Polyaluminum chloride and aluminum chlorohydrate, methods and compositions: high-basicity and ultra high-basicity.

摘要

Method to increase the hydroxide content of compounds comprising the formula (I): Mm (OH) nXam-n wherein M is a metal that undergoes the reaction: (Compound I) MmXam (Compound II) + H2O Mm ( OH) nXam-n (I) + HX wherein M is Al, Zr, Ti, Fe or mixtures thereof; "A" is the valence of the metal ion; X is an anion; 0 n = m; m = 1; comprising the step of subjecting a solution of Compound I to conditions of electrodialysis to generate HX, such that the hydroxide content of Compound I is increased compared to the content in initial hydroxide of Compound I, provided that i . cation permeable membranes and anion permeable membranes or bipolar membranes and anion permeable membranes are used to; and ii. currents enrichment and depletion are formed by compounds of formula I, such that the HX concentration is reduced in the solution depletion, thereby providing Compound I in the current exhaustion with increased hydroxide content relative to Compound I prior to treatment.