Method of preparing insoluble hydrolysable tannin and method...

Details Method of preparing insoluble hydrolysable tannin and method... Method of preparing insoluble hydrolysable tannin and method...

C - Chemistry, Metallurgy

07

G

C07G 3/00 (2006.01) C08H 99/00 (2010.01) B01D 15/00 (2006.01) B01J 20/24 (2006.01) C02F 1/62 (2006.01) G21F 9/12 (2006.01) C08H 5/00 (2006.01)

Patent

CA 2074796

ABSTRACT OF THE DISCLOSURE An insoluble hydrolysable tannin is prepared by dissolving a hydrolysable tannin powder in aqueous ammonia; mixing the resulting solution with an aldehyde aqueous solution to form a precipitate; heating the precipitate; mixing the heated precipitate with a mineral acid; and filtering the resulting mixture to leave a residue on a filter. The inventive insoluble tannin exhibits high adsorption properties for heavy metal elements and is insoluble in either water, acid, or alkali. Methods for treating waste liquids and recovering heavy metal elements therefrom using the inventive insoluble tannin are dis- closed.

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