A method and device for separating a substance from a liquid...

B - Operations – Transporting – 01 – D

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B01D 9/02 (2006.01) B01D 9/00 (2006.01)

Patent

CA 2206757

For the purpose of separating a substance from a liquid mixture by crystallisation, the inner walls of pipes in a crystalliser (S-1, S-2, S-3) are cooled by evaporating a liquid medium, the pressure of the gaseous phase of the medium being controlled in accordance with the temperature required for crystallisation. In these conditions a layer of crystals forms on the outer walls of the pipes and can later be melted. The previously- formed crystal layer is melted in one crystalliser simultaneously with crystallisation in another crystalliser. This is done by introducing gaseous medium which is produced in a crystalliser during the said evaporation. In addition, heat energy can be supplied to the crystalliser where melting occurs, in order to evaporate liquid medium there so that melting is accelerated. The two simultaneously operating crystallisers operate respectively as an evaporator and as a condenser in a refrigerating unit (11), thus saving considerable energy compared with known crystallisation methods.

Pour séparer une substance d'un mélange liquide par cristallisation, il faut refroidir les parois intérieures des tuyaux d'un cristallisateur (S-1, S-2, S-3) par évaporation d'un support liquide, la pression de la phase gazeuse du support étant réglée selon la température de cristallisation. Il se forme alors une couche de cristaux sur les parois extérieures des tuyaux que l'on peut ensuite faire fondre dans un cristallisateur, en même temps que se produit la cristallisation dans un autre cristallisateur. Cela se fait par l'introduction du support gazeux produit dans un cristallisateur au cours de l'évaporation. Il est possible d'utiliser l'énergie thermique dans le cristallisateur utilisé pour la fonte, afin de causer l'évaporation du support liquide et d'accélérer la fonte. Les deux cristallisateurs, qui fonctionnent en même temps, servent respectivement d'évaporateur et de condensateur à une unité de réfrigération (11), économisant ainsi beaucoup d'énergie par rapport aux méthodes de cristallisation connues.

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