Method of preparing insoluble hydrolysable tannin and method of

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

1992-07-23

1993-12-28

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C07C 6988

Patent

active

052741699

ABSTRACT:
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 disclosed.

REFERENCES:
patent: 404440 (1889-06-01), Saarbrach
patent: 495768 (1893-04-01), Austen
patent: 517626 (1894-04-01), Reinus
patent: 2173977 (1939-09-01), Oberjell
patent: 4090919 (1978-05-01), Chibata et al.

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