Electrolytic bath for ionic membrane caustic soda

Abstract

The utility model relates to the technical field of electrolytic baths, and discloses an electrolytic bath for ionic membrane caustic soda, which comprises an electrolytic bath, an anode, a cathode, an ionic membrane, a first exhaust pipe and a second exhaust pipe, the anode, the cathode and the ionic membrane are arranged in the electrolytic bath, the first exhaust pipe and the second exhaust pipe are communicated with the top of the electrolytic bath, and the top of one side of the electrolytic bath is communicated with a first liquid inlet pipe. According to the electrolytic bath for ionic membrane caustic soda, a refined saturated sodium chloride solution can be conveyed into the electrolytic bath through the first liquid inlet pipe, and the liquid pressure acting on the bottom of the electrolytic bath is gradually increased along with continuous conveying of the solution, so that the generated liquid pressure can push a valve element to move and open the valve element at the same time; and at the moment, the electrolyzed solution at the anode can be conveyed into the first liquid discharging pipe through the liquid discharging hole, the refined saturated sodium chloride solution is conveyed in an upper-inlet and lower-outlet mode, the generated by-product sodium chlorate can be discharged in time, and therefore the influence of the sodium chlorate on the electrolysis process is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrolytic cell, specifically discloses an electrolytic cell for ion exchange membrane caustic soda. BACKGROUND

[0002] Ion exchange membrane caustic soda is caustic soda (sodium hydroxide) made by electrolyzing brine by ion exchange membrane method, and its main principle is that the cation exchange membrane used has special selective permeability, only allowing cations to pass through and preventing anions and gases from passing through, that is, only H+, Na+ can pass through, but Cl-, OH- and two products H2 and Cl2 cannot pass through, thus preventing the mixing of anode product Cl2 and cathode product H2 that may cause explosion, and avoiding the reaction of CL2 and another cathode product NaOH to generate sodium hypochlorite to affect the purity of caustic soda.

[0003] The electrolytic cell for ion exchange membrane caustic soda produces by-product sodium chlorate during the electrolysis of refined saturated sodium chloride solution at the anode, and since sodium chlorate is an unstable substance, it can easily cause abnormal reactions in the electrolytic cell, leading to instability and even collapse of the electrolytic cell. In addition, sodium chlorate also increases the resistance in the electrolytic cell, affecting the efficiency of the electrolysis process, so it is necessary to discharge sodium chlorate from the electrolytic cell in time. The existing electrolytic cell uses a downward and upward method to transport refined saturated sodium chloride solution, which causes the by-product sodium chlorate to be unable to be discharged in time, thereby affecting the electrolysis process in the electrolytic cell. SUMMARY

[0004] In view of the above defects or deficiencies in the prior art, the present application aims to provide an electrolytic tank for ion exchange membrane caustic soda, comprising an electrolytic tank, an anode, a cathode and an ion exchange membrane installed inside the electrolytic tank, a first exhaust pipe and a second exhaust pipe communicated at the top of the electrolytic tank, a first liquid inlet pipe communicated at the top of one side of the electrolytic tank, and a second liquid inlet pipe communicated at the top of the other side of the electrolytic tank, a first connecting pipe communicated at one side of the bottom of the electrolytic tank, and a second connecting pipe communicated at the other side of the bottom of the electrolytic tank, a first liquid outlet pipe communicated outside the first connecting pipe, a second liquid outlet pipe communicated outside the second connecting pipe, a liquid discharge hole opened inside the bottom of the electrolytic tank and communicated with the first connecting pipe and the second connecting pipe, a sealing plate fixedly installed inside the bottom end of the first connecting pipe and the second connecting pipe through bolts, a valve rod movably sleeved inside the sealing plate, a valve core fixedly sleeved outside the top end of the valve rod extending into the inside of the first connecting pipe, a driving mechanism fixedly installed at the bottom of the sealing plate, a diaphragm fixedly installed outside the valve rod and movably sleeved, a gasket movably sleeved outside the diaphragm, and a nut threadedly sleeved outside the gasket, an avoiding groove penetrating through the inside of the bottom end of the valve rod, and a spring sleeved outside the middle part of the valve rod.

[0005] Preferably, a first liquid level sensor and a second liquid level sensor are fixedly sleeved inside the top of the electrolytic tank and distributed on both sides of the ion exchange membrane.

[0006] Preferably, a one-way valve is installed outside the first liquid inlet pipe and the second liquid inlet pipe.

[0007] Preferably, the driving mechanism comprises an electric telescopic rod fixedly installed on the sealing plate, a moving plate fixedly sleeved outside the top end of the electric telescopic rod, and a push rod provided outside the moving plate and matched with the avoiding groove.

[0008] The utility model discloses the following effects:

[0009] 1. The electrolytic tank for ion exchange membrane caustic soda can transport refined saturated sodium chloride solution into the inside of the electrolytic tank through the first liquid inlet pipe, and the liquid pressure acting on the bottom of the electrolytic tank gradually increases with the continuous transportation of the solution, so that the generated liquid pressure can move the valve core and open the valve core at the same time, at which time the electrolyzed solution at the anode can be transported into the inside of the first liquid outlet pipe through the liquid discharge hole. This structure adopts the way of going up and going down to transport the refined saturated sodium chloride solution, so that the by-product sodium chlorate can be discharged in time, thereby reducing the influence of sodium chlorate on the electrolysis process.

[0010] 2. The electrolytic tank for ion exchange membrane caustic soda, through the first liquid level sensor, the solution at the anode is detected, and the driving of the electric telescopic rod is controlled, and then the electric telescopic rod is driven when the liquid level reaches the set value, at this time, the valve stem is driven to move down while the valve core is completely opened, so that the liquid discharge capacity of the electrolytic tank is increased, and the solution cannot cause the blockage of the first exhaust pipe. BRIEF DESCRIPTION OF DRAWINGS

[0011] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, when read in conjunction with the accompanying drawings:

[0012] Figure 1 It is a schematic view of the structure of the utility model;

[0013] Figure 2 It is Figure 1 It is an enlarged schematic view of the structure of A in the middle;

[0014] Figure 3 It is a partial schematic view of the structure of the utility model.

[0015] In the drawing: 1, electrolytic tank; 2, anode; 3, cathode; 4, ion exchange membrane; 5, first exhaust pipe; 6, second exhaust pipe; 7, first liquid inlet pipe; 8, second liquid inlet pipe; 9, first connecting pipe; 10, second connecting pipe; 11, first liquid outlet pipe; 12, second liquid outlet pipe; 13, liquid discharge hole; 14, bolt; 15, sealing plate; 16, valve stem; 17, valve core; 18, driving mechanism; 181, electric telescopic rod; 182, moving plate; 183, push rod; 19, diaphragm; 20, gasket; 21, nut; 22, position avoiding groove; 23, spring; 24, first liquid level sensor; 25, second liquid level sensor; 26, check valve. DETAILED DESCRIPTION

[0016] The application will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings.

[0017] The drawings in the embodiments of the utility model: different kinds of section lines in the drawing are not marked according to the national standard, and the material of the element is not required, which is to distinguish the section view of the element in the drawing.

[0018] Please refer to Figures 1-3The utility model provides an electrolytic tank for ion exchange membrane caustic soda, including electrolytic tank 1, install anode 2, cathode 3 and ion exchange membrane 4 in electrolytic tank 1 inside and the first exhaust pipe 5 and the second exhaust pipe 6 of intercommunication in electrolytic tank 1 top, the top of electrolytic tank 1 one side intercommunication has first liquid inlet pipe 7, and the top of electrolytic tank 1 other side intercommunication has second liquid inlet pipe 8, the bottom of electrolytic tank 1 one side intercommunication has first connecting pipe 9, and the bottom of electrolytic tank 1 other side intercommunication has second connecting pipe 10, the outside of first connecting pipe 9 intercommunication has first liquid outlet pipe 11, the outside of second connecting pipe 10 intercommunication has second liquid outlet pipe 12, the inside of electrolytic tank 1 bottom is provided with the liquid outlet hole 13 of intercommunication with first connecting pipe 9 and second connecting pipe 10, and the inside of first connecting pipe 9 and second connecting pipe 10 bottom end is fixedly installed with sealing plate 15 through bolt 14, the inside of sealing plate 15 is movably sleeved with valve rod 16, and the top end outside of valve rod 16 extension to the inside of first connecting pipe 9 is fixedly sleeved with valve core 17 located below liquid outlet hole 13, and the bottom of sealing plate 15 is fixedly installed with drive mechanism 18, and the diaphragm 19 of movably sleeved in the outside of valve rod 16 is fixedly installed between bolt 14 and sealing plate 15, through diaphragm 19 can shield protection spring 23, avoid its rust, the gasket 20 of movably sleeved in the outside of valve rod 16 is located below the nut 21 of the outside screw joint of valve rod 16, the inside of valve rod 16 bottom end is penetrated with the position-avoiding groove 22, the spring 23 of sleeveing is installed in the outside of valve rod 16 middle part, through the elastic force of spring 23 can promote valve rod 16 to move up and drive valve core 17 to shield sealing liquid outlet hole 13, to ensure that a certain capacity of liquid can be pre-stored in the inside of electrolytic tank 1, and then electrolytic reaction can be carried out in the inside of electrolytic tank 1 by energizing anode 2 and cathode 3.

[0019] Wherein, the first liquid level sensor 24 and the second liquid level sensor 25 of distribution are fixedly sleeved in the inside of electrolytic tank 1 top and are located on both sides of ion exchange membrane 4, the solution at the anode can be detected by the first liquid level sensor 24 while the electric telescopic rod 181 below the first connecting pipe 9 can be controlled, and the solution at the cathode can be detected by the second liquid level sensor 25 while the electric telescopic rod 181 below the second connecting pipe 10 can be controlled, so that the solution delivered into the electrolytic tank 1 will not immerse the first exhaust pipe 5 and the second exhaust pipe 6 to cause blockage, and the chlorine and hydrogen generated by the electrolytic reaction can be discharged outward through the first exhaust pipe 5 and the second exhaust pipe 6.

[0020] The outer side of the first liquid inlet pipe 7 and the second liquid inlet pipe 8 is provided with a one-way valve 26, so that the refined saturated sodium chloride solution and the NaOH-containing aqueous solution transported from the first liquid inlet pipe 7 and the second liquid inlet pipe 8 to the inside of the electrolytic cell 1 can flow in one direction, and the chlorine gas and hydrogen gas generated by the electrolysis reaction cannot flow into the inside of the first liquid inlet pipe 7 and the second liquid inlet pipe 8, so that the chlorine gas and hydrogen gas can be discharged to the outside of the electrolytic cell 1 through the first exhaust pipe 5 and the second exhaust pipe 6 in time.

[0021] The driving mechanism 18 includes an electric telescopic rod 181 fixedly installed on the sealing plate 15, and a moving plate 182 is fixedly sleeved on the outer side of the top end of the electric telescopic rod 181. The outer side of the moving plate 182 is provided with a push rod 183 matched with the avoiding groove 22, so that the push rod 183 can be avoided by the avoiding groove 22, so that the push rod 183 cannot hinder the movement of the valve rod 16. The valve core 17 can be pushed downward and opened under the action of the liquid pressure. The push rod 183 can push the valve rod 16 and drive the valve core 17 to move downward at the same time under the drive of the electric telescopic rod 181, so that the valve core 17 is completely opened. At this time, the solution remaining in the electrolytic cell 1 can be discharged through the first liquid discharge pipe 11 and the second liquid discharge pipe 12 through the liquid discharge hole 13 and the second connecting pipe 10.

[0022] When the electrolytic cell works, the refined saturated sodium chloride solution is transported to the anode in the electrolytic cell 1 through the first liquid inlet pipe 7, and the NaOH-containing aqueous solution is transported to the cathode in the electrolytic cell 1 through the second liquid inlet pipe 8. The anode 2 and the cathode 3 are electrified. At this time, the electrolysis reaction is carried out in the electrolytic cell 1. The chlorine gas generated at the anode is discharged to the outside through the first exhaust pipe 5, and the hydrogen gas generated at the cathode is discharged to the outside through the second exhaust pipe 6. As the capacity of the solution in the electrolytic cell 1 increases, the pressure of the liquid acting on the bottom inside of the electrolytic cell 1 gradually increases. When the liquid pressure acting on the valve core 17 is greater than the elastic force of the spring 23 acting on the valve core 17, the liquid can push the valve core 17 to move downward along the axial direction of the valve rod 16 at the same time, and the valve core 17 in the first connecting pipe 9 or the second connecting pipe 10 is opened. The liquid in the electrolytic cell 1 can be discharged to the inside of the first connecting pipe 9 or the second connecting pipe 10 through the liquid discharge hole 13. When the first liquid level sensor 24 detects that the liquid level reaches the set value, the electric telescopic rod 181 below the first connecting pipe 9 can be controlled to start. The valve rod 16 can be pushed by the push rod 183 driven by the electric telescopic rod 181. At this time, the valve core 17 in the first connecting pipe 9 is completely opened, so as to increase the liquid flow in the first connecting pipe 9. The contents not described in detail in the description belong to the existing technology known to those skilled in the art.

[0023] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0024] The above description is merely the preferred embodiments of the present application and the explanation of the technical principles applied. It should be understood by those skilled in the art that the scope of the utility model involved in the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by the combinations of the above technical features or equivalent features without departing from the concept of the utility model. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) with similar functions.

Claims

1. An electrolyzer for ion-exchange membrane caustic soda, comprising an electrolyzer (1), an anode (2) and a cathode (3) and an ion-exchange membrane (4) installed inside the electrolyzer (1), and a first exhaust pipe (5) and a second exhaust pipe (6) communicated at the top of the electrolyzer (1), characterized in that: The top of one side of the electrolytic cell (1) is communicated with a first liquid inlet pipe (7), and the top of the other side of the electrolytic cell (1) is communicated with a second liquid inlet pipe (8), one side of the bottom of the electrolytic cell (1) is communicated with a first connecting pipe (9), and the other side of the bottom of the electrolytic cell (1) is communicated with a second connecting pipe (10), the outer side of the first connecting pipe (9) is communicated with a first liquid outlet pipe (11), the outer side of the second connecting pipe (10) is communicated with a second liquid outlet pipe (12), the inside of the bottom of the electrolytic cell (1) is provided with a liquid outlet hole (13) communicated with the first connecting pipe (9) and the second connecting pipe (10), the inside of the bottom end of the first connecting pipe (9) and the second connecting pipe (10) is fixedly installed with a sealing plate (15) through a bolt (14), the inside of the sealing plate (15) movably sleeves a valve rod (16), the top end of the valve rod (16) extending to the inner side of the first connecting pipe (9) is fixedly sleeved with a valve core (17) below the liquid outlet hole (13), the bottom of the sealing plate (15) is fixedly installed with a driving mechanism (18), the bolt (14) and the sealing plate (15) are fixedly installed with a diaphragm (19) movably sleeved on the outer side of the valve rod (16), the outer side of the valve rod (16) movably sleeves a gasket (20) inside the diaphragm (19), and the outer side of the valve rod (16) is threaded with a nut (21) below the gasket (20), the inside of the bottom end of the valve rod (16) penetrates an avoiding slot (22), and the outer side of the middle of the valve rod (16) is sleeved with a spring (23).

2. An electrolyzer for ion-exchange membrane caustic soda according to claim 1, characterized in that: The inside of the top of the electrolytic cell (1) is fixedly sleeved with a first liquid level sensor (24) and a second liquid level sensor (25) distributed on both sides of the ion membrane (4).

3. An electrolyzer for ion-exchange membrane caustic soda as claimed in claim 1, wherein: The outer side of the first liquid inlet pipe (7) and the second liquid inlet pipe (8) is installed with a check valve (26).

4. An electrolyzer for ion-exchange membrane caustic soda as claimed in claim 1, wherein: The driving mechanism (18) comprises an electric telescopic rod (181) fixedly installed on the sealing plate (15), the outer side of the top end of the electric telescopic rod (181) is fixedly sleeved with a moving plate (182), and the outer side of the moving plate (182) is provided with a push rod (183) matched with the avoiding slot (22).

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