CN203658300U - Tester for determining scale inhibitor performance by using conductivity method - Google Patents

Abstract

The utility model specifically discloses a test device for measuring the performance of scale inhibitors by using the conductivity method, which includes an evaluation and measurement pool; There is an airtight rubber plug with four holes, and the temperature sensor, conductivity electrode, liquid inlet pipe and gas inlet and outlet pipe are respectively inserted into the four holes; the conductivity electrode is connected with the conductivity recorder; The liquid pipe is connected with the titrant container, and a constant flow peristaltic pump is arranged on the connecting pipe. Evaluate the effective airtightness of the measuring cell to prevent the titrant from being affected by carbon dioxide in the air during the measurement process. The equipment is relatively compact, the connection is relatively stable, and it is not easy to knock over the glass container.

Description

A test device for measuring the performance of scale inhibitors by using the conductivity method

technical field

The utility model relates to a test device for quickly evaluating the performance of a scale inhibitor by using an electric conductivity method, in particular to a test device for quickly measuring the performance of a scale inhibitor by using a conductivity monitoring and recording instrument.

Background technique

Use the conductivity method to quickly evaluate the performance of scale inhibitors. The instruments used include conductivity meters, timing instruments, constant temperature devices, constant stirring devices, volumetric flasks, burettes, pipettes, evaluation and measurement pools, etc. The operation process is as follows: a certain dose of CaCl ₂ and the scale inhibitor to be tested are installed in the evaluation and measurement pool, stirred at a constant temperature, and the titrant Na ₂ CO ₃ is dripped into the evaluation and measurement pool through an alkaline burette; timed by a stopwatch, and recorded by a conductivity meter. ; With the addition of titrant, the conductivity increases. When the amount of titrant added reaches a certain value, the conductivity value suddenly drops. Record the titrant dose and calculate the supersaturation of the solution to evaluate different scale inhibition under the same conditions. Antiscalant performance of the agent.

In the actual operation process, there are mainly the following disadvantages:

1. The evaluation and measurement pool cannot be effectively sealed, and the solution is easy to absorb carbon dioxide in the air, which will have a certain impact on the test results;

2. Sodium carbonate standard solution is manually added dropwise with a burette, and the human error is relatively large;

3. After each drop, the time is controlled by a timing instrument, and the relative error is relatively large;

4. The titrant container is open. When the test time is long, the titrant is easily affected by carbon dioxide in the air;

5. The connection of each equipment is not stable, and it is easy to knock over and break the glass container.

Utility model content

In order to effectively solve the above problems, the utility model provides a test device for quickly evaluating the performance of scale inhibitors by using the conductivity method, which can simply and quickly evaluate the scale inhibition performance of scale inhibitors.

In order to achieve the above object, the utility model adopts the following technical solutions:

A test device for measuring the performance of scale inhibitors by using the conductivity method, including an evaluation and measurement pool; the bottom of the evaluation and measurement pool is provided with a constant temperature magnetic stirrer for stirring the solution, and the top of the evaluation and measurement pool is provided with a An airtight rubber plug for sealing it, and four holes are arranged on the airtight rubber plug; a temperature sensor, a conductance electrode, a liquid inlet pipe and an air inlet and outlet pipe are respectively inserted into the four holes; the conductance electrode and the The conductivity recorder used to detect the conductivity of the solution is connected; the liquid inlet pipe is connected to the titrant container through a connecting pipe, and a constant current peristaltic pump for controlling the amount of liquid feeding is arranged on the connecting pipe.

The constant temperature electromagnetic stirrer includes a stirring magnet, and the stirring magnet is arranged in the evaluation and measurement cell.

An air isolation device is arranged in front of the titrant container, and the titrant container communicates with the air isolation device through a connecting pipe.

The constant-current peristaltic pump is connected with a start-stop switch.

The temperature sensor is connected with a constant temperature magnetic stirrer.

The evaluation measuring pool, which is used to hold the prepared CaCl ₂ and the scale inhibitor to be tested; the titrant container, which is used to place 0.10mol/LNa ₂ CO ₃ ; the constant flow peristaltic pump, There is a one-button start-stop switch on it, which controls the amount of _Na2CO3 in the titrant container and the reaction time together with the timing instrument; the constant temperature magnetic stirrer is used to stir _the solution in the evaluation and measurement pool; The conductivity recorder described above is used for detecting, evaluating and measuring the conductivity of the solution in the pool. The air insulation device is a sealed container.

The working process of the present utility model is as follows:

Put a certain dose of CaCl ₂ and the scale inhibitor to be tested into the evaluation and measurement pool, and stir at a constant temperature. The Na ₂ CO ₃ in the titrant container is sent into the evaluation and measurement pool through a constant current peristaltic pump, and the real-time conductivity is recorded by the conductivity recorder. rate; with the addition of titrant, the conductivity increases. When the amount of titrant added reaches a certain value, the conductivity value drops suddenly. Antiscalant performance of the scale agent.

The beneficial effects of the utility model are:

1. Evaluate the effective airtightness of the measurement cell to avoid the titrant being affected by carbon dioxide in the air during the measurement process;

2. The sodium carbonate titrant is added dropwise by a constant speed peristaltic pump, which reduces the error of human operation;

3. The data of the conductivity recorder can be read, stored and processed by the conductivity, which reduces the error caused by timing;

4. An air isolation device is installed in front of the titrant container, which effectively avoids the titrant being affected by carbon dioxide in the air;

5. The equipment is relatively compact, the connection is relatively stable, and it is not easy to knock down the glass container.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model;

Fig. 2 is the top view of the rubber stopper of the present utility model;

In the figure: 1. Air isolation device; 2. Titrant container; 3. Peristaltic pump; 4. Temperature-controlled magnetic stirrer; 5. Conductivity recorder; Rubber plug; 9. Temperature sensor; 10. Conductivity electrode; 11. Liquid inlet pipe; 12. Air inlet and outlet pipe; 13. Titrant liquid inlet pipe; 14. Start-stop switch;

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Figures 1 and 2: the test device for measuring the performance of antiscalants using conductivity monitoring and recording instruments, including:

The evaluation and measurement pool 7, as a reaction vessel, is a pool with a volume of 250mL, which holds standard liquid and antiscalant, and is provided with a closed rubber stopper 8 with four holes, the middle one is placed with a conductivity electrode, and there are three holes around it. , respectively place the titrant Na ₂ CO ₃ inlet pipe, temperature sensor (thermocouple), inlet and outlet pipes (the measurement process is airtight).

The constant-current peristaltic pump 3 is equipped with a one-button start-stop switch 14, which controls the liquid intake and reaction time according to the timing instrument; the relationship between its rotational speed and flow rate should be calibrated and measured before the evaluation test. The titrant should be added at an appropriate speed. If it is too fast, the data of the conductivity recorder will be unstable and cannot truly reflect the conductivity value in the evaluation cell. If it is too slow, the evaluation and measurement time will be too long, prolonging the evaluation time, and the titrant Susceptible to outside air. A constant flow peristaltic pump 3 and a timing instrument are used to control the amount of liquid entering and the reaction time.

The conductivity recorder 5 needs to pass the measurement verification, and the accuracy is 0.01??s/cm, and the recorded data can be read by a computer and other equipment.

Constant temperature electromagnetic stirrer 4, with stirring magnet and temperature sensor (thermocouple), adjustable temperature and stirring speed; with heating function, temperature control accuracy ± 1 ℃.

Air isolation device 1, 0.1mol/L sodium hydroxide is placed inside the device to absorb carbon dioxide in the air.

The titrant container 2 holds the titrant Na ₂ CO ₃ , and pumps the titrant into the evaluation and measurement pool through a constant-flow peristaltic pump. In order to prevent the titrant from being affected by carbon dioxide in the air, an air isolation device is installed in front of the titrant container.

Stirring magnet 6, used for stirring the solution and mixing evenly;

The temperature sensor 9 (thermocouple) is used together with the temperature control magnetic stirrer to detect and control the temperature of the reaction solution;

The conductivity electrode 10 is used to detect the conductivity of the solution together with the conductivity recorder;

Liquid inlet pipe 11, for adding titrant;

Inlet and outlet trachea 12, which is sealed during evaluation and measurement;

The titrant inlet pipe 13 draws the titrant from the titrant container and feeds it into the evaluation and measurement pool at a constant speed through a peristaltic pump; the connecting pipe 15 is used to connect the air isolation device and the titrant container.

The specific working process is as follows:

1. After cleaning all parts of the device for rapid evaluation of antiscalant performance by conductivity method, connect them from left to right and from bottom to top as shown in the device diagram;

2. Put an appropriate amount of 0.1mol/L sodium hydroxide solution in the air isolation device;

3. Fill the titrant container with an appropriate amount of 0.10mol/L Na ₂ CO ₃ titrant;

4. Use a stopwatch to calibrate the relationship between the flow rate and time of the constant speed peristaltic pump and determine the appropriate speed;

5. Take 3.0mL of CaCl ₂ solution (0.10mol/L) and a certain dose of scale inhibitor, and dilute to 100mL with desalinated water. Pour the prepared solution into the evaluation and measurement pool and seal it;

6. Turn on the constant temperature magnetic stirrer, set the temperature and stirring speed, until the set temperature is constant;

7. Turn on the constant speed peristaltic pump, start timing when the first drop appears in the titrant inlet pipe, and observe the readings of the conductivity recorder;

8. With the addition of titrant, the reading of the conductivity recorder increases. When the amount of titrant added reaches a certain value, the conductivity value suddenly drops, record the titration time, and turn off the constant speed peristaltic pump;

9. Calculate the dose of titrant and calculate the supersaturation of the solution;

10. Clean the device for rapid evaluation of scale inhibitor performance by conductivity method, and repeat steps 5-9 to evaluate the scale inhibition performance of different scale inhibitors under the same conditions.

Claims (5)

1. A test device utilizing conductivity method to measure antiscalant performance, comprising evaluation and measurement pool; it is characterized in that: the bottom of described evaluation and measurement pool is provided with a constant temperature magnetic stirrer that stirs solution, and the evaluation and measurement pool An airtight rubber plug is provided on the top for sealing it, and four holes are arranged on the airtight rubber plug; a temperature sensor, a conductivity electrode, a liquid inlet pipe, and an air inlet and outlet pipe are respectively inserted into the four holes; The conductivity electrode is connected to a conductivity recorder for detecting the conductivity of the solution; the liquid inlet pipe is connected to the titrant container through a connecting pipe, and a constant current peristaltic device for controlling the amount of liquid inlet is provided on the connecting pipe. Pump. 2. test device as claimed in claim 1, is characterized in that: described constant temperature electromagnetic stirrer comprises stirring magnet, and described stirring magnet is arranged in the evaluation measuring cell. 3. The test device according to claim 1, characterized in that: an air isolation device is arranged in front of the described titrant container, and the described titrant container communicates with the air isolation device through a connecting pipe. 4. test device as claimed in claim 1, is characterized in that: described constant current peristaltic pump links to each other with start-stop switch. 5. test device as claimed in claim 1, is characterized in that: described temperature sensor links to each other with constant temperature magnetic stirrer.

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