Method of treating polyaluminium compounds
AssigneeAkzo Nobel N.V.
InventorsKjell Andersson, Erik Lindgren
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method of treating polyaluminium compounds comprising contacting at least one polyaluminium compound in an aqueous solution with an anion exchange material capable of accepting anions or anionic groups and donating hydroxyl ions for a time necessary to obtain a polyaluminium compound having a higher molar ratio of hydroxide to aluminium than the polyaluminium compound had before contacting it with the anion exchange material.
Claims14
A method of treating polyaluminium compounds comprising contacting at least one polyaluminium compound in an aqueous solution with an anion exchange material capable of accepting anions or anionic groups and donating hydroxyl ions for a time necessary to obtain a polyaluminium compound having a higher molar ratio of hydroxide to aluminium than the polyaluminium compound had before contacting it with the anion exchange material.
A method of treating polyaluminium compounds comprising contacting at least one polyaluminium compound in an aqueous solution with an anion exchange material capable of accepting anions or anionic groups and donating hydroxyl ions for a time necessary to obtain a polyaluminium compound having a higher molar ratio of hydroxide to aluminium than the polyaluminium compound had before contacting it with the anion exchange material, wherein the method is carried out in a batch in which the polyaluminium compound and the anion exchange material are homogeneously stirred.
A method of treating polyaluminium compounds comprising contacting at least one polyaluminium compound in an aqueous solution with an anion exchange material capable of accepting anions or anionic groups and donating hydroxyl ions for a time necessary to obtain a polyaluminium compound having a higher molar ratio of hydroxide to aluminium than the polyaluminium compound had before contacting it with the anion exchange material, wherein the anion exchange material is loaded in a column through which the polyaluminium compound is passed.
Dependencies are inferred from the claim text.