Device for rapidly measuring PH value of liquid and reaction equipment using same

Abstract

The utility model provides a device for quickly measuring the PH value of liquid, which comprises a softened water tank, a water storage tank, a water storage tank and a water storage tank, and is characterized in that softened water is contained in the softened water tank; the to-be-detected liquid tank is filled with to-be-detected liquid; the SV mixer is respectively communicated with the softened water tank and the to-be-measured liquid tank through a first pipeline and a second pipeline, the first pipeline is provided with a softened water pump and a first flow meter, and the second pipeline is provided with a liquid pump and a second flow meter; the PH meter is used for measuring the PH value of the liquid in the SV mixer.

Description

Technical Field

[0001] The utility model relates to a pH value detection device, in particular to a device for quickly measuring the pH value of a liquid and sodium nitrate continuous preparation vacuum extraction reaction equipment using the device. Background Art

[0002] In the prior art, the production of sodium nitrate is intermittent and cannot be achieved continuously. First, the conversion liquid is pumped into the neutralization tower through a nozzle by a pump, and then the alkali solution is pumped into the neutralization tower by a pump. A liquid storage tank is provided at the bottom of the neutralization tower, and the sprayed conversion liquid and the soda solution are stirred and mixed by a stirrer. After stirring for a certain period of time, the stirring is stopped, and the pH value of the neutralized liquid after the reaction is sampled and then the indicator is dripped into the solution to observe the color change. If the sodium nitrate solution is unqualified, a small amount of soda solution is added, and the mixing and stirring are continued. The pH value is tested and the color change after the indicator is added is observed until it is qualified.

[0003] In addition, in the existing sodium nitrate production process, it is necessary to detect the pH value of the conversion liquid and the pH value of the alkali solution in real time. However, since the pH value of the conversion liquid is about 0.2 and the pH value of the alkali solution is about 11.6, the existing pH value detection equipment cannot directly detect the pH value. Therefore, in the production process, it is easy to detect by detecting the final sodium nitrate, that is, detecting the pH value of the neutralized sodium nitrate solution, and then adjusting it. Utility Model Content

[0004] The main purpose of the utility model is to provide a device for quickly measuring the pH value of a liquid and a vacuum extraction reaction device for continuously preparing sodium nitrate using the device, so as to detect the pH value of a conversion liquid and the pH value of an alkaline solution in real time.

[0005] In order to achieve the above object, the utility model provides a device for quickly measuring the pH value of a liquid, comprising:

[0006] A softened water tank, wherein the softened water is contained in the softened water tank;

[0007] A liquid tank to be tested, wherein the liquid tank to be tested contains the liquid to be tested;

[0008] SV mixer, the SV mixer is connected with the softened water tank and the liquid tank to be tested through a first pipeline and a second pipeline respectively, a softened water pump and a first flow meter are arranged on the first pipeline, and a liquid pump and a second flow meter are arranged on the second pipeline;

[0009] PH meter, PH meter is used to measure the pH value of the liquid in the SV mixer.

[0010] Preferably, it also includes a control system, which is electrically connected to the softened water pump, the first flow meter, the liquid pump and the second flow meter respectively.

[0011] Further preferably, the liquid in the liquid tank to be tested is a conversion liquid for converting sodium nitrate, and the mass ratio of the conversion liquid to softened water in the SV mixer is 1:1000.

[0012] Further preferably, the liquid in the liquid tank to be tested is alkaline solution, and the mass ratio of the conversion liquid to the softened water in the SV mixer is 1:1000.

[0013] More preferably, the first pipeline and the second pipeline are respectively provided with solenoid valves, and the solenoid valves are electrically connected to the control system.

[0014] The utility model also provides a vacuum extraction reaction device for continuous preparation of sodium nitrate, comprising the above-mentioned device for quickly measuring the pH value of a liquid, and also comprising a neutralization tower, the neutralization tower comprising a tower body and a plurality of tower plates, the inner part of the tower body being divided into three sealed spaces interconnected with each other, namely a first accommodating space, a second accommodating space and a third accommodating space, wherein the first accommodating space is located at the top of the tower body, the first accommodating space is used to hold a conversion liquid to be converted, the third accommodating space is located in the middle of the tower body, the tower plates are sequentially arranged from top to bottom in the third accommodating space, and the conversion liquid in the first accommodating space enters the second accommodating space through the diversion of these tower plates.

[0015] Preferably, these tower plates are detachably installed in the tower body, and are provided with overflow ports and exhaust ports. The overflow ports are used for the conversion liquid to flow from the upper tower plate into the lower tower plate, and the exhaust ports are used for discharging the gas generated during the neutralization reaction of the conversion liquid. An aeration pipe is provided in each tower plate, and the aeration pipe is connected to an aeration fan arranged outside the neutralization tower.

[0016] Further preferably, gas collecting hoods are respectively provided at the top of the third accommodating space and the top of the first accommodating space, and the top of the gas collecting hood is connected to a vacuum pump arranged outside the neutralization tower through a pipeline.

[0017] The beneficial effects of the utility model are:

[0018] The utility model improves the existing sodium nitrate production equipment, adds a softening water tank and an SV mixer, so that the extracted conversion liquid and softened water are neutralized in a certain proportion, thereby reducing the pH value of the conversion liquid, and then the diluted conversion liquid is tested, thereby achieving the purpose of measuring the pH value of the conversion liquid by using an ordinary pH meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] Figure 1 The utility model is a schematic diagram of the structure of the equipment for the vacuum extraction reaction process of the continuous preparation of sodium nitrate.

[0021] Description of Reference Numerals

[0022] 1. Softened water tank;

[0023] 11. The first softened water pump; 12. The first SV mixer; 13. The first conversion liquid pump;

[0024] 14. First PH tank;

[0025] 21. Second softened water pump; 22. Second SV mixer; 23. First alkali solution pump;

[0026] 24. Second PH tank; 31. Conversion liquid tank; 32. Second conversion liquid pump;

[0027] 41. alkali liquid tank; 42. second alkali liquid pump; 51. third SV mixer;

[0028] 60. Neutralization tower; 61. First accommodation space; 62. Third accommodation space;

[0029] 63. Second accommodating space; 621. Tower tray; 64. Aeration fan;

[0030] 65. Vacuum pump; 71. Finished product tank; 72. Liquid pump; 73. Manual sampling port;

[0031] 81. Fine-tuning tank; 82. Alkali solution dilution tank. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0033] like Figure 1 As shown, this embodiment provides a vacuum extraction reaction equipment for continuous preparation of sodium nitrate, including a control system, a first pH detection device, a second pH detection device, a third SV mixer 51, a neutralization tower 60, a fine-tuning tank 81 and a finished product tank 71.

[0034] The control system is used to control the operation of the entire set of reaction equipment, and the first pH detection device is used to detect the pH concentration of the conversion liquid (the conversion liquid is a strong acidic solution, which is the conversion liquid generated after the sodium nitrite mother liquor in the pre-process is converted, and the conversion liquid contains a mixed solution of sodium nitrate, sodium nitrite, and nitric acid) in real time, and transmit the pH detection result to the control system. In this embodiment, the conversion liquid is stored in the conversion liquid tank 31. Specifically, as Figure 1 As shown, the first pH detection device includes a first conversion liquid pump 13, a first softened water pump 11, a first pH meter and a first SV mixer 12. The first conversion liquid pump 13 is used to draw the conversion liquid in the conversion liquid tank 31 into the first SV mixer 12, and the first softened water pump 11 is used to draw the softened water in the softened water tank 1 into the first SV mixer 12, so that the conversion liquid entering the first SV mixer 12 is diluted by softened water (the conversion liquid before dilution is strongly acidic, with a pH of about 0.2, which cannot be detected by a general pH test paper. Preferably, the mass ratio of the conversion liquid to the softened water in this embodiment is 1:1000), and the diluted solution flows into the first pH tank 14, so that the pH value of the solution in the first pH tank 14 can be detected by the first pH meter. The first pH meter transmits the detected pH result to the control system, so that the hydrogen ion concentration of the free acid in the conversion liquid is calculated by the control system. In addition, the first conversion liquid pump 13 and the first softened water pump 11 are electrically connected to the control system respectively, and the control system controls the start and stop of the first softened water pump 11 and the first conversion liquid pump 13 .

[0035] The second PH detection device is used to detect the PH concentration of the alkali solution in real time, and transmit the PH detection result to the control system. Specifically, the second PH detection device includes a first alkali solution pump 23, a second softening water pump 21, a second PH meter and a second SV mixer 22. The first alkali solution pump 23 is used to draw the alkali solution in the alkali solution tank 41 into the second SV mixer 22, and the second softening water pump 21 is used to draw the softened water in the softening water tank 1 into the second SV mixer 22, so that the alkali solution is diluted by softened water, and the diluted solution is circulated to the second PH tank 24. The second PH meter detects the PH value of the solution in the second PH tank 24 (preferably, the mass ratio of alkali solution to softened water in this embodiment is 1:1000). The second PH meter transmits the detection result of the PH value to the control system, and the control system calculates the hydroxide ion concentration in the alkali solution. The first alkali solution pump 23 and the second softening water pump 21 are electrically connected to the control system respectively, and the control system controls the opening and closing of the first alkali solution pump 23 and the second softening water pump 21.

[0036] The conversion liquid is drawn into the third SV mixer 51 through the second conversion liquid pump 32, the control system detects the flow rate of the conversion liquid entering the third SV mixer 51 in real time, and calculates the total amount entering the third SV mixer 51, the control system calculates the amount of alkali solution added according to the pH results detected by the first pH detection device and the second pH detection device, and controls the amount of alkali solution added to the third SV mixer 51 according to the calculation results. It should be noted that in continuous production, it is necessary to adjust the addition ratio of the two in real time so that the two are fully neutralized. In addition, the control system can control the opening and closing of the second conversion liquid pump 32.

[0037] The neutralized solution formed by mixing the conversion solution and the alkali solution in the third SV mixer 51 is input into the neutralization tower 60, and the neutralized solution is subjected to multi-stage neutralization treatment by the neutralization tower 60 to finally form a qualified neutralized solution. Figure 1 As shown, the neutralization tower 60 includes a tower body and a plurality of tower trays 621 . The inner part of the tower body is divided into three sealed spaces interconnected with each other, namely a first accommodating space 61 , a second accommodating space 63 and a third accommodating space 62 . Among them, the first accommodating space 61 is located at the top of the tower body, and the first accommodating space 61 is used to hold the neutralization liquid transported from the third SV mixer 51. The third accommodating space 62 is located in the middle of the tower body. These tower plates 621 are arranged in sequence from top to bottom in the third accommodating space 62. The neutralization liquid in the first accommodating space 61 enters the second accommodating space 63 through the guidance of these tower plates 621. These tower plates 621 can be detachably installed in the tower body. Each tower plate 621 is provided with an overflow port (not shown in the figure) and an exhaust port (not shown in the figure). The overflow port is used for the conversion liquid to flow from the upper tower plate 621 into the lower tower plate 621, and the exhaust port is used to discharge the gas generated in the neutralization reaction process of the conversion liquid. Each tower plate 621 is provided with an aeration pipe, and the aeration pipe is connected to the aeration fan 64 arranged outside the neutralization tower 60. The aeration pipe is used to promote the discharge of gas in the neutralization liquid.

[0038] In addition, gas collecting hoods are respectively provided at the top of the third accommodation space 62 and the first accommodation space 61, and the top of the gas collecting hood is connected to the vacuum pump 65 provided outside the neutralization tower 60 through a pipeline, so as to recover and process the gas exposed in the first accommodation space 61 and the third accommodation space 62. In this embodiment, the vacuum pump 65 is used to form a similar vacuum environment in the first accommodation space 61 and the third accommodation space 62, so that the gas in the first accommodation space 61 and the third accommodation space 62 rises and is then extracted.

[0039] In addition, it should be noted that sometimes the neutralization liquid in the second storage space 63 does not react fully. Therefore, an aeration pipe is also provided in the second storage space 63. The aeration pipe is connected to the aeration fan 64 arranged outside the neutralization tower 60, and an exhaust port is also provided between the second storage space 63 and the third storage space 62. In this way, the gas generated in the second storage space 63 is discharged into the third storage space 62 through the exhaust port and collected by the gas collecting hood in the third storage space 62.

[0040] A fine-tuning tank 81 is provided outside the neutralization tower 60, wherein the fine-tuning tank 81 is used to hold unqualified neutralized liquid from the neutralization tower 60, and the finished product tank 71 is used to hold qualified neutralized liquid from the neutralization tower 60, and the fine-tuning tank 81 is connected with the finished product tank 71. Specifically, the operator first detects the neutralized liquid in the second accommodation space 63 at the lower part of the neutralization tower 60 through the manual sampling port 73, and if the test result is qualified, the neutralized liquid in the second accommodation space 63 is drawn into the finished product tank 71 through the liquid pump 72. If the test result is unqualified, the neutralized liquid is drawn into the fine-tuning tank 81, and after passing the appropriate fine-tuning treatment, the neutralized liquid in the fine-tuning tank 81 is drawn into the finished product tank 71. During the fine-tuning process, the alkali solution needs to be diluted first (the diluted alkali solution after the pH value is detected can be used, and this embodiment uses the diluted alkali solution), and the diluted alkali solution is stored in the alkali solution dilution tank 82, and then an appropriate amount of the alkali solution dilution liquid is pumped into the fine-tuning tank 81 for fine-tuning, so as to neutralize the unqualified neutralized liquid into a qualified neutralized liquid. In addition, the alkali solution in the alkali solution dilution tank 82 can also be connected to the second accommodating space 63,

[0041] This embodiment also provides a vacuum extraction reaction process for continuous preparation of sodium nitrate, comprising the following steps:

[0042] S100: Pre-neutralization outside the neutralization tower 60:

[0043] Before the conversion liquid is neutralized, the pH value of the conversion liquid is detected in real time by the first pH detection device. Before the alkali solution is neutralized, the pH value of the alkali solution is detected in real time by the second pH detection device. The conversion liquid is pumped into the third SV mixer 51 by the second conversion liquid pump 32. By calculating the pH value of the conversion liquid and the pH value of the alkali solution, the control system calculates the amount of alkali solution that needs to be added, and pumps the alkali solution into the third SV mixer 51 through the second alkali solution pump 42 electrically connected to the control system.

[0044] S200: The mixed conversion liquid and alkali solution in the third SV mixer 51 are transported into the neutralization tower 60 and subjected to multi-stage neutralization to finally form a neutralized liquid. In this step, the mixed conversion liquid is first input into the first accommodation space 61 at the top of the neutralization tower 60, and then the mixed conversion liquid in the first accommodation space 61 falls into the tower plate 621 at the top, and then falls into the tower plate 621 below through the overflow port in the tower plate 621. In this step, each tower plate 621 is provided with an aeration pipe, and the conversion liquid in the tower plate 621 is fully stirred by the aeration pipe. At the same time, the gas generated during the neutralization process of the conversion liquid is quickly discharged from the conversion liquid by the aeration pipe, so as to avoid the gas and the conversion liquid from reacting again to generate acidic substances.

[0045] S300: Collect the neutralized liquid. After the reaction in step S200, the neutralized liquid is stored in the second container at the bottom of the neutralization tower 60. The operator can regularly detect the pH value of the neutralized liquid.

[0046] S400: pumping the qualified neutralization liquid into the finished product tank 71, and pumping the unqualified neutralization liquid into the fine-tuning tank 81;

[0047] S500: Detect the pH value of the neutralizing liquid in the fine-tuning tank 81, calculate the amount of alkali solution that needs to be added, and draw the alkali solution into the fine-tuning tank 81 according to the calculation result, and detect the pH value of the neutralizing liquid. After passing the test, draw the neutralizing liquid in the fine-tuning tank 81 into the finished product tank 71.

[0048] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A device for quickly measuring the pH value of a liquid, characterized in that: include: A softened water tank containing softened water; A liquid tank to be tested, wherein the liquid tank to be tested contains the liquid to be tested; An SV mixer, wherein the SV mixer is connected to the softened water tank and the liquid tank to be tested through a first pipeline and a second pipeline respectively, a softened water pump and a first flow meter are arranged on the first pipeline, and a liquid pump and a second flow meter are arranged on the second pipeline; A pH meter is used to measure the pH value of the liquid in the SV mixer.

2. A device for quickly measuring the pH value of a liquid according to claim 1, characterized in that: It also includes a control system, which is electrically connected to the softened water pump, the first flow meter, the liquid pump and the second flow meter respectively.

3. A device for quickly measuring the pH value of a liquid according to claim 2, characterized in that: The liquid in the liquid tank to be tested is a conversion liquid for converting sodium nitrate, and the mass ratio of the conversion liquid to softened water in the SV mixer is 1:1000.

4. A device for rapidly measuring the pH value of a liquid according to claim 2, characterized in that: The liquid in the liquid tank to be tested is alkali solution, and the mass ratio of the conversion liquid to softened water in the SV mixer is 1:1000.

5. A device for rapidly measuring the pH value of a liquid according to any one of claims 3 or 4, characterized in that: The first pipeline and the second pipeline are respectively provided with solenoid valves, and the solenoid valves are electrically connected to the control system.

6. A vacuum extraction reaction equipment for continuous preparation of sodium nitrate, characterized in that: A device for quickly measuring the pH value of a liquid as described in any one of claims 1 to 5, and also includes a neutralization tower, the neutralization tower includes a tower body and a plurality of tower plates, the inner part of the tower body is three sealed spaces interconnected with each other, namely a first accommodating space, a second accommodating space and a third accommodating space, wherein the first accommodating space is located at the top of the tower body, the first accommodating space is used to hold a conversion liquid to be converted, the third accommodating space is located in the middle of the tower body, the tower plates are arranged in sequence from top to bottom in the third accommodating space, and the conversion liquid in the first accommodating space enters the second accommodating space through the diversion of these tower plates.

7. A vacuum extraction reaction equipment for continuous preparation of sodium nitrate according to claim 6, characterized in that: These tower plates are detachably installed in the tower body, and are provided with overflow ports and exhaust ports. The overflow ports are used for the conversion liquid to flow from the upper tower plate into the lower tower plate, and the exhaust ports are used for discharging the gas generated during the neutralization reaction of the conversion liquid. An aeration pipe is provided in each tower plate, and the aeration pipe is connected to an aeration fan arranged outside the neutralization tower.

8. A vacuum extraction reaction equipment for continuous preparation of sodium nitrate according to claim 7, characterized in that: Gas collecting hoods are respectively arranged at the top of the third accommodating space and the first accommodating space, and the tops of the gas collecting hoods are communicated with a vacuum pump arranged outside the neutralization tower through a pipeline.

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