SU929147A1 - Electric dializer for cleaning solution - Google Patents

Description

(54) ELECTRODIALIZER FOR CLEANING SOLUTION

one

The invention relates to the electrochemical treatment of liquids, in particular to the design of electrodialyzers.

An electrodialysis apparatus is known, consisting of a brine drainage tank of concentration chambers, on which a package of vertically alternating cation-exchange and anion-exchange membranes is located, and of spacers. The membranes are divided by frameworks with bridges attached to the sides, forming concentration and desalination chambers. Lintels are trapezoidal, with a large base attached to the side walls. The bottom side of the gasket frames of the concentrating chambers is made with a greater height than the bottom side of the gasket frames of the desalting chambers. In the lower side of the gasket frames of the concentrating chambers there are slit grooves extending beyond the edges of the membranes and gaskets of the desalting chambers 1.

The disadvantage of this electrodialyzer is the complexity of the design, which leads to a complex solution supply scheme, which does not allow sufficient solution turbulization.

Also known is an electrodialyzer for cleaning the solution, which includes two end frames with electrodes, between which a cation-exchange and anion-exchange membranes are placed, a turbulizer made in the form of a grid, a spout for introducing the solution to be purified and a spout for discharging the purified solution.

The membranes are separated by frames forming the chambers. Each frame is provided with trailing liners (along the edges), separator liners for supporting the membranes and devices for distributing flows located in the seal area of each end of the frame. The entire set of membranes and frames is clamped between

15 extreme frames in which electrodes are fixed 2.

The disadvantage of this design is low productivity due to the presence of a large number of stagnant zones.

20

The purpose of the invention is to increase productivity by increasing the effective area of the membranes.

Claims (2)

This goal is achieved by the fact that in an electrodialyzer for cleaning a solution. including two end frames with electrodes, between which a cation-exchange and anion-exchange membranes are placed, a turbulizer, an inlet pipe for introducing the solution to be purified and an outlet pipe for the purified solution, the turbulizer is made in the form of a cylinder, on the external surface of which there is a thread, and the inlet pipe for the purified solution is installed in the lower part of the turbulizer , and the outlet pipe - at the top. The arrangement between the end frames of a cylindrical turbulizer, on the outer surface of which is threaded, makes it possible to significantly turbulize the flows and, consequently, reduce the concentration polarization and the number of stagnant zones for solutions along the surface of the membranes, which increases the coefficient of useful use of the membranes to 950/0 . The drawing shows the scheme of electrodialyzer. The electrodialysis apparatus consists of two end frames 1 equipped with a device for fixing the electrodes of the input 2 and the output 3 of the concentrated solution. Between the end frames there is a turbulizer 4 of cylindrical shape, on the outer surface of which a thread 5 is made, and inside the branch pipe for insertion 6 and output 7 of the solution being cleaned. Cationic and anion-exchange membranes 8 are located between the end frames 1 and the turbulizer 4 of cylindrical shape. In this case, the streams treated with 1x (demineralized and concentrated) solutions remain separate. In the end frames 1, the electrodes are buried so that when the ion-exchange membranes 8 are fixed, chambers 9: And 10 of concentration are formed. A turbulizer 4 of cylindrical shape and ion-exchange membranes 8 create a cleaning chamber along the threaded channels. Electrodialyzer works as follows. Concentrated solution is fed through inlet 2 into the concentration chambers 9 and 10. and is outputted via terminal 3. At the same time, a cleaned solution is fed into the turbulizer 4 of a cylindrical shape through the nozzle b, which in the lower part of the turbulizer of a cylindrical shape is outputted to the thread. Climbing along the threads and in contact with the ion-exchange membranes, the solution is cleaned and leaves the upper part of the cylindrical element through pipe 7. Using the proposed electrodialyzer, it is possible to increase the efficiency of the membranes up to 950/0 by increasing the flow turbulence; simplify the process of assembling the electrodialyzer, eliminate the displacement of the purified and concentrated solutions by eliminating in the design of alternating cationic and anion-exchange membranes, gaskets between the membranes and frames. Claims of the Invention Electrodialyzer for solution cleaning, including two end frames with electrodes, between which a cation exchange and anion exchange membranes are placed, a turbulator, an inlet pipe for injecting the solution and an outlet pipe for the purified solution, in order to increase the efficiency of the electrodialyzer by increasing the effective area of the membrane , the turbulizer is made in the form of a cylinder, on the external surface of which a thread is made, and the nozzle for entering the solution to be purified is installed in the lower part the turbulizer, and the outlet connection is at the top. Sources of information taken into account during the examination 1. USSR author's certificate No. 587960, cl. On 01 D 13/02, 1977. 2. Technological processes using membranes. Sat by ed. F. Lacy and S. Löba.M., Mir, 1976, p. 100-101.