Chlorate decomposing device capable of performing pretreatment
By fully mixing and heating hydrochloric acid with brine in the pretreatment unit of the chlorate decomposition device, the reduction of current efficiency and equipment corrosion caused by the enrichment of chlorate in caustic soda production is solved, and more efficient decomposition and safety are achieved production process.
Patent Information
- Application Number
- CN202420702607.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-07
AI Technical Summary
In the production of caustic soda with existing ion membrane method, the enrichment of chlorate in brine leads to reduced current efficiency of the electrolytic cell, corrosion of the equipment, and the risk of explosion may be caused when decomposed under high temperature and high acidity conditions.
A chlorate decomposition device including a pretreatment unit, a decomposition unit and a pipeline unit is designed. By fully mixing hydrochloric acid and brine in the pretreatment unit and heating it to above 85 degrees before decomposition, the decomposition efficiency of chlorate is improved. , avoid damage to the equipment by high temperature and high acidity.
It improves the decomposition efficiency of chlorate, reduces the risk of equipment damage, avoids the generation of chlorine dioxide and the threat of explosion, and ensures the safe and stable production of chemical systems.
Smart Images
Figure CN222205478U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chlor-alkali production, in particular to a chlorate decomposition device capable of performing pretreatment. Background Art
[0002] The main principle of ion membrane caustic soda production is to make the chloride ions in the brine lose electrons at the anode to generate chlorine through electrolysis; hydrogen ions gain electrons at the cathode to generate hydrogen. The ion membrane has selective permeability, and the sodium ions pass through the ion membrane from the anode chamber to combine with hydroxide to form caustic soda sodium hydroxide. Due to a series of reasons such as the long service life of the ion membrane and mechanical damage, the hydroxide in the cathode chamber can easily pass through the ion membrane into the anode chamber, causing a series of side reactions between the chlorine and hydroxide ions in the anode chamber and eventually producing sodium chlorate. The ion membrane caustic soda production adopts a closed-loop circulation of brine, which makes the chlorate enriched in the brine and the concentration gradually increase. Excessive concentration of chlorate will cause the current efficiency of the electrolytic cell to decrease, which is very corrosive to the equipment and very destructive to the chelating resin tower. Therefore, the chlorate in the brine must be removed. Caustic soda enterprises often set up a decomposition unit to decompose the chlorate in the brine by using hydrochloric acid to react with chlorate to reduce the chlorate content. However, this method requires strong acidity (about 0.8 mol / l) and high temperature (above 85°C). Under high temperature and acidity conditions, chlorate decomposition equipment is seriously damaged and chlorine dioxide is inevitably produced. Chlorine dioxide is extremely unstable and can easily decompose into oxygen and chlorine when exposed to heat or light, causing explosions, thus posing a great threat to the normal production of chemical systems. Summary of the invention
[0003] In view of this, the utility model provides a chlorate decomposition device capable of performing pretreatment and capable of solving the above-mentioned problems.
[0004] A chlorate decomposition device capable of pre-treatment comprises a pre-treatment unit, a decomposition unit connected to the pre-treatment unit through a pipeline, and a pipeline unit for connecting the pre-treatment unit and the decomposition unit. The pre-treatment unit comprises a pre-treatment tank, a heating plate arranged at the bottom of the pre-treatment tank, and a stirring device inserted in the pre-treatment tank. Before entering the decomposition unit, the brine to be treated passes through the pre-treatment unit, is mixed by the stirring device, and is heated to above 85 degrees by the heating device.
[0005] Furthermore, the pretreatment tank body includes a pretreatment input port for inputting hydrochloric acid and brine, and a pretreatment overflow port for outputting the pretreatment liquid processed by the pretreatment unit, and the pretreatment input port and the pretreatment overflow port are respectively arranged on the side walls at both ends of the pretreatment tank body.
[0006] Furthermore, the heating plate includes a heating pipe, an air outlet pipe connected to the heating pipe, and an air inlet pipe arranged parallel to the extension direction of the air outlet pipe.
[0007] Furthermore, the stirring device is suspended on the top of the pretreatment tank to stir the pretreatment liquid.
[0008] Furthermore, the stirring blades of the stirring device are streamlined, so that the brine can be stirred and mixed more easily, so that the brine and hydrochloric acid flowing into the pretreatment unit can be fully mixed.
[0009] Furthermore, the heating pipe is a plurality of concentrically arranged annular pipes, and the air outlet pipe and the air inlet pipe are both connected to each heating pipe.
[0010] Furthermore, the decomposition unit comprises a decomposition tank body, a decomposition unit overflow port arranged on a side wall at one end of the decomposition tank body, and a decomposition unit output port arranged on a side wall at the other end of the decomposition tank body.
[0011] Furthermore, the pipeline unit includes a brine input pipe, a hydrochloric acid input pipe fixedly connected to the brine input pipe, a pretreatment liquid output pipe connected to the pretreatment overflow port and inserted into the decomposition unit, a decomposition liquid output pipe connected to the decomposition unit overflow port, two gas phase pipes respectively arranged on the pretreatment tank body and the top of the decomposition tank body and connected to each other, and a comparison experiment tube connected to the input pipe and the pretreatment liquid output pipe.
[0012] Furthermore, the joint position of one end of the comparative experimental tube connected to the saline input tube is arranged on a side of the hydrochloric acid input tube close to the pretreatment unit.
[0013] Compared with the prior art, the utility model provides a chlorate decomposition device capable of pretreatment, which includes a pretreatment unit, a decomposition unit connected to the pretreatment unit through a pipeline, and a pipeline unit for connecting the pretreatment unit and the decomposition unit. The chlorate decomposition device injects the blended hydrochloric acid and brine into the pretreatment unit for pretreatment before the brine enters the decomposition unit for decomposition. The pretreatment unit includes a pretreatment tank, a heating plate arranged at the bottom of the pretreatment tank, and a stirring device inserted in the pretreatment tank. The pretreatment unit fully mixes the hydrochloric acid and the brine through the stirring device, and heats the temperature to above 85 degrees, which is suitable for chlorate and hydrochloric acid, through the heating plate, thereby improving the decomposition efficiency of chlorate. At the same time, the separate setting of the pretreatment unit avoids damage to the decomposition equipment caused by high temperature and high acidity. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 The utility model provides a schematic flow diagram of a chlorate decomposition device capable of performing pretreatment.
[0015] Figure 2 for Figure 1 A schematic diagram of the structure of a heating plate of a chlorate decomposition device capable of pre-treatment. DETAILED DESCRIPTION
[0016] The following is a further detailed description of the specific embodiments of the present invention. It should be understood that the description of the present invention herein is not intended to limit the protection scope of the present invention.
[0017] like Figure 1 to Figure 2 As shown, it is a chlorate decomposition device that can perform pretreatment provided by the utility model. The pretreatment device for improving chlorate decomposition includes a pretreatment unit 10, a decomposition unit 20 connected to the pretreatment unit 10 through a pipeline, and a pipeline unit 30 for connecting the pretreatment unit 10 and the decomposition unit 20. It is conceivable that the chlorate decomposition device that can perform pretreatment should also include some other functional components, such as electrical connection components, control valve components, etc., which are well known to those skilled in the art and will not be described one by one here.
[0018] The pretreatment unit 10 includes a pretreatment tank 11 , a heating plate 12 disposed at the bottom of the pretreatment tank 11 , and a stirring device 13 inserted into the pretreatment tank 11 .
[0019] The pretreatment tank 11 includes a pretreatment input port 111 for inputting hydrochloric acid and brine, and a pretreatment overflow port 112 for outputting the pretreatment liquid processed by the pretreatment unit 10. The pretreatment input port 111 and the pretreatment overflow port 112 are respectively arranged on the side walls at both ends of the pretreatment tank 11. The pretreatment input port 111 is arranged at one end close to the bottom of the pretreatment tank 11, and the pretreatment overflow port 112 is arranged at one end close to the top of the pretreatment tank 11, so as to ensure that the liquid flowing into the pretreatment unit 10 is fully pretreated, and the liquid flowing out of the pretreatment unit 10 has been pretreated.
[0020] The heating plate 12 is arranged according to the bottom shape of the pretreatment tank 11, so that the liquid flowing into the pretreatment unit 10 is fully heated. Preferably, it can be a circular or square shape that is easy to arrange. The heating plate 12 includes a heating pipe 121, an outlet pipe 122 connected to the heating pipe 121, and an inlet pipe 123 arranged parallel to the extension direction of the outlet pipe 122. The heating pipe 121 is a plurality of concentrically arranged annular pipes, and the outlet pipe 122 and the inlet pipe 123 are both connected to each heating pipe 121.
[0021] The stirring device 13 is suspended on the top of the pretreatment tank 11 to stir the pretreatment liquid. The stirring blades of the stirring device 13 are streamlined, so that the brine can be stirred more easily so that the brine and hydrochloric acid flowing into the pretreatment unit 10 can be fully mixed.
[0022] The decomposition unit 20 includes a decomposition tank body 21, a decomposition unit overflow port 22 arranged on the side wall of one end of the decomposition tank body 21, and a decomposition unit output port 23 arranged on the side wall of the other end of the decomposition tank body 21. The decomposition tank body 21 is used to hold the liquid pretreated by the pretreatment unit 10, and its size can be specifically set according to needs. The decomposition unit overflow port 22 is arranged at the end of the decomposition tank body 21 away from the ground, and is used to output the liquid treated by the decomposition unit 20 to prevent the liquid in the decomposition tank body 21 from overflowing. The decomposition unit output port 23 is arranged at the end of the decomposition tank body 21 close to the ground opposite to the decomposition unit overflow port 22, and is used to output or empty the liquid in the decomposition tank body 21. The decomposition unit 20 itself is a prior art and will not be described in detail here.
[0023] The pipeline unit 30 includes a brine input pipe 31, a hydrochloric acid input pipe 32 fixedly connected to the brine input pipe 31, a pretreatment liquid output pipe 33 connected to the pretreatment overflow port 112 and inserted into the decomposition unit 20, a decomposition liquid output pipe 34 connected to the decomposition unit overflow port 22, two gas phase pipes 35 respectively arranged at the top of the pretreatment tank body 11 and the decomposition tank body 21, and a comparison experiment tube 36 connected to the input pipe 31 and the pretreatment liquid output pipe 33.
[0024] The input salt water input pipe 31 is used to input the modulated salt water of suitable concentration. The hydrochloric acid input pipe 32 is used to input hydrochloric acid. The salt water input pipe 31 and the hydrochloric acid input pipe 32 are connected together through a three-way pipe, and a control valve is provided on the side of the connection between the hydrochloric acid input pipe 32 and the salt water input pipe 31 close to the pretreatment unit 10.
[0025] One end of the pretreatment liquid output pipe 33 is fixedly connected to the pretreatment overflow port 22, and the other end penetrates into the decomposition unit 20 from the top of the decomposition unit 20, and the pipe head is located close to the bottom of the decomposition unit 20 to input the liquid treated by the pretreatment unit 10 into the decomposition unit 20. It can be imagined that a control valve is also provided on the pretreatment output pipe 33.
[0026] The decomposition liquid output pipe 34 includes a decomposition overflow pipe 341 fixedly connected to the decomposition unit overflow port 22, a dechlorination pipeline 342 corresponding to the decomposition overflow pipe 341 and arranged on the side wall of the near-ground end of the decomposition unit 20, and a brine pump 343 arranged on the dechlorination pipeline 342. The decomposition overflow pipe 341 and the dechlorination pipeline 342 are fixedly connected through a three-way pipe. It is conceivable that the decomposition overflow pipe 341 and the dechlorination pipeline 342 are both provided with separate control valves. The brine pump 343 is arranged on the side of the decomposition overflow pipe 341 and the dechlorination pipeline 342 away from the decomposition unit 20, so that it can act on the decomposition overflow pipe 341 and the dechlorination pipeline 342 respectively.
[0027] The gas phase pipe 35 includes a pretreatment gas phase pipe 351 fixedly connected to the pretreatment unit 10 and a decomposition gas phase pipe 352 connected to the decomposition unit 20. The pretreatment gas phase pipe 351 is inserted from the top of the pretreatment tank body 11 and penetrates into the pretreatment tank body 11. The decomposition gas phase pipe 352 penetrates from the top of the decomposition tank body 21 into the decomposition tank body 21. The pipe head positions of the pretreatment gas phase pipe 351 and the decomposition gas phase pipe 352 are respectively higher than the pretreatment overflow port 112 and the decomposition unit overflow port 22, so as to prevent the gas phase pipe 35 from being sealed by liquid and becoming ineffective.
[0028] One end of the comparative experimental tube 36 is connected to the salt water input tube 31 and its joint is arranged on the side of the hydrochloric acid input tube 32 close to the pretreatment unit 10; the other end of the comparative experimental tube 36 is connected to the pretreatment liquid output tube 33. A separate control valve is arranged on the comparative experimental tube 36 to control it. Therefore, the chlorate decomposition device can directly deliver the hydrochloric acid and salt water to the decomposition unit 20 through the comparative experimental tube 36, bypassing the pretreatment unit 10, so as to realize the experimental comparison requirements and verify the effect of the pretreatment unit 10.
[0029] In summary, the brine from the electrolytic cell flows out from the brine input pipe 31 after being measured, and the hydrochloric acid input pipe 32 inputs the measured hydrochloric acid, and the hydrochloric acid and the brine are preliminarily mixed in the pipeline and injected into the pretreatment unit 10. The pretreatment unit 10 fully mixes the inflowing hydrochloric acid and the brine through the stirring device 13, and at the same time, the mixed liquid of hydrochloric acid and brine is heated to above 85 degrees through the heating plate 12. The pretreated pretreatment liquid enters the decomposition unit 20 through the pretreatment liquid output pipe 33 for decomposition. The liquid decomposed in the decomposition unit 20 flows into the brine pump 343 from the decomposition overflow pipe 341 through the decomposition unit overflow port 22, and then enters the dechlorination pipeline 342 for dechlorination. The gas phase generated during the pretreatment process and the decomposition process flows out through the pretreatment gas phase pipe 351 and the decomposition gas phase pipe 352, and goes to the chlorine main pipe together.
[0030] Compared with the prior art, the utility model provides a chlorate decomposition device capable of pretreatment, which includes a pretreatment unit 10, a decomposition unit 20 connected to the pretreatment unit through a pipeline, and a pipeline unit 30 for connecting the pretreatment unit 10 and the decomposition unit 20. The chlorate decomposition device injects the blended hydrochloric acid and brine into the pretreatment unit 10 for pretreatment before the brine enters the decomposition unit 20 for decomposition. The pretreatment unit includes a pretreatment tank 10, a heating plate 12 arranged at the bottom of the pretreatment tank, and a stirring device 13 inserted in the pretreatment tank 11. The pretreatment unit 10 fully mixes the hydrochloric acid and the brine through the stirring device 13, and heats the temperature to above 85 degrees suitable for chlorate and hydrochloric acid through the heating plate 12, thereby improving the decomposition efficiency of chlorate. At the same time, the separate setting of the pretreatment unit 10 avoids damage to the decomposition equipment caused by high temperature and high acidity.
[0031] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement or improvement within the spirit of the present invention are included in the scope of the claims of the present invention.
Claims
1. A chlorate decomposition device capable of pre-treatment, characterized in that: The hydrochloric acid decomposition device capable of pretreatment comprises a pretreatment unit, a decomposition unit connected to the pretreatment unit through a pipeline, and a pipeline unit for connecting the pretreatment unit and the decomposition unit. The pretreatment unit comprises a pretreatment tank body, a heating plate arranged at the bottom of the pretreatment tank body, and a stirring device inserted in the pretreatment tank body.
2. The chlorate decomposition device capable of pretreatment as claimed in claim 1, characterized in that: The pretreatment tank body includes a pretreatment input port for inputting hydrochloric acid and brine, and a pretreatment overflow port for outputting the pretreatment liquid processed by the pretreatment unit. The pretreatment input port and the pretreatment overflow port are respectively arranged on the side walls at both ends of the pretreatment tank body.
3. The chlorate decomposition device capable of pretreatment as claimed in claim 1, characterized in that: The heating plate includes a heating pipe, an air outlet pipe connected to the heating pipe, and an air inlet pipe arranged parallel to the extension direction of the air outlet pipe.
4. The chlorate decomposition device capable of pretreatment as claimed in claim 1, characterized in that: The stirring blades of the stirring device are streamlined, so that the brine can be stirred and mixed more easily, so that the brine and hydrochloric acid flowing into the pretreatment unit can be fully mixed.
5. The chlorate decomposition device capable of pretreatment as claimed in claim 3, characterized in that: The heating pipe is a plurality of concentrically arranged annular pipes, and the air outlet pipe and the air inlet pipe are both connected to each heating pipe.
6. The chlorate decomposition device capable of pretreatment as claimed in claim 1, characterized in that: The stirring device is hung on the top of the pretreatment tank body to stir the pretreatment liquid.
7. The chlorate decomposition device capable of pretreatment as claimed in claim 2, characterized in that: The decomposition unit comprises a decomposition tank body, a decomposition unit overflow port arranged on a side wall at one end of the decomposition tank body, and a decomposition unit output port arranged on a side wall at the other end of the decomposition tank body.
8. The chlorate decomposition device capable of pretreatment as claimed in claim 7, characterized in that: The pipeline unit includes a brine input pipe, a hydrochloric acid input pipe fixedly connected to the brine input pipe, a pretreatment liquid output pipe connected to the pretreatment overflow port and inserted into the decomposition unit, a decomposition liquid output pipe connected to the decomposition unit overflow port, two gas phase pipes respectively arranged on the pretreatment tank body and the top of the decomposition tank body and connected to each other, and a comparison experiment tube connected to the input pipe and the pretreatment liquid output pipe.
9. The chlorate decomposition device capable of pretreatment as claimed in claim 8, characterized in that: The joint position of one end of the comparative experimental tube connected to the saline input tube is arranged on a side of the hydrochloric acid input tube close to the pretreatment unit.