System capable of carrying out automatic acid-base titration

Abstract

The utility model provides a set of system capable of carrying out automatic acid-base titration. The system comprises a dilute acid storage tank, a dilute alkali storage tank and a tank to be subjected to pH regulation, the dilute acid storage tank is respectively connected with a concentrated acid pipeline, a dilute acid water replenishing pipeline and a dilute acid burette pipeline, a concentrated acid adding pipeline is connected between the concentrated acid pipeline and the dilute acid burette pipeline, and the dilute acid storage tank is connected with the PH-to-be-adjusted tank through the dilute acid burette pipeline; the dilute alkali storage tank is respectively connected with a concentrated alkali pipeline, a dilute alkali water replenishing pipeline and a dilute alkali burette pipeline, a concentrated alkali adding pipeline is connected between the concentrated alkali pipeline and the dilute alkali burette pipeline, and the dilute alkali storage tank is connected with the PH-to-be-adjusted tank through the dilute alkali burette pipeline. According to the utility model, the pH of the liquid to be adjusted can be accurately measured, so that the acid-base dripping end point can be conveniently and accurately judged; dilute liquid preparation or concentrated liquid dripping can be automatically carried out according to manually input parameters; dilute liquid water replenishing and cleaning of the storage tank and the tank to be subjected to pH regulation can be performed, so that different acids and bases can be conveniently replaced subsequently for titration.

Description

Technical Field

[0001] The utility model relates to the field of acid-base titration experiments in industrial water treatment, in particular to a system capable of performing automatic acid-base titration. Background Art

[0002] Currently, there is no device that can automatically test the amount of acid or alkali used to adjust the pH of an acidic solution by adding acid or alkali or alkali to increase the pH of an alkaline solution.

[0003] According to the utility model patent with patent number CN109459430B and patent name A kind of acid-base titration device and titration method, this technical method belongs to the field of chemical product detection. The innovation of this method is only to use a stirring device to stir to avoid manual shaking to cause result errors and introduce a pressure sensor into the liquid holding tube to accurately measure the amount of liquid, and it cannot realize fully automatic acid-base titration;

[0004] According to the utility model patent with patent number CN101975865B and patent name of automatic titration system for acid and alkali solution, the device needs to manually add acid or alkali to the acid and alkali solution titration cup, and can only perform titration of adding acid or alkali at a time, and cannot automatically add acid or alkali according to the measured solution. The acid addition speed adopts gravity flow and is controlled by a valve. The acid addition speed is not linear and there is no stirring system, so the titration endpoint is inaccurate.

[0005] According to the utility model patent with patent number CN211235711 U and patent name "pH dynamic balance acid-base double titrator", the acid and base need to be manually prepared and added to the corresponding long-necked graduated container, and there is no stirring device. The acid-base neutralization may cause errors in the titration end point due to inadequate preparation. Although semi-automation is achieved, manual preparation and stirring are still required. Utility Model Content

[0006] In order to solve the above difficulties, the utility model provides a system capable of performing automatic acid-base titration.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A system capable of performing automatic acid-base titration, characterized in that: it comprises a dilute acid storage tank, a dilute alkali storage tank and a pH tank to be adjusted; the dilute acid storage tank is respectively connected with a concentrated acid pipeline, a dilute acid water replenishment pipeline and a dilute acid titration pipeline, a concentrated acid adding pipeline is connected between the concentrated acid pipeline and the dilute acid titration pipeline, and the dilute acid storage tank is connected to the pH tank to be adjusted through the dilute acid titration pipeline; the dilute alkali storage tank is respectively connected with a concentrated alkali pipeline, a dilute alkali water replenishment pipeline and a dilute alkali titration pipeline, a concentrated alkali adding pipeline is connected between the concentrated alkali pipeline and the dilute alkali titration pipeline, and the dilute alkali storage tank is connected to the pH tank to be adjusted through the dilute alkali titration pipeline; it also comprises a water inlet sample pipeline, and the water inlet sample pipeline is connected to the pH tank to be adjusted; a stirrer is arranged in the dilute acid storage tank, the dilute alkali storage tank and the pH tank to be adjusted.

[0009] Preferably, a dilute acid water supply valve is provided on the dilute acid water supply pipeline, a dilute alkali water supply valve is provided on the dilute alkali water supply pipeline, the dilute acid water supply pipeline is connected to the dilute alkali water supply pipeline and both are connected to the main water supply pipeline, and a main water supply valve is provided on the main water supply pipeline.

[0010] Preferably, the concentrated acid pipeline is provided with a concentrated acid main valve, an acid replenishing valve, a concentrated acid storage tank, a concentrated acid valve, a concentrated acid metering pump, a concentrated acid outlet valve, and a dilute acid valve in sequence along the flow direction of the concentrated acid liquid; the concentrated alkali pipeline is provided with a concentrated alkali main valve, an alkali replenishing valve, a concentrated alkali storage tank, a concentrated alkali valve, a concentrated alkali metering pump, a concentrated alkali outlet valve, and a dilute alkali valve in sequence along the flow direction of the concentrated alkali liquid.

[0011] Preferably, the concentrated acid adding pipeline is connected to the concentrated acid pipeline between the concentrated acid outlet valve and the diluted acid preparing valve, and the concentrated acid adding pipeline is provided with a concentrated acid adding valve and a first check valve in sequence along the flow direction of the concentrated acid liquid; the concentrated alkali adding pipeline is connected to the concentrated alkali adding pipeline between the concentrated alkali outlet valve and the diluted alkali preparing valve, and the concentrated alkali adding pipeline is provided with a concentrated alkali adding valve and a second check valve in sequence along the flow direction of the concentrated alkali liquid.

[0012] Preferably, the dilute acid titration pipeline is provided with a dilute acid valve and a dilute acid metering pump in sequence along the flow direction of the dilute acid liquid; the dilute alkali titration pipeline is provided with a dilute alkali valve and a dilute alkali metering pump in sequence along the flow direction of the dilute alkali liquid.

[0013] Preferably, a water inlet sample valve is provided on the water inlet sample pipeline.

[0014] Preferably, the concentrated acid storage tank is connected to a concentrated acid discharge pipeline, and a concentrated acid discharge valve is provided on the concentrated acid discharge pipeline; the concentrated alkali storage tank is connected to a concentrated alkali discharge pipeline, and a concentrated alkali discharge valve is provided on the concentrated alkali discharge pipeline; the concentrated acid discharge pipeline and the concentrated alkali discharge pipeline are both connected to a concentrated liquid total discharge pipeline, and a concentrated liquid total discharge valve is provided on the concentrated liquid total discharge pipeline; the dilute acid storage tank is connected to a dilute acid discharge pipeline, and a dilute acid discharge valve is provided on the dilute acid discharge pipeline; the dilute alkali storage tank is connected to a dilute alkali discharge pipeline, and a dilute alkali discharge valve is provided on the dilute alkali discharge pipeline, and the dilute acid discharge pipeline and the dilute alkali discharge pipeline are both connected to a dilute liquid total discharge pipeline, and a dilute liquid total discharge valve is provided on the dilute liquid total discharge pipeline; the PH tank to be adjusted is connected to a discharge pipeline, and a discharge valve is provided on the discharge pipeline; the concentrated liquid total discharge pipeline, the dilute liquid total discharge pipeline and the discharge pipeline are all connected to a total discharge pipeline.

[0015] Preferably, the concentrated acid storage tank is connected to a concentrated acid cleaning pipeline, and a concentrated acid cleaning valve is provided on the concentrated acid cleaning pipeline; the concentrated alkali storage tank is connected to a concentrated alkali cleaning pipeline, and a concentrated alkali cleaning valve is provided on the concentrated alkali cleaning pipeline; the concentrated acid cleaning pipeline and the concentrated alkali cleaning pipeline are connected to a total cleaning pipeline, and a total cleaning valve is provided on the total cleaning pipeline; the PH tank to be adjusted is connected to a PH tank to be adjusted cleaning pipeline, and a PH tank to be adjusted cleaning valve is provided on the PH tank to be adjusted cleaning pipeline; the total cleaning pipeline and the PH tank to be adjusted cleaning pipeline are both connected to the total water replenishment pipeline.

[0016] Preferably, the stirrer of the pH tank to be adjusted is a magnetic stirrer.

[0017] Preferably, the concentrated acid storage tank is provided with a first liquid level indicator, the concentrated alkali storage tank is provided with a second liquid level indicator, the dilute acid storage tank is provided with a third liquid level indicator, and the dilute alkali storage tank is provided with a fourth liquid level indicator; the pH tank to be adjusted is provided with a high liquid level alarm sensor, a low liquid level alarm sensor and a pH probe.

[0018] The beneficial effects of the utility model are as follows: 1. The pH of the liquid to be adjusted is accurately measured by the pH probe, so as to facilitate and accurately judge the end point of acid and alkali addition; 2. A concentrated acid storage tank, a concentrated alkali storage tank, a dilute acid storage tank, and a dilute alkali storage tank are added, and the dilute liquid can be prepared or the concentrated liquid can be added automatically according to the parameters input manually; 3. A fully automatic valve and metering pump control are added, and the principle is simple and reduces manual intervention; 4. A pipeline for providing pure water is added, and the dilute liquid can be replenished and the storage tank and the pH tank to be adjusted can be cleaned, which is convenient for subsequent replacement of different acids and alkalis for titration; 5. High liquid level and low liquid level alarms are added to the pH tank to be adjusted to avoid overflowing of the pH tank to be adjusted; 6. Concentrated acid and concentrated alkali solutions are added, and acidic acid addition and alkaline alkali addition can be adjusted, thereby broadening the scope of use; 7. Acid and alkali can be automatically added to the end point according to the set pH, and it is not limited to acid-base neutralization titration; 8. A magnetic stirring system is added to make the acid-base reaction more sufficient and reduce the error of manual stirring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Among them: dilute acid storage tank 1, concentrated acid storage tank 2, PH tank to be adjusted 3, concentrated acid pipeline 4, dilute acid water supply pipeline 5, dilute acid titration pipeline 6, dilute acid discharge pipeline 7, concentrated acid addition pipeline 8, concentrated alkali pipeline 9, dilute alkali water supply pipeline 10, dilute alkali titration pipeline 11, dilute alkali discharge pipeline 12, concentrated alkali addition pipeline 13, water sample pipeline 14, mixer 15, dilute acid water supply valve 16, dilute alkali water supply valve 17, total water supply pipeline 18, total Water replenishment valve 19, concentrated acid main valve 20, acid replenishment valve 21, concentrated acid storage tank 22, concentrated acid valve 23, concentrated acid metering pump 24, concentrated acid outlet valve 25, diluted acid valve 26, concentrated alkali main valve 27, alkali replenishment valve 28, concentrated alkali storage tank 29, concentrated alkali valve 30, concentrated alkali metering pump 31, concentrated alkali outlet valve 32, diluted alkali valve 33, concentrated acid replenishment valve 34, first check valve 35, concentrated alkali replenishment valve 36, second check valve 37, diluted acid valve 38, Diluted acid metering pump 39, diluted alkali valve 40, diluted alkali metering pump 41, water inlet valve 42, concentrated acid discharge pipeline 43, concentrated acid discharge valve 44, concentrated alkali discharge pipeline 45, concentrated alkali discharge valve 46, concentrated liquid total discharge pipeline 47, concentrated liquid total discharge valve 48, diluted acid discharge valve 49, diluted alkali discharge valve 50, diluted liquid total discharge pipeline 51, diluted liquid total discharge valve 52, discharge pipeline 53, discharge valve 54, total discharge pipeline 55, concentrated acid cleaning pipeline 56, concentrated acid cleaning valve 57, concentrated alkali cleaning pipeline 58, concentrated alkali cleaning valve 59, total cleaning pipeline 60, total cleaning valve 61, cleaning pipeline 62 of pH tank to be adjusted, cleaning valve 63 of pH tank to be adjusted, first liquid level indicator 64, second liquid level indicator 65, third liquid level indicator 66, fourth liquid level indicator 67, high liquid level alarm sensor 68, low liquid level alarm sensor 69, pH probe 70. DETAILED DESCRIPTION

[0021] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0022] like Figure 1 As shown, the utility model provides a system for automatic acid-base titration, which includes a dilute acid storage tank 1 for configuring dilute acid, a dilute alkali storage tank 2 for configuring dilute alkali, and a pH tank to be adjusted 3 for acid-base titration. The dilute acid storage tank 1 is respectively connected with a concentrated acid pipeline 4 for providing concentrated acid, a dilute acid water replenishment pipeline 5 for providing pure water, a dilute acid titration pipeline 6, and a dilute acid discharge pipeline 7. A concentrated acid adding pipeline 8 is connected between the concentrated acid pipeline 4 and the dilute acid titration pipeline 6. The dilute acid storage tank 1 is connected to the pH tank to be adjusted 3 through the dilute acid titration pipeline 6, and the dilute acid titration pipeline 6 is used to provide dilute acid to the pH tank to be adjusted 3. The dilute alkali storage tank 2 is respectively connected with a concentrated alkali pipeline 9 for providing concentrated alkali, a dilute alkali water replenishment pipeline 10 for providing pure water, a dilute alkali titration pipeline 11, and a dilute alkali discharge pipeline 12. A concentrated alkali adding pipeline 13 is connected between the concentrated alkali pipeline 9 and the dilute alkali titration pipeline 11. The diluted alkali storage tank 2 is connected to the PH tank 3 to be adjusted via a diluted alkali titration pipeline 11, and the diluted alkali titration pipeline 11 is used to provide diluted alkali to the PH tank 3 to be adjusted. It also includes a water sample inlet pipeline 14 for providing water sample to the PH tank 3 to be adjusted, and the water sample inlet pipeline 14 is connected to the PH tank 3 to be adjusted. A stirrer 15 is provided in the diluted acid storage tank 1, the diluted alkali storage tank 2 and the PH tank 3 to be adjusted, so as to fully stir the solution in the storage tank. The stirrer 15 of the utility model is an automatic stirrer. Specifically, the stirrer 15 of the PH tank 3 to be adjusted is a magnetic stirrer, which can make the acid-base reaction more complete and reduce the error of manual stirring.

[0023] Further, a dilute acid water supply valve 16 is provided on the dilute acid water supply pipeline 5. A dilute alkali water supply valve 17 is provided on the dilute alkali water supply pipeline 10. The dilute acid water supply pipeline 5 is connected to the dilute alkali water supply pipeline 10 and both are connected to the main water supply pipeline 18, and the main water supply pipeline 18 is provided with a main water supply valve 19. By using the main water supply valve 19, the dilute acid water supply pipeline 5 and the dilute alkali water supply pipeline 10, the water supply of the dilute acid storage tank 1 and the dilute alkali storage tank 2 when configuring the dilute liquid is controlled.

[0024] Furthermore, the concentrated acid pipeline 4 is provided with a concentrated acid main valve 20, an acid replenishing valve 21, a concentrated acid storage tank 22, a concentrated acid valve 23, a concentrated acid metering pump 24, a concentrated acid outlet valve 25, and a dilute acid valve 26 in sequence along the flow direction of the concentrated acid liquid. The concentrated alkali pipeline 9 is provided with a concentrated alkali main valve 27, an alkali replenishing valve 28, a concentrated alkali storage tank 29, a concentrated alkali valve 30, a concentrated alkali metering pump 31, a concentrated alkali outlet valve 32, and a dilute alkali valve 33 in sequence along the flow direction of the concentrated alkali liquid. By utilizing the valves and metering pumps of the concentrated acid pipeline 4 and the concentrated alkali pipeline 9, the concentration and dosage of the dilute acid solution and the dilute alkali solution can be automatically controlled.

[0025] Further, the concentrated acid adding pipeline 8 is connected to the concentrated acid pipeline 4 between the concentrated acid outlet valve 25 and the diluted acid valve 26, and the concentrated acid adding pipeline 8 is provided with a concentrated acid adding valve 34 and a first check valve 35 in sequence along the flow direction of the concentrated acid liquid. The concentrated alkali adding pipeline 13 is connected to the concentrated alkali adding pipeline 9 between the concentrated alkali outlet valve 32 and the diluted alkali valve 33, and the concentrated alkali adding pipeline 13 is provided with a concentrated alkali adding valve 36 and a second check valve 37 in sequence along the flow direction of the concentrated alkali liquid. The concentrated acid adding pipeline 8 and the concentrated alkali adding pipeline 13 are mainly used for qualitative titration. In special cases, titration with concentrated acid or concentrated alkali can avoid errors caused by an increase in the volume of the titrant due to the concentration problem of the dilute solution.

[0026] Furthermore, the dilute acid titration pipeline 6 is provided with a dilute acid valve 38 and a dilute acid metering pump 39 in sequence along the flow direction of the dilute acid liquid. The dilute alkali titration pipeline 11 is provided with a dilute alkali valve 40 and a dilute alkali metering pump 41 in sequence along the flow direction of the dilute alkali liquid. The metering pump is used to accurately control the acid and alkali addition speed, which is more linear and accurate, reduces the experimental error caused by the use of gravity addition valve control, and also reduces manual intervention.

[0027] Furthermore, a water sample inlet valve 42 is provided on the water sample inlet pipeline 14, and the water sample inlet valve 42 can be used to control the amount of water sample in the pH tank 3 to be adjusted.

[0028] Further, the concentrated acid storage tank 22 is connected to a concentrated acid discharge pipeline 43, and a concentrated acid discharge valve 44 is provided on the concentrated acid discharge pipeline 43. The concentrated alkali storage tank 29 is connected to a concentrated alkali discharge pipeline 45, and a concentrated alkali discharge valve 46 is provided on the concentrated alkali discharge pipeline 45. The concentrated acid discharge pipeline 43 and the concentrated alkali discharge pipeline 45 are both connected to a concentrated liquid total discharge pipeline 47, and a concentrated liquid total discharge valve 48 is provided on the concentrated liquid total discharge pipeline 47. The dilute acid storage tank 1 is connected to a dilute acid discharge pipeline 7, and a dilute acid discharge valve 49 is provided on the dilute acid discharge pipeline 7. The dilute alkali storage tank 2 is connected to a dilute alkali discharge pipeline 12, and a dilute alkali discharge valve 50 is provided on the dilute alkali discharge pipeline 12. The dilute acid discharge pipeline 7 and the dilute alkali discharge pipeline 12 are both connected to a dilute liquid total discharge pipeline 51, and a dilute liquid total discharge valve 52 is provided on the dilute liquid total discharge pipeline 51. The pH tank 3 to be adjusted is connected to a discharge pipeline 53, and a discharge valve 54 is provided on the discharge pipeline 53. The concentrated solution total discharge pipeline 47, the diluted solution total discharge pipeline 51 and the discharge pipeline 53 are all connected to a total discharge pipeline 55. The utility model adds a solution discharge system, and the solution can be discharged by controlling the above-mentioned discharge valve to achieve acid-base balance and reduce acid and alkali pollution.

[0029] Further, the concentrated acid storage tank 22 is connected to a concentrated acid cleaning pipeline 56, and a concentrated acid cleaning valve 57 is provided on the concentrated acid cleaning pipeline 56. The concentrated alkali storage tank 29 is connected to a concentrated alkali cleaning pipeline 58, and a concentrated alkali cleaning valve 59 is provided on the concentrated alkali cleaning pipeline 58. The concentrated acid cleaning pipeline 56 and the concentrated alkali cleaning pipeline 58 are connected to a total cleaning pipeline 60, and a total cleaning valve 61 is provided on the total cleaning pipeline 60. The pH tank to be adjusted 3 is connected to a pH tank to be adjusted cleaning pipeline 62, and a pH tank to be adjusted cleaning valve 63 is provided on the pH tank to be adjusted cleaning pipeline 62. The total cleaning pipeline 60 and the pH tank to be adjusted cleaning pipeline 62 are both connected to the total water replenishment pipeline 18. The utility model adds a cleaning system and a discharge system to facilitate the replacement of concentrated acid, concentrated alkali, dilute acid, and dilute alkali solutions.

[0030] The concentrated acid storage tank 22 is provided with a first liquid level indicator 64. The concentrated alkali storage tank 29 is provided with a second liquid level indicator 65. The dilute acid storage tank 1 is provided with a third liquid level indicator 66. The dilute alkali storage tank 2 is provided with a fourth liquid level indicator 67. The pH tank 3 to be adjusted is provided with a high liquid level alarm sensor 68 and a low liquid level alarm sensor 69 to prevent the pH tank 3 to be adjusted from overflowing. The pH tank 3 to be adjusted is also provided with a pH probe 70. The pH probe 70 used in the utility model is an online detection pH meter, which can accurately measure the pH of the liquid to be adjusted to facilitate and accurately determine the end point of acid and alkali addition, without manually determining the pH value to perform acid or alkali addition operations; compared with the colorimetric method for determining the titration end point, it is more accurate and has a wider range.

[0031] The specific implementation process of this utility model:

[0032] In the initial state, all valves of the utility model are in the closed state.

[0033] When the system is first started, the acid replenishment valve 21 on the concentrated acid pipeline 4 and the alkali replenishment valve 28 on the concentrated alkali pipeline 9 will be opened, and the concentrated acid and concentrated alkali will enter the concentrated acid storage tank 22 and the concentrated alkali storage tank 29 for storage, respectively. After the liquid levels reach the respective set liquid levels, the respective acid replenishment valves 21 and alkali replenishment valves 28 are closed to return to the initial state. The liquid level of the concentrated acid storage tank 21 is measured by the first liquid level indicator 64, and the liquid level of the concentrated alkali storage tank 29 is measured by the second liquid level indicator 65.

[0034] When configuring the dilute solution, input the concentration and dosage of the dilute acid solution and dilute alkali solution to be configured. Taking the acid side as an example, the concentrated acid valve 23, the concentrated acid metering pump 24, the concentrated acid outlet valve 25, and the dilute acid valve 26 on the concentrated acid pipeline 4 are opened for acid addition, the dilute acid water replenishment valve 16 of the dilute acid water replenishment pipeline 5 is opened for water addition, and the mixer (not shown) of the dilute acid storage tank 1 will be opened after the liquid level is higher than the stirring blade (not shown). The liquid level of the dilute acid storage tank 1 is measured by the third liquid level indicator 66. After the amount of concentrated acid and pure water is satisfied, close all the above valves and return to the initial state. The alkali side follows the same steps to configure the dilute solution. The concentrated alkali valve 30, the concentrated alkali metering pump 31, the concentrated alkali outlet valve 32, and the dilute alkali valve 33 on the concentrated alkali pipeline 9 are opened for alkali addition, the dilute alkali water replenishment valve 17 of the dilute alkali water replenishment pipeline will be opened for water addition, and the mixer (not shown) of the dilute alkali storage tank 2 will be opened after the liquid level is higher than the stirring blade (not shown). The liquid level of the diluted alkali storage tank 2 is measured by the fourth liquid level indicator 67. After the amount of concentrated alkali and the amount of pure water are satisfied, all the above valves are closed and returned to the initial state.

[0035] When performing acid-base titration, the water inlet valve 42 of the water inlet pipe 14 will open to let in water, and the pH and liquid level of the pH tank 3 to be adjusted will be measured by the high liquid level alarm sensor 68, the low liquid level alarm sensor 69 and the pH probe 70. When the liquid level of the pH tank 3 to be adjusted reaches the specified liquid level, the water inlet valve 42 will be closed, and the system will judge whether to open the dilute acid titration pipe 6 on the acid side or the dilute alkali burette 11 on the alkali side for titration based on the value of the pH probe 70 and the manually set end point value. By default, the system performs acid-base neutralization titration, that is, if the pH is less than 7, the dilute alkali valve 40 will be opened for alkali titration, and the magnetic stirrer 15 will be turned on to stir the pH tank 3 to achieve a uniform dripping effect, and the pH will end when the pH is equal to 7; if the pH is greater than 7, the dilute acid valve 38 will be opened for acid titration, and the magnetic stirrer 15 will be turned on to stir the pH tank 3 to achieve a uniform dripping effect, and the pH will end when the pH is equal to 7. When setting manually, there may be situations where acid is added to adjust the acidity or alkali is added to adjust the alkali. For example, when the pH of the water sample is 8 and the titration endpoint is manually set to 11, the system determines that the dilute acid titration line 6 will not be opened. At this time, the dilute alkali valve 40 of the dilute alkali titration line 11 is opened, and the configured dilute alkali solution is slowly added. At the same time, the magnetic stirrer 15 is turned on to stir the pH tank 3 to be adjusted to achieve the effect of uniform dripping. When the pH approaches the set endpoint, the dripping speed will slow down until the titration endpoint. At this time, the accurate amount of alkali added can be obtained by counting the metering pump. Similarly, the amount of acid added can also be obtained. In practice, there will be situations where titration is performed from acidity to alkalinity or alkalinity to acidity. Following the same titration principle and operating logic, the corresponding accurate amount of alkali and acid addition can be obtained.

[0036] In special cases, by opening the concentrated acid adding pipeline 8 or the concentrated alkali adding pipeline 13 and titrating with concentrated acid or concentrated alkali, the error caused by the increase in the volume of the titrant in the pH tank 3 to be adjusted due to the concentration problem of the dilute solution can be avoided. When performing acid-base titration, according to the set titration end point, the concentrated acid adding pipeline 8 or the concentrated alkali adding pipeline 13 on the alkali side is selected. If the concentrated acid adding pipeline 8 is selected, the concentrated acid adding valve 34 and the first check valve 35 are opened, and the magnetic stirrer 15 is opened at the same time to stir the pH tank 3 to be adjusted to achieve the effect of uniform dripping, and the process ends when the set pH is reached; if the concentrated alkali adding pipeline 13 is selected, the concentrated alkali adding valve 36 and the second check valve 37 are opened, and the magnetic stirrer 15 is opened at the same time to stir the pH tank 3 to be adjusted to achieve the effect of uniform dripping, and the process ends when the set pH is reached.

[0037] When discharging liquid, for the sake of system safety, discharge valves are installed at the bottom of concentrated acid storage tank 22, concentrated alkali storage tank 29, dilute acid storage tank 1, dilute alkali storage tank 2 and pH tank to be adjusted 3. In emergency, you can choose to open concentrated acid discharge valve 44, concentrated alkali discharge valve 46, dilute acid discharge valve 49, dilute alkali discharge valve 50 and discharge valve 54 for discharge to achieve acid-base balance and reduce acid and alkali pollution.

[0038] When cleaning the tank body, in order to clean the concentrated acid storage tank 22, the concentrated alkali storage tank 29 and the pH tank to be adjusted 3, the utility model is also provided with a concentrated acid cleaning valve 57, a concentrated alkali cleaning valve 59, and a pH cleaning valve to be adjusted 63. The above-mentioned cleaning valves are opened and connected to the main water supply pipeline 18, and they can be cleaned separately, and the concentrated acid discharge valve 44, the concentrated alkali discharge valve 46, the dilute acid discharge valve 49, the dilute alkali discharge valve 50, and the discharge valve 54 are opened to facilitate the subsequent replacement of different acid solutions and alkali solutions for titration.

[0039] The valves of the utility model are all fully automatic valves and metering pumps existing in the field. Through the control of the valves and metering pumps, manual intervention can be reduced. Only the concentration of the dilute acid and alkali to be prepared needs to be manually set, and the system can complete the preparation. According to the pH value of the acid-base titration, the corresponding dilute acid titration pipeline 6 and the dilute alkali titration pipeline 11 are automatically opened for dripping and accurately adjusted to the end point.

[0040] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A system for automatic acid-base titration, characterized by: It comprises a dilute acid storage tank, a dilute alkali storage tank and a pH tank to be adjusted; the dilute acid storage tank is respectively connected with a concentrated acid pipeline, a dilute acid water replenishment pipeline and a dilute acid titration pipeline, a concentrated acid adding pipeline is connected between the concentrated acid pipeline and the dilute acid titration pipeline, and the dilute acid storage tank is connected with the pH tank to be adjusted through the dilute acid titration pipeline; the dilute alkali storage tank is respectively connected with a concentrated alkali pipeline, a dilute alkali water replenishment pipeline and a dilute alkali titration pipeline, a concentrated alkali adding pipeline is connected between the concentrated alkali pipeline and the dilute alkali titration pipeline, and the dilute alkali storage tank is connected with the pH tank to be adjusted through the dilute alkali titration pipeline; it also comprises a water inlet sample pipeline, and the water inlet sample pipeline is connected with the pH tank to be adjusted; the dilute acid storage tank, the dilute alkali storage tank and the pH tank to be adjusted are all provided with a stirrer.

2. The system for automatic acid-base titration according to claim 1, characterized in that: The dilute acid water supply pipeline is provided with a dilute acid water supply valve, the dilute alkali water supply pipeline is provided with a dilute alkali water supply valve, the dilute acid water supply pipeline is connected with the dilute alkali water supply pipeline and both are connected to the main water supply pipeline, and the main water supply pipeline is provided with a main water supply valve.

3. The system for automatic acid-base titration according to claim 2, characterized in that: The concentrated acid pipeline is provided with a concentrated acid main valve, an acid replenishing valve, a concentrated acid storage tank, a concentrated acid valve, a concentrated acid metering pump, a concentrated acid outlet valve, and a dilute acid valve in sequence along the flow direction of the concentrated acid liquid; the concentrated alkali pipeline is provided with a concentrated alkali main valve, an alkali replenishing valve, a concentrated alkali storage tank, a concentrated alkali valve, a concentrated alkali metering pump, a concentrated alkali outlet valve, and a dilute alkali valve in sequence along the flow direction of the concentrated alkali liquid.

4. The system for automatic acid-base titration according to claim 3, characterized in that: The concentrated acid adding pipeline is connected to the concentrated acid pipeline between the concentrated acid outlet valve and the dilute acid preparing valve, and the concentrated acid adding pipeline is provided with a concentrated acid adding valve and a first check valve in sequence along the flow direction of the concentrated acid liquid; the concentrated alkali adding pipeline is connected to the concentrated alkali pipeline between the concentrated alkali outlet valve and the dilute alkali preparing valve, and the concentrated alkali adding pipeline is provided with a concentrated alkali adding valve and a second check valve in sequence along the flow direction of the concentrated alkali liquid.

5. The system for automatic acid-base titration according to claim 3, characterized in that: The dilute acid titration pipeline is provided with a dilute acid valve and a dilute acid metering pump in sequence along the flow direction of the dilute acid liquid; the dilute alkali titration pipeline is provided with a dilute alkali valve and a dilute alkali metering pump in sequence along the flow direction of the dilute alkali liquid.

6. The system for automatic acid-base titration according to claim 3, characterized in that: The water inlet sample pipeline is provided with a water inlet sample valve.

7. The system for automatic acid-base titration according to claim 3, characterized in that: The concentrated acid storage tank is connected to a concentrated acid discharge pipeline, and a concentrated acid discharge valve is arranged on the concentrated acid discharge pipeline; the concentrated alkali storage tank is connected to a concentrated alkali discharge pipeline, and a concentrated alkali discharge valve is arranged on the concentrated alkali discharge pipeline; the concentrated acid discharge pipeline and the concentrated alkali discharge pipeline are both connected to a concentrated liquid total discharge pipeline, and a concentrated liquid total discharge valve is arranged on the concentrated liquid total discharge pipeline; the dilute acid storage tank is connected to a dilute acid discharge pipeline, and a dilute acid discharge valve is arranged on the dilute acid discharge pipeline; the dilute alkali storage tank is connected to a dilute alkali discharge pipeline, and a dilute alkali discharge valve is arranged on the dilute alkali discharge pipeline, and the dilute acid discharge pipeline and the dilute alkali discharge pipeline are both connected to a dilute liquid total discharge pipeline, and a dilute liquid total discharge valve is arranged on the dilute liquid total discharge pipeline; the PH tank to be adjusted is connected to a discharge pipeline, and a discharge valve is arranged on the discharge pipeline; the concentrated liquid total discharge pipeline, the dilute liquid total discharge pipeline and the discharge pipeline are all connected to a total discharge pipeline.

8. The system for automatic acid-base titration according to claim 7, characterized in that: The concentrated acid storage tank is connected to a concentrated acid cleaning pipeline, and a concentrated acid cleaning valve is arranged on the concentrated acid cleaning pipeline; the concentrated alkali storage tank is connected to a concentrated alkali cleaning pipeline, and a concentrated alkali cleaning valve is arranged on the concentrated alkali cleaning pipeline; the concentrated acid cleaning pipeline and the concentrated alkali cleaning pipeline are connected to a total cleaning pipeline, and a total cleaning valve is arranged on the total cleaning pipeline; the PH tank to be adjusted is connected to a PH tank to be adjusted cleaning pipeline, and a PH tank to be adjusted cleaning valve is arranged on the PH tank to be adjusted cleaning pipeline; the total cleaning pipeline and the PH tank to be adjusted cleaning pipeline are both connected to the total water replenishment pipeline.

9. The system for automatic acid-base titration according to claim 1, characterized in that: The stirrer of the pH tank to be adjusted is a magnetic stirrer.

10. The system for automatic acid-base titration according to claim 3, characterized in that: The concentrated acid storage tank is provided with a first liquid level indicator, the concentrated alkali storage tank is provided with a second liquid level indicator, the dilute acid storage tank is provided with a third liquid level indicator, and the dilute alkali storage tank is provided with a fourth liquid level indicator; the pH tank to be adjusted is provided with a high liquid level alarm sensor, a low liquid level alarm sensor and a pH probe.

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