SU48205A1 - Method of preparing tribrach for catalysts or porous catalysts - Google Patents

Description

It is known that most of the catalysts used in the technique are metals or their derivatives, oxides or salts. Often the effect of a metal catalyst is enhanced by the addition of an oxide of the same metal.

The action of the catalyst is a direct function of its surface. Therefore, a large surface of the catalyst is created by its deposition in one or another of the known methods on a loose, porous and the like lining, which, generally speaking, does not have any effect on chemical reactions; it will be, for example, asbestos, diatomaceous earth, pumice, etc. It is known that in the metal-ceramic way. solid pieces of metal can be obtained without having melted it, but with the powder of this metal; this is achieved by combining pressing with heat treatment of such powders.

From the author's certificate No. 48191 it is known that if such processing is brought only to a certain extent, to obtain the metal of the required porosity, then, starting from shavings, grids or wires, it is possible to obtain a porous piece of metal of any desired shape.

It is further known (from the same author's certificate) that, by additional processing, the edges of the resulting porous piece of metal can be created by impenetrability. This clip can also be made of another metal.

It is known that this kind of filtering element allows welding it with other parts and any kind of mechanical processing.

Based on the foregoing, the following method is proposed for the preparation of the catalyst, illustrated by the accompanying drawing, which depicts various embodiments of the filter elements.

The filter element obtained according to the method described in the author's certificate jNfe 48191 is used as a tribrach on which the catalyst is deposited or if it is made of the corresponding metal as the catalyst itself. Element .A is shaped as shown in FIG. 1, where the filter element A in its solid cage has the shape of two truncated cones shifted by bases, or two balls, parabolic and the like, shifted by large diameters (Fig. 5). The surfaces C thus formed serve to seal the element A between the caps E. when compressing. The catalyst acts by its porous part b

tfi filtering reactants through it.

The filter element A is shaped as shown in FIG. 2, in which the filter element L in its solid casing a has a welded ring B in the middle, which is compressed between the flanges of the covers E. The ring B can be located not centrally even 1, as shown in FIG. 3, in the same plane with the front of the filter or, as shown in FIG. 4, even a slab of protrusion from the front of the filter. The caps are provided with corresponding inlets for admitting reactive substances and openings on the opposite side for admitting reaction products.

The filter element A is shaped as shown in FIG. 4, where the filter element A has, at both ends, a similarity of the flanges C, to which the covers E. are attached.

FIG. 6 and 7 show the screw connection of cover E with catalyst A by means of cuts. By changing the direction of movement, the surface of the filter element can be cleaned of dirt.

Using such methods, the density of the connection of the filtering element of the catalyst with the instrument housing, and in the examples given, with lids / G of the reaction vessel is achieved.

The space in which substances that have not yet reacted are concentrated under a known pressure is separated from the space in which. there are reaction products so well that the reactants cannot bypass the porous part b of catalyst A, for example, they cannot pass between the porous catalyst and the tube into which it is laid.

Consequently, the proposed catalyst is distinguished from a simple porous plug by the presence of a solid metal clip, which facilitates and improves the fixing of the filter element in a clip, for example, a roof E (Fig. 1. 2, 4, 5, 6 and 7). It differs from a metal product in that the production of a filtering element is carried out in other conditions to a given degree of porosity, and not to a solid metal and not from powder, but from shavings, grids and wire.

It goes without saying that the porosity, pore size, and hence the surface of the catalyst can be predetermined in advance by the choice of starting material and production methods.

There are no restrictions on the choice of metal, since the filtering element can be made of any metal. If not a metal, but its oxides, is required as a catalyst, a porous metal filter element is first made of pure metal, and then oxide is produced inside the already prepared element, producing oxidation of the metal in one way or another.

Such a metal element has an advantage over the known ones in that the oxide is supported on a metal base, and the catalyst as a result is stronger than the known, more constructive and more compact.

In order to obtain a catalyst in the form of a mixture of metal with its oxide, the oxidized element should be alternately slightly reduced and oxidized by any of the known methods, which leads to some coarsening of the oxide grain and exposure of the metal surface of the porous lining.

Equally, the filtering element can be made from a mixture of two or more metal components, the grains of which retain part of their individual surface and in the finished product. Moreover, the filtering element can be obtained from a mixture of grains of several metals and several oxides in the same way, and the grains of metal will give a spatial repack, a durable metal frame containing oxide grains in the form of the contents of filtering capillaries in the form of free grains and soldered to the metal frame. In addition, it is possible to pick up an indium metal and make an ideal lining from it, filling it in the process of its manufacture with a catalyst powder.

The advantages of the described catalyst are the following: 1) large relative mechanical strength, 2) constructiveness, 3) arbitrary size; pores and porosity, 4) ease of replacement, | 5) the ability to purge on the go, 6); perfect fixing density.

The field of application is - wherever a catalyst is required and where it is possible to select a metal as a lining material that does not oppose the flow of a given catalyst.

The subject matter of the invention.

Use as tribrach dt: catalysts or porous catalysts i-portors of porous metal filters prepared according to the method described in author's certificate No. 48191.

FIG. 1. FIG. S G // l of FIG. 4. Fig. C. / ШШ li | .U ill, v