JPH0583300B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention is applied to a packed tower for fluid contact such as a distillation tower, an absorption tower, a cooling tower, and a stripping tower to enable contact between both gases, both liquids, gas and liquid, and gas and liquid and catalysts. This invention relates to a fluid contact packing for efficient fluid contact. [Prior art] This type of filling includes beads, pellets, rings, plate pieces, and other shaped irregular fillings made of ceramics, glass, metal, synthetic resin, etc., and irregular fillings made of the above-mentioned materials. It is broadly classified into regular packing, which is regularly filled with a repeating structure of various shapes. Among these packings, the former packing has the advantage of being easy to fill into the column, but has the problem of large pressure loss and a tendency to cause fluid channeling. For this reason,
The use of the latter type of packing, which requires time and effort to fill into the column but causes less pressure loss, has become mainstream. [Problems to be Solved by the Invention] By the way, the latter packing, that is, the ordered packing, has a large number of flow passages that are substantially parallel to the axial direction of the column, as is clear from the honeycomb structure that is a typical example. Although this method has the advantage that the pressure loss is smaller than that of irregular packing, there is a problem that gas blow-by phenomenon tends to occur particularly in the low irrigation volume region, and the fluid contact efficiency decreases. [Means for Solving the Problems] The present invention relates to the latter type of regular packing, which is a fluid contact packing. It is characterized by being an assembly having a large number of gaps through which fluid flows between each rod-shaped body. As raw materials for the filling of the present invention, suitable ceramic raw materials such as porcelain, mullite, alumina, silica, cordierite, and zirconia are normally used.
A rod-shaped body is formed by, for example, extrusion molding each raw material. The rod-shaped body is cut to a predetermined length,
The cut rod-shaped bodies are intersected with each other at a predetermined angle of inclination, and are bonded to each other via an adhesive at each intersection. The filler of the present invention is formed by firing such an aggregate. In the packing, each rod-like body may be linear or helical. It is preferable that the rod-like bodies that are connected to each other be inclined at symmetrical angles with respect to the axial direction of the packed tower, and that the rod-like bodies that are adjacent to each other in a non-combined state are in a positional relationship that is parallel to each other. . The rod-shaped body is preferably a rod-shaped body having a curved surface such as a cylinder or an elliptical cylinder, and may be hollow. Further, it is preferable that the surface of each rod-like body has a thin uneven shape, and the porosity per volume of the filling is preferably at least 50%. [Operations and Effects of the Invention] When the interior of the packed material having such a structure exhibits a three-dimensional network structure, and the fluid flowing in from one end of the packed tower and the fluid flowing in from the other end are both gases. In order to improve the contact efficiency between the two, a large number of voids are uniformly distributed three-dimensionally. In addition, when the descending fluid is a liquid and the rising fluid is a gas, the descending liquid is dispersed in a thin film on the surface of each rod-like body, and at the joining point of each rod-like body, the descending liquid is dispersed in a thin film form. The gas is dispersed in a thin film on the surface, while the rising gas uniformly disperses a large number of voids in a three-dimensional manner, improving the contact efficiency between the two. Therefore, the occurrence of gas blow-by phenomenon is suppressed even in a low irrigation volume region, and the fluid contact efficiency does not decrease due to such a phenomenon. In the filling, the intersection angle of each rod-shaped body is particularly determined.
Set the angle between 50 and 75 degrees and set the porosity to 50%.
If the above settings are made, the fluid contact efficiency can be further improved, and if the surface of each rod-shaped body is formed into a finely uneven shape, the amount of fluid retained on the same surface will increase, further improving the fluid contact efficiency. I can do it. [Example] (1) Structure of the filling As shown in the attached drawing, the filling in this example is made up of a large number of round rods 11, 12 whose surfaces are formed into fine irregularities by adhering countless fine particles to their surfaces. Each round bar 11 is arranged substantially parallel in the lateral direction at a predetermined angle of inclination and at a predetermined interval to form a group, and similarly each round bar 12 also has a predetermined inclination angle and a predetermined interval.
They are arranged substantially parallel in the horizontal direction at predetermined intervals to form groups, and these groups are arranged alternately in the vertical direction. The round bars 11 and 12 intersect at symmetrical angles with respect to the axial direction (vertical direction) of the upright packed tower, and each intersection is bonded via an adhesive. Therefore,
Such a packing has a three-dimensional network-like internal structure and is provided with a large number of voids. In this example, eight types of packings having such a structure were prepared, each having a different intersection angle of the round rods, a different interval, and a diameter of the surface fine particles. These values for each filling are shown in Table 1. In addition, the outer diameter of each filling is 45
cm, height 7 cm. (2) Manufacturing method Ceramic raw materials such as mullite, alumina, silica, cordierite, and zirconia are used as raw materials for the round bars, and the same materials as for the round bars are used for the fine particles. As the organic adhesive in the adhesive, methyl cellulose, carboxymethyl cellulose, or other organic adhesive is used, and as the inorganic adhesive, one mainly composed of silica-alumina is used. Using these raw materials, the following steps are generally performed: round bar extrusion molding, drying, cutting into predetermined lengths,
Primary adhesion (round bars together), drying, integral adhesion (immersion), fine particle adhesion, drying, glaze application,
The filling is manufactured by appropriately combining drying and firing. For example, the first method is the process of ,,,,,,,,, the second method is the process of ,,,,,,, the third method is the process of ,,,,,,, the fourth A manufacturing method consisting of the following steps is adopted, and if it is desired to improve the corrosion resistance of the filler and reduce its water absorption, steps are added to each manufacturing method. In this example, a mullite round bar with a length of 250 mm was extruded in the process, dried at 105°C for 2 hours, cut into 8 cm lengths in the process, and silica-alumina, methyl cellulose, mullite Each round bar is joined at the intersection using an adhesive consisting of powder and water, dried at 105℃ for 2 hours in the process, immersed in a silica-alumina glaze for 10 seconds, and assembled in the process. Mullite particles are sprinkled on the body and adhered to the surface of the round bar, and excess particles are removed by vibration, and the process is heated to 80℃.
After drying at 105℃ for 1 hour, and 2 hours at 105℃, immersed in a silica-alumina glaze for 10 seconds, and drying at 105℃ for 2 hours,
In the process, it was baked at 1240°C for 3 hours. (3) Ammonia absorption test In an absorption tower with an inner diameter of about 45 cm, eight identical packings were stacked at 90° deviation in the circumferential direction, and air containing about 1000 ppm of NH ₃ was introduced from the bottom of the tower. A gas-liquid countercurrent contact operation was performed by flowing water down from the top in the amount shown in Table 1. The NH ₃ absorption efficiency (%) and pressure loss (mmAq/m) at this time are shown in the Example column of the same table. In addition,
The results of carrying out the gas-liquid countercurrent contact operation with 11/2" Raschig rings packed in the same absorption tower at the same height as the eight packing heights above are shown in the Comparative Example column of Table 1. show.

[Example 2]

Almost the same as the linear filling described above, except for the filling (linear filling) with an outer diameter of 30 cm and corresponding to Test No. 1 of Example 1, and a round bar extruded into a spiral shape to a height of 50 cm. A methanol distillation test was conducted by stacking 29 pieces of the former and 4 pieces of the latter separately in a distillation column with an inner diameter of approximately 30 cm using packing (helical packing) with different intersection angles, intervals, diameters, and particle sizes. . In the test, 1 ^m3 of a mixed solution of 10 mol% methanol and 90 mol% water was prepared in a reboiler, and this mixed solution was heated with steam to flow into the tower as a gas from the bottom of the tower, and the gas flowing out from the top of the tower was condensed in a condenser. This liquid was allowed to flow down from the top of the column. This distillation operation was continued for 6 hours, and the methanol concentration and pressure loss in the mixed liquid in reboiler A and condenser B were then measured. The results are shown in Table 2, and the Raschig ring (1
1/2") to the same height is shown as a comparative example.

[Table] Referring to Table 2, the linear type, which is an example product,
Both spiral-shaped packings have equivalent performance, and especially when compared with Raschig rings, they improve distillation performance by around 10 mol% in terms of methanol concentration and reduce pressure loss to 1/4.

[Brief explanation of the drawing]

The drawing is a perspective view of a linear packing according to an embodiment of the present invention.

Claims (1)

[Claims] 1. A fluid contacting packing packed in a fluid contacting packed tower, the packing combining a large number of rod-shaped bodies made of ceramics that are inclined with respect to the axial direction of the packed tower. 1. A packing for fluid contact, characterized in that it is an assembly having a large number of voids through which fluid flows between each rod-shaped body. 2. A patent claim in which the rod-like bodies that are connected to each other are inclined at symmetrical angles with respect to the axial direction of the packed tower, and the rod-like bodies that are adjacent to each other in a non-combined state are in a parallel positional relationship to each other. The fluid contact filler according to item 1. 3. The fluid contact filler according to claim 1 or 2, wherein the rod-shaped body has a finely uneven surface. 4. The fluid contact filler according to claim 1, 2, or 3, wherein the rod-like body has a linear or spiral shape. 5. The fluid contacting packing according to claim 1, 2, 3, or 4, wherein the porosity per volume of the aggregate is at least 50%.