Beer clarification process by crossflow-microfiltration

C - Chemistry – Metallurgy – 12 – H

Patent

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Details

C12H 1/00 (2006.01) B01D 61/14 (2006.01) B01D 61/22 (2006.01) B01D 65/02 (2006.01) B01D 65/06 (2006.01) C12H 1/07 (2006.01) C12M 1/12 (2006.01)

Patent

CA 2158071

A beer crossflow-microfiltration process is disclosed. In order to avoid fouling of the filter module membrane by the ingredients of the non-clarified beer to be filtered out and that form a covering layer on the membrane, filtration is interrupted from time to time. During a following short pause, the covering layer on the membrane is chemically dissolved with lye, and the covering layer is removed by backflushing the membrane with water. In order to improve filtration, the transmembrane differential pressure (p) is controlled during the filtration phase according to a substantially periodical time function and the flow velocity (v) of the beer through the membrane is substantially continuously increased.

L'invention concerne un procédé de microfiltration tangentielle de bière. Afin d'éviter le colmatage de la membrane du module de filtrage par les éléments constitutifs de la bière non clarifiée à filtrer qui se déposent sur la membrane sous forme d'une couche de colmatage, la filtration est interrompue de temps en temps. Pendant une courte pause qui suit l'interruption, la couche de colmatage déposée sur la membrane est chimiquement attaquée par une lessive, puis la couche de colmatage est enlevée à contre-courant de la membrane avec de l'eau. Afin d'améliorer la filtration, la différence de pression transmembranaire (p) est commandée pendant la phase de filtration selon une fonction temporelle sensiblement périodique et la vitesse tangentielle (v) de la bière à travers la membrane est augmentée de manière sensiblement continue.

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