Insoluble tannin preparation process, waste treatment...

Details Insoluble tannin preparation process, waste treatment... Insoluble tannin preparation process, waste treatment...

C - Chemistry, Metallurgy

07

G

260/120, 362/47

C07G 3/00 (2006.01) C02F 1/00 (2006.01) C02F 1/28 (2006.01) G21F 9/12 (2006.01)

Patent

CA 2033381

There is disclosed an insoluble tannin preparation process, in which a tannin is first dissolved in an aldehyde aqueous solu- tion. Then, ammonia is added to the solution to produce a pre- cipitate, and the resulting precipitate is subjected to aging. The insoluble tannin thus prepared is employed to treat a waste liquid. Furthermore, there is disclosed an adsorption process in which a tannin is first dissolved in a solution containing a material to be adsorbed. Thereafter, an aldehyde is added to the solution to produce a precipitate having tannin as a principal constituent. The material to be adsorbed is adsorbed to this precipitate.

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