Method for fractionating a solution

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 15/08 (2006.01) D21C 11/00 (2006.01) B01D 15/18 (2006.01) C12F 3/06 (2006.01)

Patent

CA 2188262

The invention relates to a method for fractionating a solution by a chromatographic simulated moving bed method in which the liquid flow is effected an a system comprising at least two sectional packing material beds in different ionic forms. The fractions enriched with different components are recovered during a multi-step sequence comprising the following operations, i.e. phases: feeding phase, eluting phase and recycling phase. The liquid present in the sectional packing material beds with its dry solids concentration profile is recycled during the recycling phase in a loop comprising one, two or more sectional packing material beds. The method can be employed for fractionating sulphite cooking liquor, molasses and vinasse, for example.

L'invention se rapporte à un procédé de fractionnement d'une solution selon un procédé chromatographique à simulation de lits mobiles, dans lequel l'écoulement du liquide s'effectue dans un système comprenant au moins deux lits de matériau de garnissage en sections sous différentes formes ioniques. Les fractions enrichies de différents constituants sont récupérées au cours d'une séquence en plusieurs étapes comprenant les opérations, ou phases, suivantes: une phase d'alimentation, une phase d'élution et une phase de recyclage. Le liquide présent dans les lits de matériau de garnissage en sections, présentant un profil de concentration en matières sèches déterminé, est recyclé au cours de la phase de recyclage dans une boucle comprenant au moins un ou deux lits de matériau de garnissage à sections. Ce procédé peut être utilisé pour le fractionnement, notamment, de la lessive de cuisson de sulfite, de la mélasse et de la vinasse.

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