DE2322895A1 - DISTILLATION OR ABSORPTION COLUMN - Google Patents

Description

D1PL.-INS. R. SPLANEMANN dipl-chem. dr. B. REITZNER - dipl.-ins. J. JUDGE

MUNICH HAMBURG

7c May 1973 Hydronyl Ltd » ⁸ ^ ^CHEN

Telephone (0811) 22 62 07 / "52 6209 Telegrams: Inveniius Münche'n

Stoke ^ on-Trent, 2504-I-8272

Staffordshire (England)

Patent application

Distillation or absorption column

The invention relates to distillation or absorption columns for continuously bringing gases and liquids into contact, especially downcomers which are used in such columns ,

A material part of Destinations = or absorption columns with horizontal plates or trays (hereinafter referred to as "trays") ₉ which are connected to downcomers which are in contact with the column wall, consists in the fact that the liquid flowing down through the downcomer flows into the floor below Flume formed past all such columns are cylindrical, and as a result of the flume areas form on the bottoms; over which the liquid hardly moves ο The presence of these stagnation areas

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OfilOlNAL INSPECTED

reduces the efficiency of the soil, because the gas that in these stagnation areas by the Liquid passes through, not thoroughly mixed with the liquid flowing out through the column will.

The main purpose of the invention is to provide a distillation or absorption column with a A drain or drain designed to eliminate or reduce the disadvantage.

The invention thus relates to a distillation or absorption column for continuously bringing gases and liquids into contact ₉ , the column being in the form of a vertically arranged cylinder with horizontal trays and traps arranged therein; The column is characterized in that at least one downcomer has the shape of a plate connected to the inner wall of the column * the lower part of which is arranged in such a way that the liquid flowing through the downcomer and reaching the area of the underlying tray flows over it Soil is inhibited in such a way that no vortices or stagnation areas are formed.

A variant of this column is characterized in that at least one downcomer has the shape of a plate connected to the inner wall of the column, the lower part of which is arranged so that all of the liquid flowing through the downcomer and reaching the area of the tray below is in their current movement

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is inhibited over this floor in such a way that there is a common residence time.

In 3 © de ^{m the} case, the lower edge of the plate is preferably shaped in such a way that the effects mentioned are achieved

Preferably, the lower edge of the plate (in plan view) has the shape of a curve, the ends of which are approximately at right angles to the inner wall of the Cylinder meet, this curve can be useful be a segment of a circle «The lower edge of the plate (in the front view) can be in the shape of a curve to have"

The stagnation areas are usually found in the usual arresters in the vicinity of the interior » wall of the column j, on the other hand, the liquid does not flow in the trap designed according to the invention only directly above the bottom »but also freely along the walls of the column, causing stagnation« zones are avoided and the efficiency of the column is increased <,

The invention is described below in the form of a non-limiting example with reference to the drawing.

FIG. 1 shows a schematic view of a column designed according to the invention;

FIG. 2 is a plan view of the column of FIG. 1;

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Figure 3 is a schematic front view of a part a further column designed according to the invention;

FIG. 4 is a schematic rear view of the column of FIG. 3;

FIG. 5 shows a plan view of a column designed according to the invention with the flow profile the liquid over a floor?

Figure 6 is a schematic front view of a part another column according to the invention?

7 is a schematic view of a rope of a further column according to the invention »

FIG. 8 shows a schematic view of a further column according to the invention; and

FIG. 9 shows a plan view of a column according to FIG Invention using baffles

In Figures 1 and 2 is a destination or absorption column 1 in the form of a vertically arranged cylinder with horizontal trays 2 and an arrester 3 in the form of a plate »the one with each Floor connected 1st »shown · Each downcomer or overflow 3 has a top edge 4- * of how is shown in Figure 2, with the circular column 1 forms a chord line and as a weir for serves the respective soil. The lower hand 5 each

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»5 -

Alileiters 3 let, as shown in Figure 2, curved, and the angle 6 at which the lower hand 5 of the downcomer 3 to the inner wall of the column is about a right angle. This angle 6 can also be an obtuse angle » The arrester 3 can gradually move from its straight upper hand 4 into its curved lower hand 5 pass over "

Bs _g was found that the arrester in the described manner, the flowing down through the arrester liquid upon reaching of the underlying soil so directed at a design of the lower strip 5 so that it flows in the direction indicated by the arrows of Figure 5 pattern. The liquid thus flows over the underlying tray 2 without the formation of eddies or stagnation zones which would impair the efficiency of the column. If the liquid flows in the manner indicated in FIG. flowing liquid in the soil has a common or equal residence time. A further embodiment is shown in FIGS. 3 and 4, in which a cylindrical column 8 is provided with horizontal bottoms 9. A stepped arrester 10 with an upper part is attached to it, the upper hand 12 of which forms a chord line with the circular column and the Has the shape of a flat plate. A lower part 13 of the arrester 10 is via a step 14 with the upper. Part 11 connected, and the lower hand 15 of the lower part 13 is curved, as in the first embodiment, in such a way that the liquid flows over the underlying floor without eddies or zones of stagnation. In this case Bform

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can the lower edge 15 of the lower part 13 of the Arrester also approximately at a right angle or at an obtuse angle on the inner wall of the Strike column 8.

In FIG. 6 there is a column 16 with the trays 17 and an arrester 18 shown »This figure shows only a small part of a column, the lower edge 19 of the arrester 13 is (seen from the front) curved, and such a curvature can also be used for the curved surface (in the top view) of Figures 2 and 5 may be present. Figure 6 shows that the plate (seen from the front) is curved * with the lowest point of the band being closest to the vertical axis of the column. The curvature (seen from the front) causes “that relatively more liquid flows along the walls of the column when the liquid flows over the underlying soil is passed, so that the residence time for practically all areas of the Liquid on the floor is the same.

A similar construction is shown in FIG. 7, but with the lower edge of an arrester has a horizontal central portion 21 and two end portions 22 inclined upwardly from the central portion 21; the End parts 22 have a similar effect as the curved lower edge of the arrester of FIG. 6.

In certain cases it may be desirable for the flow cross section to ruIes _c and for this purpose, each in figure 8 a movable, optionally slidably movable plate 23 at the lower end

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Atieiters 24, which is connected to the horizontal trays 25 in the horizontal column 26 "shown" The plates 23 can be adjusted manually from the outside in order to compensate for changing fluid loads

In the embodiment of Figure 9, a number of baffles 27 are used, which are at the lower end of the arrester 28 are attached in the column 29. These deflectors can have a streamlined shape, to reduce vortex formation as the liquid flows over their surfaces; they are arranged so that they the flow of exiting at the lower end of the drain liquid in steer in a similar way as in Figure 5 »

The construction of the arrester described above can be modified within the scope of the invention; for example, the lower hand can be formed from a series of straight edges (in plan view) instead of being curved. The lower edge can also be designed in such a way that the space under an arrester is partially closed. " For example, the lower edge can be sawtooth-shaped, have the shape of a wall crown or be shaped in some other way.

Although the invention relates to floors has been described with a single passage, it is also applicable to trays with multiple passages.

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Claims (1)

Expectations Distillation or absorption column for the continuous contact of gases and liquids "the column has the shape of a vertically arranged cylinder with horizontal trays and downcomers arranged therein, characterized" that at least one downcomer (3, 10, 18, 20 »24) has the shape one with the inner wall of the column (1 _f 8 "16, 26, 29) in connection, the lower part (5, 13, 19-22 _S 23) is arranged so that the draining and the The fluid reaching the area of the underlying soil (2 ₉ 9, 17 »25) is inhibited or influenced in its flow movement over this soil in such a way that no vortices or stagnation areas are formed. Column according to claim 1, characterized in that the lower edge (5, 13, 19s 22, 23) of the Plate is designed in such a way that this effect occurs » Column according to Claim 2 _e, characterized in that the lower edge (5, 13 »19, 22, 23) hits the column wall approximately at a right angle. 309847/0864 4 «column according to claim 3» characterized in that that the lower edge (5, 13, 19 »23) of the plate (in plan view) is curved over its entire length is. · 5ο column according to claim 4 »characterized in that that the lower edge (5, 13, 19 »23) of the plate (in plan view) forms an arc» 6ο column according to claim 1, characterized in that » that the lower end of the plate (28) 'is provided with baffles (27) " 7 ο column according Anspruoh 6, characterized in that the Ablenkbleohe are streamlined. 8ο column according to one of claims 1 to 7, characterized characterized in that the lower edge (19, 22) of the plate (in the front view) is curved, the lowest point of the edge being closest to the vertical axis of the column. 9. Column according to one of Claims 1 to 10, characterized in that the lower edge of the plate (20) (in the front view) has a horizontal central part (21) and two end parts (22) inclined upwards from the central part. 10. Destinations "- or absorption column sum continuous bringing in of gases and liquids, the column has the front of a vertically arranged cylinder with horizontal stalls and traps arranged therein, because" duroh characterized that at least "in traps (3, 10, 18, 20, 24) the shape of a with the 309847/0884 Inner wall of the column (1, 8, 16, 26, 29) has communicating plate; its lower part (5 »13, 19, 22, 23) is arranged in such a way that the entire amount flowing through the trap and the The flow movement of the liquid reaching the area of the underlying floor (2, 9 »17 * 25) About this soil därart inhibited or influenced is that there is a common dwell time. ο column according to one of claims 1 to 10, characterized characterized in that the lower part (23) of the plate (24) is opposite the remainder of the plate is adjustable? to adjust the cross-section of the underflow « 12o column according to one of claims 1 to 11, characterized characterized in that all traps in the column are similar to achieve the desired effect are constructed » 309847/0864 Blank page