Mixer for mixing of liquids or suspensions and method for...

B - Operations – Transporting – 01 – F

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B01F 7/16 (2006.01) B01F 3/08 (2006.01) B01F 13/10 (2006.01) B01F 7/00 (2006.01)

Patent

CA 2203696

A mixer for liquid or suspensions comprises two mixing chambers (2, 3) provided each with an outer inlet (10, 12). The chambers are connected to each other in such a way that the first chamber (2) leads to the second chamber (3). A number of mixing elements (6, 7) are arranged on a rotating axis (5) which is common for the two chambers. The mixing elements have different shapes in the two chambers. In the first chamber (2) the mixing elements are arranged to achieve a mixing by means of large shear forces. In the second chamber the mixing elements are arranged to achieve a mixing by stirring mainly without shear forces. A method for continuous mixing comprises mixing a little amount of a first liquid with a considerably larger amount of a second liquid in a first mixing chamber in which the mixing takes place by way of high shear forces. The obtained mixture is subjected to mixing by stirring mainly without shear forces in a second mixing chamber.

Un mélangeur destiné aux liquides ou aux suspensions comprend deux chambres de mélange (2, 3) dont chacune est pourvue d'un orifice d'entrée externe (10, 12). Ces chambres sont raccordées entre elles de telle manière que la première chambre (2) conduit à la seconde (3). Un certain nombre d'éléments mélangeurs (6, 7) sont disposés sur un axe rotatif (5) commun aux deux chambres. Ces éléments mélangeurs présentent des formes différentes dans les deux chambres. Dans la première (2), ils sont agencés de façon à assurer le mélange par l'intermédiaire de forces de cisaillement importantes. Dans la seconde, ils sont agencés de façon à assurer le mélange par agitation, essentiellement sans générer de forces de cisaillement. Un procédé de mélange en continu consiste à mélanger une faible quantité d'un premier liquide avec une quantité considérablement supérieure d'un second liquide dans une première chambre de mélange dans laquelle des forces de cisaillement importantes assurent le mélange. Le produit obtenu est soumis à un mélange par agitation, essentiellement sans forces de cisaillement, dans une seconde chambre de mélange.

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