Purification of saline solutions
AssigneeICI Australia Limited
InventorNorman H. Pilkington
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Abstract
A process for the demineralization of a bicarbonate- or bisulphite-bearing saline solution by means of amphoteric thermally regenerable ion-exchange resins and comprising the regeneration of the resins using as a regenerating agent a solution which is more acidic by a chosen amount than is the saline solution.
Claims17
A process of regenerating a thermally regenerable amphoteric ion exchange material which has been used to demineralize at a first temperature a saline solution by absorbing ionic species from said saline solution, which solution comprises at least one type of ion selected from the group consisting of bicarbonate and bisulphite, wherein said ion exchange material is treated with an aqueous regenerating solution at a second temperature which is greater than said first temperature so that at least a portion of the ionic species absorbed on said material is transferred to said aqueous regenerating solution, characterized in that said aqueous regenerating solution has a pH value which is less than the first pH value of said saline solution by no more than 2.0 units.
Dependencies are inferred from the claim text.