TRAYS OF CONTACT VAPOR-LIQUIDO FOR COLUMNS OF MASS TRANSFER AND METHOD OF SUPPORT OF THESE TRAYS.

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A mass transfer column ( 20 ) is provided with an external shell ( 22 ) defining an open internal region ( 24 ). Centrifugal contact trays ( 26 ) and return contact trays ( 28 ) are positioned in an alternating and vertically spaced apart relationship within the open internal region ( 24 ). Each contact tray ( 26 ) and ( 28 ) has a plurality of vapor passages ( 34 ) for allowing vapor to flow upwardly through the tray deck ( 30 ) and ( 31 ), respectively, to interact with liquid on the surface of the tray deck. At least one center downcomer ( 42 ) extends downwardly at an opening in the return tray deck ( 31 ) and has a lower discharge outlet ( 54 ). At least one annular downcomer ( 38 ) extends downwardly the periphery of the centrifugal tray deck ( 30 ) and has a lower discharge outlet ( 48 ) spaced above the return tray deck ( 31 ) for feeding liquid onto the return tray deck ( 31 ). A plurality of baffles ( 60 ) extend upwardly from the return contact tray ( 28 ) at the center downcomer ( 42 ) and transfer a portion of the load of the centrifugal contact tray to the return contact tray. A center support plate ( 58 ) is positioned between upper ends of the baffles ( 60 ) and the overlying centrifugal contact tray ( 26 ) to provide a greater area of support. A support ring ( 66 ) is secured to the column shell ( 22 ) and a pair of support beams ( 62 ) is secured to the support ring ( 66 ) and the center downcomer ( 42 ) to transfer the load to the column shell ( 22 ). Bolting clips ( 71 ) extend between the annular downcomer ( 38 ) and another support ring ( 70 ) to transfer another portion of the centrifugal contact tray load to the column shell ( 22 ).