Electrolyser for production of catholyte

Abstract

Electrolyzer for catholyte production comprises an inner hollow cylindrical anode, an outer cylindrical cathode, and a diaphragm interposed between them. The length of the working part of the anode is at most 2 to 6 times the outer diameter of the anode. The inner hollow anode is made of one or two sections, the sections being connected to each other by a flow dielectric cylindrical sleeve having a diameter not larger than the outer diameter of the anode. The inner hollow anode has openings for introduction of water into inner cavity of the anode and openings for discharge of water at opposite ends of diameters of the anode lid. The electrolyzer for catholyte production operates in a horizontal position because outlet openings of the anode lid are located at the ends of the diameter of the anode lid, close to the outlet openings of the electrolyzer lid facing vertically upwards.

Claims

1. An electrolyzer for catholyte production comprising an inner hollow cylindrical anode, an outer cylindrical cathode, and a diaphragm mounted between the anode and the cathode, wherein a length of a working part of the anode is at most 2-6 times greater than an inner diameter of the anode.

2. The electrolyzer for catholyte production according to claim 1, wherein the inner hollow anode is made of one or two sections.

3. The electrolyzer for catholyte production, according to claim 2, wherein the inner hollow of the anode comprises an opening for introduction of water into the inner hollow of the anode and an opening for discharge of water is arranged at opposite ends of the diameters of anode covers.

4. The electrolyzer for catholyte production according to claim 2, wherein the sections of the inner hollow of the anode are connected to each other by a flow-through, dielectric, cylindrical sleeve having an outer diameter not larger than the outer diameter of the anode.

5. The electrolyzer for catholyte production according to claim 1, wherein the electrolyzer is configured to operate in a horizontal position because the outlet openings of the anode lid are arranged at the ends of the diameter of the anode lid, which are close to exit openings of the electrolyzer lid and facing vertically upwards.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0017] The technical nature and operation of the device are explained in the drawings, where:

[0018] FIG. 1 is a one-section anode closed at one end by a lid having an opening for water to enter the inner hollow of the anode and at the other end closed by a lid having an opening for water leaving the inner hollow of the anode;

[0019] FIG. 2 shows a two-section anode, wherein each anode section has a lid at one end with an opening at the end of the diameter of the lid; at the other end of the section, there is a thread for connection to the sleeve and a conical plane for hydraulic sealing of the connection between the section and the sleeve, wherein the two sections of the anode are connected in such a way that the opening for entering the inner hollow of the anode and the opening for leaving it are located at opposite ends of the diameters;

[0020] FIG. 3 shows the electrolyzer in a horizontal position.

DETAILED DESCRIPTION OF THE INVENTION

[0021] An embodiment of the present invention is exemplified in the results table for various types of electrolyzers for the production of catholyte prepared in accordance with the present application. The operating results of the electrolyzer for the production of catholyte confirm the productivity achieved in terms of conversion to NaOH (in the table electrolyzer CG-3400ANE, two-compartment), achieving the declared catholyte content in the total catholyte and anolyte volume (columns 6 and 7 in the table), applying in the electrolyzer design a ratio between the length of the operating part of the anode chamber and the diameter of the anode between 2.0 and 5.5 (column 4). The construction of the electrolyzer for the production of catholyte is shown in FIG. 3.

TABLE-US-00001 Length of the The ratio The proportion of working part between catholyte in the total Anode of the anode length NaOH volume of catholyte and Name of the diameter chamber in and productivity anolyte electrolyzer mm mm diameter g/hour 1000 ppm 6000 ppm 1 2 3 4 5 6 7 CG-40ANE 38 98 2.6 17 94.4 75.0 CG-600ANE 86 450 5.2 230 93.8 71.7 CG-1700ANE 219 450 2.1 500 94.0 72.4 CG-3400ANE 219 940 4.3 1250 94.6 74.8 (with two sections)

[0022] The disclosed cylindrical diaphragm flow electrolyzer comprises a cylindrical anode 1, a cathode 2, and a diaphragm 3. The electrolyzer has a lid 4 with openings 5 and 6 for the entry of the electrolyte and a lid 7 with openings 8 and 9 for the exit of the electrolyte.

[0023] The one-section anode (FIG. 1) has a lid 10 for opening water with an opening 11, where the opening 11 is located at the end of the lid diameter, and a similar opening 13 with a lid 12 for the water outlet, where the opening 13 is located at the opposite end of the lid diameter. The anode has a terminal marked (+) in the figure.

[0024] The two-section anode (FIG. 2) consists of two identical sections, 14 and 15; each section has a lid with an opening at one end, and at the other end of the section, there is a thread 16 for connecting the sections by means of a sleeve 18 and a conical plane 17 for hydraulically sealing the connection between the sections and the sleeve, wherein the sections are connected in such a way that the openings 11 and 13 of the anode cover are arranged at opposite ends of the diameter of the anode covers. Each anode section has terminals marked (+) in the figure. The connecting sleeve 18 is made of electrically insulating material.

[0025] The interior of the assembled electrolyzer (FIG. 3) has a cathode chamber 19 between the cathode 2 and the diaphragm 3 from the opening 6 to the opening 8, and the interior of the electrolyzer has an anode chamber 20 between the anode 1 and the diaphragm 3 from the opening 5 to the opening 9. The part of the anode chamber 20, which is arranged against the cathode 2, is called the operating part of the anode chamber. The part of the anode 1 which is placed against the cathode 2 is called the working part of the anode.

[0026] The electrolyzer for the production of catholyte described above works as follows: freshwater is introduced into the inner hollow of the anode 1 through an opening 11 in the anode lid 10, intended for the injection of water, the water cools the anode 1, the water is discharged from the inner hollow of the anode through the opening 13 of the lid 12 and directed to the opening 6 of the electrolyzer lid 4, where the water enters the cathode chamber 19 wherein the water is electrochemically converted to a catholyte, and the catholyte is discharged through the opening 8 in the lid 7. In order to change the properties of the catholyte and the accompanying anolyte, NaCl, NaHCO3, and the like are taken into the cathode chamber. Simultaneously with the introduction of freshwater into the inner hollow of the anode 1, an electrolyte is introduced into the anode chamber 20 through the opening 5 of the lid 4 (depending on the production conditions, it may be NaCl, NaHCO3) in the anode chamber, the electrolyte is converted to an anolyte, and the anolyte is led out of the electrolyzer through the opening 9 in the lid 7. After the anode chamber and the cathode chamber have been filled, a constant voltage is applied to the anode and the cathode via the (+) and (−) terminals.