Coated single particles and their use in fluid bed...

B - Operations – Transporting – 01 – D

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B01D 15/02 (2006.01) B01J 8/20 (2006.01)

Patent

CA 2259061

A fluidized bed chromatographic process for purification and binding of molecules in a liquid by binding the molecules to an active substance covalently bound to chromatographic adsorbent particles in which process a fluidized bed of the adsorbent particles is formed and the liquid is passed through the fluidized bed, the improvement wherein the chromatographic adsorbent particles comprise a porous composite material having pores allowing access to the interior of the composite material by the molecules, and the porous composite material of each absorbent particle consists of a single density controlling particle which is either (a) a hollow low density particle which is impermeable to the liquid and has a density providing floatation of the adsorbent particle in the liquid or, (b) a high density particle having a density providing sedimentation of the adsorbent particle in the liquid, a matrix formed by consolidating at least one conglomerating agent selected from the group consisting of natural and synthetic organic monomers and polymers and an active substance for binding molecules in the liquid, the density controlling particle being embedded in the matrix, and the active substance being covalently bound to the matrix, the adsorbent particles having a relative density with respect to the liquid which is less than 0.95 or greater than 1.1 and a particle size within the range of 1-1000 µm, and each of the relative density and particle size range of the adsorbent particles being selected to provide desired floatation/sedimentation properties of the adsorbent particles in the liquid in the fluidized bed process with substantially no turbulence in the fluidized bed.

Procédé chromatographique à lit fluidisé pour la purification et la liaison de molécules dans un liquide, consistant à lier les molécules à une substance active liée elle-même par covalence à des particules chromatographiques adsorbantes; dans ce procédé, on forme un lit fluidisé de particules adsorbantes et on fait passer le liquide à travers le lit; c'est un procédé amélioré, en effet les particules chromatographique adsorbantes comprennent un matériau composite poreux, dont les pores laissent entrer les molécules à l'intérieur dudit matériau, et le matériau composite poreux de chaque particule adsorbante est constitué d'une particule unique déterminant la densité, qui est (a) soit une particule creuse de faible densité, imperméable au liquide, densité qui fait flotter la particule adsorbante dans le liquide, (b) soit une particule de densité élevée, faisant déposer la particule adsorbante dans le liquide, matrice formée par consolidation d'au moins un agent de conglomération choisi dans le groupe constitué de monomères et de polymères, organiques, naturels et synthétiques, et d'une substance active, liant les molécules dans le liquide; la particule déterminant la densité est enchâssée dans la matrice, et la substance active est liée par covalence à la matrice; les particules adsorbantes ont une densité relative par rapport au liquide, inférieure à 0,95 ou supérieure à 1,1, et une taille de 1-1000 microns; les plages de densité relative et de taille des particules adsorbantes sont choisies de façon à obtenir les propriétés de flottation/dépôt recherchées pour ces particules dans le liquide du procédé à lit fluidisé, avec pratiquement aucune turbulence dans ce dernier.

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