Tannin extraction

C - Chemistry – Metallurgy – 07 – G

Patent

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260/120, 23/411

C07G 99/00 (2009.01) C08H 8/00 (2010.01) B01D 11/02 (2006.01) B01D 29/76 (2006.01)

Patent

CA 2037041

Method for extracting tannins from bark and mufti-stage apparatus suitable therefor. The method includes the steps of contacting bark containing tannins with a first tannin enriched aqueous wash medium at elevated temperatures; separating the tannin-rich liquid extract by filtration including dewatering the resulting filter cake under pressure; washing the filter cake with a plurality of aqueous wash media at elevated temperatures; and separating the tannin enriched media after each washing stage by filtration including dewatering the filter cake under pressure; wherein each successive wash medium has a lower degree of tannin enrichment than the preceding wash medium.

Procédé servant à extraire des tannins de l'écorce et appareil multi-étages adapté à cette fin. Le procédé consiste à: mettre l'écorce qui contient les tannins en contact avec un premier milieu de lavage aqueux enrichi au tannin à température élevée; séparer l'extrait liquide riche en tannin par la filtration, laquelle comprend l'égouttage sous pression du gâteau de filtre ainsi obtenu; laver le gâteau de filtre avec une pluralité de milieux de lavage aqueux à température élevée; et à séparer les milieux enrichis au tannin après chaque étage de lavage par la filtration, laquelle comprend l'égouttage sous pression du gâteau de filtre; chaque milieu de lavage successif ayant un degré d'enrichissement au tannin moins élevé que celui du milieu de lavage précédent.

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