Pervaporation apparatus and method

B - Operations – Transporting – 01 – D

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B01D 61/36 (2006.01) B01D 53/22 (2006.01) B01D 63/08 (2006.01)

Patent

CA 2439996

Pervaporation or vapor permeation apparatus and method having aseparator module (11, 12, 65, 96) located in an unpressurized tank (13, 63, 88, 95). The module has a plurality of stacked, disk-like separator elements (15, 24, 67, 116) mounted on a central, axial permeate removal tube (14, 66). The separator elements have a central permeate transport plate (48), a pervaporation membrane (51) enveloping the permeate transport plate and annular sealing rings (85) located between adjacent membranes, so that fluid has to pass through the membranes to enter the permeate removal tube. A vacuum applied to the permeate removal tube draws permeate through the pervaporation membranes and permeate transport plates into the permeate removal tube. The permeate can be condensed right in the permeate removal tube by direct contact condensation using chilled liquid permeate, however an external condenser can be used. Jets of solution or bubbles (77) of permeate vapor passing between the separator elements reduce or prevent concentration polarization.

L'invention concerne un procédé et un appareil de pervaporation ou de perméation par la vapeur muni d'un module de séparateur (11, 12, 65, 96) disposé dans un réservoir (13, 63, 88, 95). Le module comporte plusieurs éléments séparateurs empilés en forme de disques (15, 24, 67, 116), montés sur un tube central axial d'évacuation de perméat (14, 66). Les éléments séparateurs ont une plaque centrale de transport de perméat (48), une membrane de pervaporation (51) enveloppant la plaque centrale de transport de perméat et des anneaux d'étanchéité annulaires (85) disposés entre les membranes adjacentes de manière à ce que le fluide passe à travers les membranes pour pénétrer dans le tube d'évacuation de perméat. Le perméat peut être condensé directement dans le tube d'évacuation de perméat au moyen de la condensation par contact direct qui utilise le perméat liquide glacé; on peut cependant utiliser un condenseur externe. Des jets de solution ou des bulles (77) de vapeur de perméat passant à travers les éléments séparateurs réduisent ou empêchent la polarisation de concentration.

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