PROCESS FOR PREPARING INSOLUBLE HYDROLYZABLE TANNIN, METHOD OF TREATMENT OF SPENT LIQUID WITH TANNIN INSOLUBLE HYDROLYZABLE TANNIN Russian patent published in 1996 - IPC

Abstract RU 2057137 C1

FIELD: purification of sewage. SUBSTANCE: the product: insoluble hydrolyzable tannin. Reagent 1: hydrolyzable tannin. Reagent 2: aqueous ammonia solution. Reaction conditions: prior to dissolution. Reagent 3: aqueous aldehyde solution. Reaction conditions: precipitate is formed which is then heated till the precipitate becomes insoluble in water. Reagent 4: agitation till the precipitate becomes insoluble in acid and alkali followed by filtration. EFFECT: more efficient preparation process. 8 cl, 1 dwg

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RU 2 057 137 C1

Authors

Vataru Sirato[Jp]

Esinobu Kamei[Jp]

Dates

1996-03-27—Published

1992-08-06—Filed