An apparatus for preparing hydrogen chloride gas in nitrogen

Abstract

This utility model discloses an apparatus for preparing hydrogen chloride gas in nitrogen, relating to the technical field of gas preparation devices. It includes: an intermediate gas cylinder, with a mixing pipeline connected to its outlet and a first valve on the mixing pipeline; a nitrogen cylinder, with a nitrogen pipeline connected to its outlet and a second valve on the nitrogen pipeline; and a target gas cylinder, with a precision balance positioned below it, a gas delivery pipeline connected to its inlet, a third valve on the gas delivery pipeline, a gas purifier connected to the end of the gas delivery pipeline furthest from the target gas cylinder, a conveying pipeline connected to the end of the gas purifier furthest from the target gas cylinder, and a fourth valve on the end of the conveying pipeline furthest from the gas purifier. The apparatus for preparing hydrogen chloride gas in nitrogen disclosed in this utility model can achieve precise and efficient preparation of hydrogen chloride gas in nitrogen.

Description

Technical Field

[0001] This utility model relates to the field of gas preparation device technology, and more specifically to a device for preparing hydrogen chloride gas in nitrogen. Background Technology

[0002] Currently, the main methods for preparing gaseous reference materials include the partial pressure method, injection method, and weighing method. The partial pressure method is based on Dalton's law of partial pressures, calculating the sum of the partial pressures of each component gas to determine the total pressure of the mixture, thus obtaining the content of each component. However, the partial pressure method is complex and requires sophisticated equipment. Leaks or inaccurate pressure readings in manifolds, pressure gauges, valves, vacuum pumps, etc., can lead to deviations in the gas mixing ratio. While the injection method avoids the waste of manpower and resources caused by multiple dilutions and saves production costs, it requires highly sensitive instruments for analysis, resulting in significant investment and high production costs, hindering its widespread application. The weighing method directly determines the content of each component by accurately weighing the gas. As long as the balance is sufficiently accurate and the weighing operation is performed correctly, high-precision values ​​can be obtained. Compared to other methods that rely on indirect measurements such as pressure and volume, it has a wide range of applications, is relatively simple to operate, does not require complex pressure and flow control systems, and does not require tedious calculations to correct gas state equations, making it easy to promote and apply in different laboratories and production sites.

[0003] However, when using traditional gas preparation devices to prepare hydrogen chloride gas in nitrogen, the presence of trace amounts of moisture and other impurities in the gas results in corrosive hydrogen chloride gas with low concentrations, affecting the stability and lifespan of the gas cylinder. Therefore, providing a more accurate and efficient device for preparing hydrogen chloride gas standard material in nitrogen is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the present invention provides an apparatus for preparing hydrogen chloride gas in nitrogen, which can achieve precise and efficient preparation of hydrogen chloride gas in nitrogen. To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides an apparatus for preparing hydrogen chloride gas in nitrogen, comprising:

[0006] An intermediate gas cylinder contains a mixture of hydrogen chloride gas and nitrogen gas. A mixing pipeline is connected to the outlet of the intermediate gas cylinder, and a first valve is installed on the mixing pipeline.

[0007] A nitrogen cylinder containing nitrogen gas, with a nitrogen pipeline connected to the outlet of the nitrogen cylinder and a second valve installed on the nitrogen pipeline;

[0008] The target gas cylinder has a precision balance installed below it. A gas supply pipeline is connected to the gas inlet of the target gas cylinder. A third valve is installed on the gas supply pipeline. A gas purifier is connected to the end of the gas supply pipeline away from the target gas cylinder. A delivery pipeline is connected to the end of the gas purifier away from the target gas cylinder. A fourth valve is installed at the end of the delivery pipeline away from the gas purifier. A mixing pipeline is connected to and communicates with the delivery pipeline at the end away from the intermediate gas cylinder. A nitrogen pipeline is connected to and communicates with the delivery pipeline at the end away from the nitrogen cylinder.

[0009] Furthermore, it also includes a vacuum pump, the input end of which is connected to a suction pipe, the end of which away from the vacuum pump is connected to and communicates with the end of the delivery pipe near the gas purifier, and a fifth valve is provided on the suction pipe.

[0010] Furthermore, the nitrogen pipeline is connected between the intermediate gas cylinder and the gas purifier.

[0011] Furthermore, a sixth valve is provided between the second valve and the gas purifier, and the sixth valve is located on the delivery pipeline.

[0012] Furthermore, silanization passivation lines are installed in the mixing pipeline, nitrogen pipeline, delivery pipeline, intake pipeline, and supply pipeline.

[0013] Furthermore, a pressure gauge is installed on the delivery pipeline, and the pressure gauge is located between the sixth valve and the intake pipeline.

[0014] Furthermore, a temperature gauge is installed on the delivery pipeline, and the temperature gauge is located between the pressure gauge and the intake pipeline.

[0015] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a device for preparing hydrogen chloride gas in nitrogen. It uses a gas purifier to purify the gas before it enters the target gas cylinder, removes impurities in the gas before it enters the target gas cylinder, improves the accuracy of the quality of the gas filled into the target gas cylinder, reduces errors, and ensures the precise and efficient preparation of hydrogen chloride in nitrogen. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the apparatus for preparing hydrogen chloride gas in nitrogen provided by this utility model.

[0018] In the diagram: 1. Intermediate gas cylinder; 2. First valve; 3. Fourth valve; 4. Second valve; 5. Sixth valve; 6. Pressure gauge; 7. Thermometer; 8. Fifth valve; 9. Vacuum pump; 10. Gas purifier; 11. Third valve; 12. Target gas cylinder; 13. Precision balance; 14. Mixing pipeline; 15. Nitrogen pipeline; 16. Intake pipeline; 17. Delivery pipeline; 18. Gas supply pipeline. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] See Figure 1 This utility model discloses an apparatus for preparing hydrogen chloride gas in nitrogen, comprising:

[0021] Intermediate gas cylinder 1 contains a mixture of hydrogen chloride gas and nitrogen gas. A mixing pipeline 14 is connected to the outlet of intermediate gas cylinder 1, and a first valve 2 is installed on the mixing pipeline 14.

[0022] Nitrogen cylinder, which contains nitrogen gas, has a nitrogen pipeline 15 connected to its outlet, and a second valve 4 is installed on the nitrogen pipeline 15.

[0023] The target gas cylinder 12 is equipped with a precision balance 13 below it. A gas supply pipeline 18 is connected to the gas inlet of the target gas cylinder 12. A third valve 11 is installed on the gas supply pipeline 18. A gas purifier 10 is connected to the end of the gas supply pipeline 18 away from the target gas cylinder 12. A delivery pipeline 17 is connected to the end of the gas purifier 10 away from the target gas cylinder 12. A fourth valve 3 is installed at the end of the delivery pipeline 17 away from the gas purifier 10. A mixing pipeline 14 is connected to and communicates with the delivery pipeline 17 at the end away from the intermediate gas cylinder 1. A nitrogen pipeline 15 is connected to and communicates with the delivery pipeline 17 at the end away from the nitrogen cylinder.

[0024] During the preparation process, the third valve 11 and the first valve 2 are opened. The mixed gas in the intermediate gas cylinder 1 enters the delivery pipeline 17 through the mixing pipeline 14, and then enters the gas purifier 10 through the delivery pipeline 17. After purification by the gas purifier 10, the mixed gas enters the target gas cylinder 12 through the gas delivery pipeline 18. The mass of the mixed gas entering the target gas cylinder 12 is weighed by the precision balance 13, and the data of the precision balance 13 is recorded. The first valve 2 is closed, and the second valve 4 is opened. The nitrogen gas in the nitrogen cylinder enters the delivery pipeline 17 through the nitrogen pipeline 15, and then enters the gas purifier 10 through the delivery pipeline 17. After purification by the gas purifier 10, the nitrogen gas enters the gas delivery pipeline 18 and then enters the target gas cylinder 12. The reading of the precision balance 13 is observed. After the predetermined amount of nitrogen gas is introduced, the second valve 4 and the third valve 11 are closed to complete the preparation of hydrogen chloride in nitrogen.

[0025] The gas before entering the target gas cylinder 12 is purified by the gas purifier 10 to remove impurities and ensure the accuracy of the gas mass weighed by the precision balance 13, thereby ensuring the precise preparation of hydrogen chloride gas in nitrogen.

[0026] In some embodiments, a vacuum pump 9 is also included. The input end of the vacuum pump 9 is connected to a suction pipe 16. The end of the suction pipe 16 away from the vacuum pump 9 is connected to and communicates with the end of the delivery pipe 17 near the gas purifier 10. A fifth valve 8 is provided on the suction pipe 16.

[0027] During the preparation process, the first valve 2 and the third valve 11 are opened to introduce the mixed gas into the target gas cylinder 12. Then, the first valve 2 and the third valve 11 are closed, and the fourth valve 3 is opened. The gas in the delivery pipeline 17 is discharged from the preparation device through the fourth valve 3. The fifth valve 8 is opened, and the vacuum pump 9 is started to evacuate the residual gas in the delivery pipeline 17. After the residual gas in the delivery pipeline 17 is evacuated, the vacuum pump 9, the fourth valve 3, and the fifth valve 8 are closed. The third valve 11 and the second valve 4 are opened to introduce nitrogen into the target gas cylinder 12. The third valve 11 and the second valve 4 are closed, and the fifth valve 8, the vacuum pump 9, and the fourth valve 3 are opened again to discharge and evacuate the gas in the delivery pipeline 17 again. This ensures that there is no residual gas in the delivery pipeline 17, that all the gas entering the target gas cylinder 12 is the predetermined gas, and that the precision balance 13 accurately weighs the predetermined gas. This ensures the accuracy of the ratio of the mixed gas to nitrogen, and thus ensures the precise preparation of hydrogen chloride gas in nitrogen.

[0028] In some embodiments, nitrogen line 15 is connected between intermediate gas cylinder 1 and gas purifier 10.

[0029] In some embodiments, a sixth valve 5 is provided between the second valve 4 and the gas purifier 10, and the sixth valve 5 is provided on the delivery pipeline 17.

[0030] The opening and closing of the delivery pipeline 17 are controlled by the sixth valve 5.

[0031] In some embodiments, silanization passivation lines are provided in the mixing line 14, nitrogen line 15, delivery line 17, intake line 16 and delivery line 18.

[0032] By using silanization passivation pipelines to prevent gas from contacting stainless steel pipelines, corrosion is applied to mixing pipeline 14, nitrogen pipeline 15, delivery pipeline 17, intake pipeline 16, and delivery pipeline 18. This prevents the corroded substances from mixing into the gas in delivery pipeline 17, ensuring the purity of the gas entering the target gas cylinder 12, reducing the weighing error of the precision balance 13, and ensuring the accurate preparation of hydrogen chloride gas in nitrogen.

[0033] In some embodiments, a pressure gauge 6 is provided on the delivery pipeline 17, and the pressure gauge 6 is located between the sixth valve 5 and the suction pipeline 16.

[0034] The pressure in the delivery pipeline 17 is measured using pressure gauge 6.

[0035] In some embodiments, a temperature gauge 7 is provided on the delivery pipeline 17, and the temperature gauge 7 is located between the pressure gauge 6 and the intake pipeline 16.

[0036] The temperature inside the delivery pipeline 17 is measured using thermometer 7.

[0037] Preparation of 50 mg / m 3 Examples of standard hydrogen chloride gas in nitrogen:

[0038] The nitrogen cylinder contains nitrogen gas with a concentration of 99.999%, and the intermediate cylinder contains a mixture of hydrogen chloride and nitrogen gas with a concentration of 2000 μmol / mol. The intermediate cylinder 1 uses an 8L aluminum alloy steel cylinder.

[0039] The specific preparation steps are as follows:

[0040] (1) Open the fifth valve 8 and the sixth valve 5, start the vacuum pump 9, and use the vacuum pump 9 to evacuate the gas in the delivery pipeline;

[0041] (2) Place the target gas cylinder 12 on the precision balance 13 and weigh the empty target gas cylinder 12, which is recorded as m0.

[0042] (3) Introduce hydrogen chloride gas into the target gas cylinder 12: Close the fifth valve 8 and the vacuum pump 9, open the first valve 2 and the third valve 11 to allow the gas in the intermediate gas cylinder 1 to enter the target gas cylinder 12. Observe the reading of the precision balance 13. When the gas in the target gas cylinder 12 reaches the required filling mass, close the first valve 2 and the third valve 11, and record the reading of the precision balance 13 as m1. m1-m0 is the mass of the mixed gas in the intermediate gas cylinder 1 that has been filled into the target gas cylinder 12. Open the fourth valve 3 and the fifth valve 8, start the vacuum pump 9, and discharge the residual mixed gas in the delivery pipeline to evacuate the gas in the delivery pipeline.

[0043] (4) Introduce nitrogen into target cylinder 12: Close vacuum pump 9, fourth valve 3, and fifth valve 8; open third valve 11 and second valve 4 to allow nitrogen to enter target cylinder 12. Observe the reading of precision balance 13. When the gas in target cylinder 12 reaches the required filling mass, close second valve 4 and third valve 11, and record the reading of precision balance as m2. m2-m1 is the mass of nitrogen filled into target cylinder 12. Open fourth valve 3 and fifth valve 8, start vacuum pump 9 to expel residual nitrogen in the delivery pipeline, and evacuate the gas in the delivery pipeline to complete the 50mg / m2 filling. 3 Preparation of standard gas of hydrogen chloride in nitrogen.

[0044] In some embodiments, based on the mass of the mixed gas and nitrogen gas filled into the target gas cylinder 12, the concentration of the hydrogen chloride gas standard substance in nitrogen is calculated to be 50 mg / m³. 3 The prepared nitrogen hydrogen chloride gas standard material was analyzed for hydrogen chloride content by Fourier transform infrared spectroscopy. The analysis results were consistent with the calculation results, indicating that the device can accurately prepare nitrogen hydrogen chloride gas standard material.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for preparing hydrogen chloride gas in nitrogen, characterized in that, include: An intermediate gas cylinder contains a mixture of hydrogen chloride gas and nitrogen gas. A mixing pipeline is connected to the outlet of the intermediate gas cylinder, and a first valve is installed on the mixing pipeline. A nitrogen cylinder containing nitrogen gas, with a nitrogen pipeline connected to the outlet of the nitrogen cylinder and a second valve installed on the nitrogen pipeline; The target gas cylinder has a precision balance installed below it. A gas supply pipeline is connected to the gas inlet of the target gas cylinder. A third valve is installed on the gas supply pipeline. A gas purifier is connected to the end of the gas supply pipeline away from the target gas cylinder. A delivery pipeline is connected to the end of the gas purifier away from the target gas cylinder. A fourth valve is installed at the end of the delivery pipeline away from the gas purifier. A mixing pipeline is connected to and communicates with the delivery pipeline at the end away from the intermediate gas cylinder. A nitrogen pipeline is connected to and communicates with the delivery pipeline at the end away from the nitrogen cylinder.

2. The apparatus for preparing hydrogen chloride gas in nitrogen according to claim 1, characterized in that, It also includes a vacuum pump, the input end of which is connected to a suction pipe, the end of which is away from the vacuum pump and connected to the end of the delivery pipe near the gas purifier, and a fifth valve is provided on the suction pipe.

3. The apparatus for preparing hydrogen chloride gas in nitrogen according to claim 1, characterized in that, The nitrogen pipeline is connected between the intermediate gas cylinder and the gas purifier.

4. The apparatus for preparing hydrogen chloride gas in nitrogen according to claim 3, characterized in that, A sixth valve is provided between the second valve and the gas purifier, and the sixth valve is located on the delivery pipeline.

5. The apparatus for preparing hydrogen chloride gas in nitrogen according to claim 2, characterized in that, The mixing pipeline, nitrogen pipeline, delivery pipeline, intake pipeline, and supply pipeline are all equipped with silanization and passivation pipelines.

6. The apparatus for preparing hydrogen chloride gas in nitrogen according to claim 4, characterized in that, A pressure gauge is installed on the delivery pipeline, and the pressure gauge is located between the sixth valve and the intake pipeline.

7. The apparatus for preparing hydrogen chloride gas in nitrogen according to claim 6, characterized in that, A temperature gauge is installed on the delivery pipeline, and the temperature gauge is located between the pressure gauge and the intake pipeline.

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