Process for the preparation of antacid aluminum hydroxycarbonate hydrate
AssigneeDr. Madaus & Co.
InventorsRolf Hermann Heinrich Madaus, Klaus Gorler
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Abstract
A basic aluminum hydroxycarbonate hydrate, usable as an antacid, is prepared by simultaneously adding aqueous solutions of aluminum sulfate and alkali hydrogen carbonate or alkali carbonate to water while maintaining a neutral or weakly alkaline pH and adjusting the pH-value of the reaction mixture, after completed precipitation, to about 6.0 by adding an aluminum salt of a strong acid.
Claims17
Process for the preparation of basic aluminum hydroxycarbonate hydrate which comprises simultaneously adding aqueous solutions of aluminum sulfate and alkali metal hydrogen carbonate or carbonate to water while maintaining an initial pH-value of from 6.8 to 7.8, permitting the resulting precipitation to run to completion, and then in a subsequent step, adding an aluminum salt of a strong acid to adjust the pH-value of the reaction mixture to about 6.0.
Dependencies are inferred from the claim text.