Removal of dissolved organic matter from acidic aqueous solution
AssigneeImi Tami Institute for Research and Development Ltd.
InventorAlexander Alon
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Abstract
An aqueous solution of a mineral acid is freed of dissolved or colloidally dispersed organic matter by admixing to the solution an aldehyde or an aldehyde oligomer and a compound copolymerizable with an aldehyde, allowing a polymerization reaction to occur and separating the resulting polymer. The polymer that forms removes selectively from the solution the said organic matter and any suspended organic matter is also removed. The aldehyde and the compound copolymerizable therewith may be added in the form of a pre-condensate.
Claims12
A process for the purification of an aqueous mineral acid solution containing dissolved organic matter, comprising adding to said solution a first, water-soluble compound being an aldehyde or an oligomer thereof and a second compound capable of polymerizing together with said first compound under the strongly acidic conditions within the solution, or a precondensate of said first and second compounds which precondensate is capable of further polymerization under the strongly acidic conditions within the solution, allowing the polymerization of the said first and second compounds or the said precondensate to occur within said solution to form a polymer insoluble in said mineral acid solution which polymer forms a precipitate by coprecipitation with said organic matter, and recovering a refined mineral acid solution from the resulting mixture.
Process according to claim 9, wherein said mineral acid is phosphoric acid.
Dependencies are inferred from the claim text.