Butadiene gas phase sampling system

Abstract

The utility model relates to the technical field of gas chromatographic analysis, in particular to a butadiene gas phase sample injection system which comprises a sampling steel cylinder, the outlet end of the sampling steel cylinder is connected with a pressure-resistant bottle through a connecting pipe I, the outlet end of the pressure-resistant bottle is connected with a chromatograph through a connecting pipe II, a heating jacket is arranged at the bottom of the pressure-resistant bottle, and the heating jacket is connected with the chromatograph through a connecting pipe II. A sampling valve is arranged at the outlet end of the sampling steel cylinder, and a sample injection valve is arranged on the second connecting pipe. According to the utility model, the chromatographic instrument and the pressure-resistant bottle are hermetically connected together by adopting the connecting pipe, and butadiene in the pressure-resistant bottle can automatically enter the chromatographic instrument when the sample injection valve is opened, so that the phenomenon that the sample injection pipe is blocked by chippings of a sealing gasket due to the fact that a side through needle penetrates through the sealing gasket for sample injection is avoided, and meanwhile, the risk of butadiene leakage caused by the fact that the sealing gasket is punctured for multiple times is also prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of gas chromatography analysis, in particular to a butadiene gas phase injection system. Background Art

[0002] In the field of chemical production, butadiene is a multifunctional chemical raw material, which is widely used in synthetic rubber, plastics, chemicals and energy production. When butadiene enters the factory as a chemical raw material, the chemical analysis of butadiene is indispensable. The inspection of raw materials requires inspection personnel to supervise sampling and chemical analysis. Butadiene is the main raw material for production, so chemical inspection and analysis is an indispensable task.

[0003] Nowadays, when analyzing butadiene, inspectors usually introduce the butadiene sampled from the sampling cylinder into a pressure-resistant vial, and then use a side pass needle to insert it into the pressure-resistant vial and the sealing cap of the chromatographic injection port. The compressed butadiene in the pressure-resistant vial enters the chromatographic quantitative loop for chemical analysis due to its own pressure. The current inspection and analysis method of butadiene has the following disadvantages: 1. The gas phase of butadiene in the pressure-resistant vial enters the chromatographic quantitative loop for replacement, and its component content is determined after complete replacement. As butadiene enters the chromatographic quantitative loop, the pressure in the pressure-resistant vial gradually decreases, and the unstable injection pressure causes deviations in the test results; 2. The side pass needle will bring the debris that passes through the sealing gasket into the injection tube every time the sample is injected, and the injection tube is at risk of being blocked; 3. There are many links through the connection during the analysis process. The side pass needle connection is too simple and the sealing gasket is easy to be punctured when the analysis frequency is high, resulting in butadiene leaking easily from the connection. Butadiene is carcinogenic. Once leaked, it will endanger the health of the inspectors. Utility Model Content

[0004] In order to solve the deficiencies in the prior art, the utility model provides a butadiene gas phase injection system.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is: a butadiene gas phase injection system, including a sampling steel cylinder, the outlet end of the sampling steel cylinder is connected to a pressure-resistant bottle through a connecting pipe 1, the outlet end of the pressure-resistant bottle is connected to a chromatograph through a connecting pipe 2, a heating jacket is provided at the bottom of the pressure-resistant bottle, a sampling valve is provided on the outlet end of the sampling steel cylinder, and an injection valve is provided on the connecting pipe 2.

[0006] Furthermore, a pressure sensor is also provided on the connecting pipe 2.

[0007] Furthermore, the pressure sensor is arranged between the pressure-resistant bottle and the injection valve.

[0008] Furthermore, the heating jacket is arranged in a control device, and the control device is electrically connected to the pressure sensor and the injection valve.

[0009] Furthermore, the control device is provided with a display screen, a heating switch for controlling the heating of the heating jacket, and an injection switch for controlling the injection of the injection valve.

[0010] Furthermore, a sample inlet is provided at the connection point between the pressure-resistant bottle and the first connecting tube; and a sample outlet is provided at the connection point between the pressure-resistant bottle and the second connecting tube.

[0011] The beneficial effects achieved by the utility model are:

[0012] 1. The utility model adopts a connecting tube to seal and connect the chromatograph with the pressure-resistant bottle. When the injection valve is opened, the butadiene in the pressure-resistant bottle will automatically enter the chromatograph, avoiding the use of a side needle to penetrate the sealing gasket for injection so that the sealing gasket debris blocks the injection tube, and also preventing the risk of butadiene leakage caused by the sealing gasket being punctured multiple times.

[0013] 2. The utility model is provided with a pressure sensor on the second connecting pipe, and the temperature of the heating jacket is controlled by the pressure value fed back by the pressure sensor, so that the pressure of butadiene in the pressure-resistant bottle is maintained at a certain value, the injection pressure of butadiene is maintained, and the butadiene analysis work is convenient and accurate.

[0014] 3. The pressure-resistant bottle of the utility model is provided with an inlet and an outlet. The inlet can be quickly and tightly connected to the connecting tube 1, so that the butadiene in the sampling cylinder can be quickly injected into the pressure-resistant bottle in a closed state. The outlet can be quickly and tightly connected to the connecting tube 2, so that the butadiene in the pressure-resistant bottle can be injected into the chromatograph without leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Explanation of the markings in the figure: 1. Sampling cylinder; 2. Sampling valve; 3. Connecting pipe 1; 4. Inlet; 5. Pressure bottle; 6. Sample outlet; 7. Connecting pipe 2; 8. Pressure sensor; 9. Injection valve; 10. Chromatograph; 11. Control device; 12. Heating jacket; 13. Display screen; 14. Heating switch; 15. Injection switch. DETAILED DESCRIPTION

[0017] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a butadiene gas phase injection system of the utility model in conjunction with the accompanying drawings.

[0018] like Figure 1As shown, a butadiene gas phase injection system includes a sampling cylinder 1, the outlet end of the sampling cylinder 1 is connected to a connecting pipe 3, the other end of the connecting pipe 3 is connected to a pressure-resistant bottle 5, a sampling valve 2 is arranged on the outlet end of the sampling cylinder 1, the sampling valve 2 controls the butadiene in the sampling cylinder 1 to enter the pressure-resistant bottle 5, the outlet end of the pressure-resistant bottle 5 is connected to a connecting pipe 2 7, the other end of the connecting pipe 2 7 is connected to the feed port of a chromatograph 10, a pressure sensor 8 and an injection valve 9 are respectively arranged on the connecting pipe 2 7, the pressure sensor 8 is arranged between the injection valve 9 and the pressure-resistant bottle 5, the pressure sensor 8 is used to detect the pressure of butadiene in the connecting pipe 2 7, and then detect the pressure of butadiene in the pressure-resistant bottle 5, and the injection valve 9 controls the butadiene in the pressure-resistant bottle 5 to enter the chromatograph 10.

[0019] A sample inlet 4 is provided at the connection between the pressure-resistant bottle 5 and the connecting tube 1 3, and the sample inlet 4 can be quickly and sealedly connected to the connecting tube 1 3, so that the butadiene in the sampling cylinder 1 can be quickly injected into the pressure-resistant bottle 5 in a closed state; a sample outlet 6 is provided at the connection between the pressure-resistant bottle 5 and the connecting tube 2 7, and the sample outlet 6 can be quickly and sealedly connected to the connecting tube 2 7, so that the butadiene in the pressure-resistant bottle 5 can be injected into the chromatograph 10 without leakage. The setting of the sample inlet 4 and the sample outlet 6 facilitates the quick connection between the connecting tube and the pressure-resistant bottle 5, which ensures the sealing performance while improving the connection efficiency between the various devices in the system.

[0020] A heating jacket 12 is provided at the bottom of the pressure-resistant bottle 5. The heating jacket 12 can increase the temperature of butadiene in the pressure-resistant bottle 5, thereby increasing the pressure in the pressure-resistant bottle 5. The heating jacket 12 is provided in a control device 11. The control device 11 is electrically connected to the pressure sensor 8 and the injection valve 9 respectively. A display screen 13, a heating switch 14 and an injection switch 15 are provided on the side wall of the control device 11. The display screen 13 can instantly display the pressure in the connecting pipe 27. The injection switch 15 controls the opening and closing of the injection valve 9. The heating switch 14 is provided with multiple temperature gears. The heating switch 14 controls the temperature of the heating jacket 12 and thereby controls the pressure of butadiene in the pressure-resistant bottle 5. The inspector can control the temperature of the heating jacket 12 according to the pressure value fed back by the pressure sensor 8, so that the pressure of butadiene in the pressure-resistant bottle 5 is maintained at a certain value, the injection pressure of butadiene is maintained, and the butadiene analysis work is convenient and accurate.

[0021] When in use, the inspector opens the sampling valve 2 and flushes the butadiene in the sampling cylinder 1 into the pressure-resistant bottle 5. After the butadiene in the pressure-resistant bottle 5 is completely flushed, the sampling valve 2 is closed and the injection switch 15 is controlled to open the injection valve 9, so that the butadiene gas in the pressure-resistant bottle 5 enters the chromatograph 10. At this time, the display screen 13 displays the pressure in the connecting pipe 2 7 detected by the pressure sensor 8. The staff chooses whether to turn on the heating switch 14 according to the pressure indication on the display screen 13. When the pressure sensor 8 on the connecting pipe 2 7 detects that the injection pressure is insufficient, the inspector turns on the heating switch 14 to heat the pressure-resistant bottle 5, accelerates the volatilization of butadiene, increases the gas phase pressure, stabilizes the butadiene gas phase injection, and reduces the inspection error. After the replacement is completed, the injection valve 9 is closed to start the chromatographic analysis.

[0022] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A butadiene gas phase injection system, characterized in that: The invention comprises a sampling steel cylinder (1), wherein the outlet end of the sampling steel cylinder (1) is connected to a pressure-resistant bottle (5) via a connecting pipe 1 (3), the outlet end of the pressure-resistant bottle (5) is connected to a chromatograph (10) via a connecting pipe 2 (7), a heating jacket (12) is arranged at the bottom of the pressure-resistant bottle (5), a sampling valve (2) is arranged on the outlet end of the sampling steel cylinder (1), and an injection valve (9) is arranged on the connecting pipe 2 (7).

2. A butadiene gas phase injection system according to claim 1, characterized in that: The second connecting pipe (7) is also provided with a pressure sensor (8).

3. A butadiene gas phase injection system according to claim 2, characterized in that: The pressure sensor (8) is arranged between the pressure-resistant bottle (5) and the injection valve (9).

4. A butadiene gas phase injection system according to claim 2, characterized in that: The heating jacket (12) is arranged in a control device (11), and the control device (11) is electrically connected to the pressure sensor (8) and the injection valve (9).

5. A butadiene gas phase injection system according to claim 4, characterized in that: The control device (11) is provided with a display screen (13), a heating switch (14) for controlling the heating of the heating jacket (12), and an injection switch (15) for controlling the injection of the injection valve (9).

6. A butadiene gas phase injection system according to claim 1, characterized in that: A sample inlet (4) is provided at the connection point between the pressure-resistant bottle (5) and the first connecting pipe (3); and a sample outlet (6) is provided at the connection point between the pressure-resistant bottle (5) and the second connecting pipe (7).

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