Device for producing crystals

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 9/00 (2006.01)

Patent

CA 2410154

The invention relates to a device and to a method for crystallizing substances from solutions or dispersions containing said substances in a crystallizer that comprises a classifying zone (3) and that is further provided with a) an inner and an outer circuit system (1; 2), the inner circuit system (1) being disposed in the crystallizer, the inlet of the outer circuit system (2) being linked with the inner circuit system (2) via a classifying zone (3), the outer circuit system (2) being disposed outside the crystallizer, the outlet of the outer circuit system (2) being linked with the inner circuit system (1) of the crystallizer, and a device for dissolving crystals being disposed in the outer circuit system (2) upstream of the outlet; b) a feed line (4) for the solution and/or dispersion, which is disposed on the crystallizer or on the outer circuit system; and c) an outlet (5) for dispersions that is disposed on the crystallizer or on the outer circuit system. The inventive device is especially characterized in that it is additionally provided with a line (8) for returning/guiding the dispersion that interlinks the outer and the inner circuit system (1; 2) and/or with a line (8) for returning/guiding the dispersion whose inlet and outlet are linked with the inner circuit system (1).

L'invention concerne un dispositif et un procédé permettant de faire cristalliser des substances à partir de solutions ou de dispersions les contenant, dans un cristalliseur pourvu d'une zone de triage (3), qui comporte: a) un système de circulation intérieure et un système de circulation extérieure (1; 2), le système de circulation intérieure (1) se trouvant dans le cristalliseur, l'orifice d'admission du système de circulation extérieure (2) étant relié au système de circulation intérieure (1) par l'intermédiaire de la zone de triage (3), le système de circulation extérieure (2) se trouvant à l'extérieur du cristalliseur, l'orifice d'évacuation du système de circulation extérieure (2) étant relié au système de circulation intérieure (1) du cristalliseur, et un dispositif de séparation des cristaux étant disposé dans le système de circulation extérieure (2), avant l'orifice d'évacuation de celui-ci; b) une conduite d'amenée (4), servant à amener la solution et/ou la dispersion, qui se trouve sur le cristalliseur ou sur le système de circulation extérieure; et c) une conduite d'évacuation (5), servant à l'évacuation des dispersions, qui est placée sur le cristalliseur ou sur le système de circulation extérieure. Le dispositif selon l'invention se caractérise en ce qu'il comporte en outre une conduite (8) reliant le système de circulation intérieure (1) au système de circulation extérieure (2), et/ou une conduite (8) servant à amener ou ramener la dispersion, dont l'orifice d'entrée et l'orifice de sortie sont reliés au système de circulation intérieure (1).

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