GB734458A - Spray grid tray contacting column - Google Patents

Abstract

734,458. Contacting gases with liquids. NAAMLOOZE VENNOOTSCHAP DE BATAAFSCHE PETROLEUM MAATSCHAPPIJ. June 10, 1953, No. 16050/53. Class 55 (2). A gas-liquid contact column comprising a plurality of transverse trays each of which has a plurality of narrow slots through which the gas and liquid flow has for at least one of the trays one or more reservoirs for fluid extending over part only of the tray area, the reservoir or reservoirs being in fluid-flow communication at a plurality of points distributed over the tray area with one of the bodies of fluid which collect in operation above and below the tray, and wherein a conduit is provided -which extends to a point outside the column and is connected to the reservoir or reservoirs. As shown in Fig. 1 a distillation column 10 comprises a number of trays 17 formed by parallel spaced bars 19 supported on an annular ring 21 secured to the shell of the column and by members 22 arranged at right angles to the bars 19. Liquid is supplied to the column through an inlet 12 to the tray 23 which comprises spaced bars 19, a ring 21 and members 22 and additionally an annular ring 24 andL-brackets 26 supporting a hollow cylindrical member 25 defining with the shell of the column an annular space which receives liquid from the inlet 12 and which communicates with the tray 23 through openings 27 arranged between the lower edges of the member 25 and the ring 24. A tray for liquid withdrawal is shown at 33 and comprises spaced bars 19 supported within a hollow cylindrical member 35 which in conjunction with an annular ring 34 and the walls of the column forms an annular space from which pipes 36 lead off some of the liquid retained on the bars 19, the height of the member 35 above the bars being less than the depth of liquid normally retained thereon. Gas may be withdrawn at a point intermediate the gas inlet 15 and outlet 11 by a tray 28 which has a series of elongated inverted basins 29, 291 and 29<SP>11</SP> replacing some of the spaced bars 19 and communicating with a gas withdrawal pipe 30 valved at 31. Screens 32 may be provided to prevent entrainment of liquid with the withdrawn gas. Gas is supplied to the column at the tray 50 (Fig. 9) through an inlet 52 leading to an inverted basin 51 located centrally of the spaced bars of the tray and having a deflecting device 53 to distribute the incoming gas evenly in the space below the tray. In modifications liquid may be supplied or withdrawn by means of cylindrical basins arranged centrally and resting on the spaced bars of the tray. In a further modification a liquid withdrawal basin may be of cruciform shape.