SU1212526A1 - Apparatus for solving - Google Patents

Description

2. An apparatus in accordance with claim 1, wherein the ratio of the volume of the expansion vessel to the volume of the column is 1-6.

- - .... „., .. The invention relates to hydraulic mixing mass transfer devices and can be used in the chemical and other industries in order to intensify heterogeneous processes, for example. dissolving and leaching processes, in particular when dissolving sodium chloride.

The aim of the invention is to increase the yield of the target product and. the ability to handle coarse-grained polydisperse substances.

FIG. 1 is a schematic representation of the apparatus, the general view, in FIG. 2 - dependence of the degree of dissolution (or product yield) on the ratio (. The dissolution apparatus consists of a vertical column 1 (pulsation part) with horizontal plates 2 made in the form of coaxial rings and guides, blades, inclined between the rings, pulsator 3, pump 4

to create a pulsation mode I. ...

in the mixer.

The column 1 is provided with an expansion tank 6 connected to its lower base 5 and having an increasing area H of section section S with a nozzle 7 arranged in its lower part directed upwards to transfer the circulating suspension and fresh water. In the lower part of the tank 6 there is a fitting 8 for periodic removal of insoluble, and in the upper part there is a fitting 9 for removing the suspension and the salt supply fitting 10. To circulate the suspension and create a hydrofining mode, the container 6 supplies a circulating pipe {pipe 11 connecting the nozzle 7 with the upper part of the container. Water

3, The apparatus according to Claim 1, which is based on the fact that the expansion vessel is anabrically enclosed by external circulation pipelines connecting the upper part of the vessel to the junction box.

to dissolve the salt and obtain a saturated solution, it is fed to the nozzle 7 or to the circulation pipe 11 through the flow meter 12;

The column 1 is connected to the tank 6 by means of an adapter 13.

The area of section 5 is related to height H by the following relationship:

/ S / h 0.4-2.1. The ratio of the diameter of the upper base of the expansion tank A to the diameter of the column AVC is 2-15. The ratio of the volume of the expansion tank

6 and the volume of the column is 1-6. The device works as follows.

Salt from the salt storage is fed through nozzle 10 into the expansion tank.

6. There, through the flow meter 12 and the nozzle 7, water is supplied in such a ratio so as to obtain a solution close to saturation after the dissolution of all the incoming salt. In the broad

The containers 6 dissolve the most coarse Hbie crystals due to the intensive mass transfer during the spurting mode of mixing. Under the flowing mode is understood the mode of mixing of the solid phase, which is in a suspended state, by the jet of the liquid phase entering from the bottom into a tank with a variable cross section. In this case, the jet entering the layer of suspended particles

with great speed, captures them and raises up the axis of the layer. The speed of a jet of liquid under the action of the layer's resistance and with increasing its cross section decreases in height, which

leads to the dropping of particles to the machines of the vessel 6, near which they, together with the liquid, slowly descend to the entrance of the jet, creating an ejection

FFECT, and it is the largest at the entrance j

by which the particles fall into the stream again. Thus, there is a stable, intensive circulation of particles in the apparatus and the necessary contact time of the phases, which in turn ensures an intensive mass exchange. This mode, which leads to the maximum yield of the target product, is achieved in a tank with a variable cross-sectional height, in which the cross-sectional area S and height I are related by the ratio

/ H 0.4 - 2.1, With a ratio less than 0.4, the cross section practically does not change with height, and the apparatus is close to the column one. The fluid velocity in such an apparatus is almost constant in height, and there is no recirculation of the solid and liquid phases in it, therefore the contact time of the phases is very short and it is not possible to obtain a solution close to

to saturated. With a ratio of 5 crystals to the input of the pulsation shem, 2.1, i.e. with a sharp increase in part of the mixer should be evenly

The sections with height also lack the circulation of the solid phase due to the fact that the particles do not move towards the inlet of the jet but are retained on the walls of the apparatus and dissolve very slowly.

Experimental studies have shown that the degree of conversion and / or output of the target product depends on the amount of phase flow recirculating inside the apparatus, and therefore on the ratio in an extreme way. This dependence is shown in FIG. 2, from which it can be seen that the maximum value of the degree of dissolution of the salt X (or the yield of the product) is achieved at values of 0.4b Е2.1

In the expansion tank 6, coarse salt particles circulate to dissolve to a certain size, usually 200-500 µm, and then the suspension with fine crystals of a given size, which ensures the normal operation of the pulsation part without breakdowns, flows evenly into the column 1 (the pulsation part of the dissolution), where there is a complete dissolution of the remaining particles in the pulsating mode. It is necessary; so that crystals could not get into the pulsation part of the apparatus, and, at the same time, an orbital movement of the suspension in it

should be sufficient to work effectively. Therefore, the ratio of the diameter of the upper base of the expansion tank Ar to the diameter

RU (pulsation part) of the column f

must lie within the limits of Ar. | A

 2-15. At a ratio less

2, speed in pulsioin mix the slider is not sufficient for its effect

(MYSTERY operation, and with a greater 15, the suspension rate is so large that it is possible that undissolved crystals may get into the final solution. Such a large interval of variation of this

The ratios are due to the large intensity range of the difference in the densities of the processed materials (solutes and solvents (fj Рж which, basically, determines ot.

carriage speed

phases and may vary from 0 to 8,103 kg / m.

Thus, in order to prevent breakthroughs, they did not have time to dissolve

particles of one given size are supplied, which, when polydisperse systems dissolve, which was the crystalline salt, from the mines, is achieved by combining the column (pulsation part of the apparatus) with an expansion tank at a ratio of -. shhenii - 2 - 15, while the volume of the expansion tank

and the columns, (pulsation part) Vn, are in the ratio Vp) V, which is due to the necessary ratio of the residence time of the suspension in the expansion vessel and in the pulsation part. In the described apparatus, when connecting the column 1 (pulsation part) and the expansion vessel 6, particles of one strictly specified size enter the input of the pulsation part, which excludes the possibility of large particles that did not have time to dissolve into the solution, and a sufficiently concentrated solution, which allows significantly reduce the height of the whole apparatus when obtaining solutions close to saturation. At a ratio VP | less than 1, the residence time in the expansion tank is small and large crystals can get to the entrance of the pulsation mixer, which leads to their penetration into the final solution.

With a ratio greater than 6, the use of the proposed device for preparing graded solutions in continuous mode is almost impossible due to the slow kinetics of salt dissolution in solutions.

in composition close to saturation and, as a result, the necessity of using devices of extremely large size to provide the required for complete dissolution of all

salt time of her stay vapparate.

Editor P. Cossey

Compiled by N. Fedorov.

Techred. O.Nice Corrector G. Reshetnik

Order 671/10 Circulation 578Subscription

VSHOSHI USSR State Committee

for inventions and discoveries 113035 Moscow, Zh-35, Raushsk nab., D. 4/5

Feital PSh1 Patent, Uzhgorod, st. Project, 4

Claims (3)

1. Dissolution apparatus, containing a column with plates and fittings connected to a pump and a pulsator, characterized in that, in order to increase the yield of the target product and the possibility of processing coarse-grained polydisperse composition, the column is equipped with an expansion tank connected to its lower base, having a cross-sectional area $ increasing in height H, with a nozzle located in its lower part directed upward, the ratio a / n being 0.4-2.1, and the ratio of the diameter of the upper base of the container to the diameter of the column It wishes to set up 2-15. SU „„ 1212526 2. The apparatus by π. 1, characterized in that the ratio of the volume of the expansion tank to the volume of the column is 1-6. 3. The apparatus according to claim ^, characterized in that the expansion tank is provided with an external * circulation pipelines connecting the nozzle to the top of the tank.