aluminum chloride, aluminum sulfate and aluminum nitrate, and a water insoluble alkaline earth carbonate under heterogeneous reaction conditions while maintaining a reaction pH between 4.7 and 5.5 and isolating the aluminum hydroxide gel.
A process for producing aluminum hydroxide gels which comprises adding a 14 - 28% by weight aqueous solution of an aluminum salt selected from its chloride, aluminum sulfate and aluminum nitrate to a 4 - 10% by weight aqueous slurry of a carbonate selected from the group consisting of calcium and magnesium carbonate under agitated, heterogeneous reaction conditions while maintaining a reaction pH between 4.7 and 5.5 by adjustment of the relative amounts of the reactants, and isolating the aluminum hydroxide gel.
Dependencies are inferred from the claim text.