Process and apparatus for size selective separation of...

B - Operations – Transporting – 01 – D

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B01D 61/00 (2006.01) B01D 9/02 (2006.01) B01D 11/04 (2006.01) B01D 61/14 (2006.01) C30B 7/00 (2006.01)

Patent

CA 2351523

A process and apparatuses (10) are provided for continuously harvesting particles from organic solution-laden near critical and supercritical fluids. Broadly, the processes and apparatuses utilize a filter or separator (56) comprising a thin membrane (70) supported on a sintered stainless steel tube (72). A feed stream comprising the desired particles, a supercritical antisolvent for the particles (preferably CO2), and a solvent for the particles, is contacted with the membrane layer of the filter under supercritical conditions for the mixture of antisolvent and solvent. The preferred antisolvents are substantially miscible with the solvent and have a critical temperature of less than 160 °C. The desired particles are retained by the filter while the solvent and most of the antisolvent pass through the filter, resulting in separation of the particles from the solvent.

L'invention concerne un procédé et des appareils (10) permettant d'extraire en permanence des particules de fluides supercritiques et quasi critiques chargés de solution organique. L'invention concerne de manière plus générale des procédés et des appareils utilisant un filtre ou un séparateur (56) comprenant une fine membrane (70) reposant sur un tube en acier inoxydable fritté (72). Un flux d'entrée comprenant les particules souhaitées, un anti-solvant supercritique pour les particules (de préférence CO2) et un solvant pour les particules est mis en contact avec la membrane du filtre dans des conditions supercritiques. Les antisolvants sont de préférence miscibles avec le solvant et présentent une température critique inférieure à 160 DEG C. Les particules souhaitées sont retenues par le filtre alors que le solvant et la plupart de l'antisolvant traversent le filtre, ce qui se traduit par la séparation des particules du solvant.

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