JPS5920675Y2 - Pyrolysis device for gas chromatograph - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pyrolysis device for gas chroma I graph.

More specifically, in a type of pyrolysis equipment that is equipped with a switching cock through which an operating rod for sample introduction can be passed between the sample introduction port and the pyrolysis furnace, there is a through hole through which the operating rod can be passed through the switching cock, and a through hole for introducing a standard sample. The present invention relates to a pyrolysis device for a gas chromatograph, which is provided with a through hole through which an injection needle can pass, and a septum made of silicone rubber or the like is provided at one end of the latter through hole.

The pyrolysis device is connected to a gas chromatograph and is used for pyrolysis analysis such as identification and structural analysis of polymeric substances.

However, all conventional pyrolysis apparatuses have had problems in identifying the material obtained after pyrolysis.

In other words, in order to perform identification, it is necessary to analyze a standard sample using exactly the same column and flow path as used during pyrolysis of the sample, but conventional pyrolysis equipment does not take this into account. Because the standard sample could not be introduced into the pyrolysis equipment, it was impossible to use the same flow path.

Therefore, we removed the pyrolysis device from the gas chromatograph and introduced the standard sample directly into the gas chromatograph.
Alternatively, identification has been carried out by analyzing a standard sample under the same conditions as possible using another gas chroma I graph with the same type of column and similar flow path configuration.

However, these methods inevitably differ from the flow path during thermal decomposition of the sample, so they have the disadvantage of causing many errors.

It is an object of the present invention to overcome the above-mentioned conventional drawbacks and to provide a pyrolysis apparatus that can analyze a standard sample using exactly the same column and flow path as used for the pyrolysis analysis of the sample.

The main structural feature is that a switching cock is provided between the sample introduction port of the pyrolysis equipment and the pyrolysis furnace, and the switching cock has a through hole through which an operating rod for introducing the sample is passed, and a syringe needle for introducing the standard sample. A through-hole is provided through which the material can be passed through, and a septum made of silicone rubber or the like is provided at one end of the latter through-hole.

In the first position of the switching cock, the operating rod can be passed through the former through hole, and the sample can be introduced into the pyrolysis furnace from the sample inlet.

In the second position of the switching cock, the septum separates the sample inlet from the pyrolysis furnace.

However, since it is possible to insert a syringe needle into the septum,
Through the latter through-hole through the septum, the standard sample can be introduced into the pyrolysis furnace through the sample inlet.

Therefore, the standard sample can be analyzed using the same column and flow path used for the thermal decomposition analysis of the sample, and the problems associated with conventional methods of identification do not occur.

A more detailed explanation will be given below based on the embodiment shown in the figures.

An embodiment of a pyrolysis apparatus 1 according to this invention is shown in FIGS. 1 and 2.

Sample introduction port 2. A pyrolysis furnace 3 and a heat insulating block 4 are arranged in this order, and are connected to a heat insulating block, a chromatographic column, and an outlet.

A switching port is provided between the sample introduction port 2 and the pyrolysis furnace 3, and a carrier gas introduction pipe 7 is connected between the switching port and the pyrolysis furnace 3.

In the first position of the switching point, the through hole 8 through which the sample introduction operation rod 9 of the switching point can be passed communicates the sample introduction port 2 with the pyrolysis furnace 3.

The sample S is then introduced into the pyrolysis furnace 3 using the operating rod 9.

The sample vaporized in the pyrolysis furnace 3 is transferred to the carrier gas introduction pipe 7
It is introduced into the gas chromatograph by the inflowing carrier gas.

Now, if the operating rod 9 is pulled out to the left in FIG. 1 and the switching lever 10 is rotated 90 degrees, the switching lever will be switched to the second position.

As shown in the horizontal cross section of FIG. 3, the conventional switching switch a was provided with only a through hole 8a through which the operating rod 9 for introducing the sample could pass. Although the pyrolysis furnace 3 was shut off, the standard sample could not be injected.

However, the switching device according to this invention is provided with a through hole 11 through which an injection needle for introducing a standard sample can pass, and a septum 12 made of a rubber material such as silicone rubber is provided at one end of the through hole 11.

Therefore, the septum 12 connects the sample inlet 2 and the pyrolysis furnace 3.
In addition, if a syringe is used, the injection needle can be inserted into the pyrolysis furnace 3 through the septum 12 from the sample introduction port 2, making it easy to introduce the standard sample into the pyrolysis furnace 3. can be done.

In this way, in the pyrolysis apparatus 1, the standard sample can be analyzed using the same column and flow path as in the pyrolysis analysis of the sample, so the accuracy of identification in the pyrolysis analysis is significantly improved.

Not only this, but also in terms of operation, there is an advantage that the complicated work required in the conventional method is not required.

In addition, in the above embodiment, the switching point is spherical and has a diameter of 90 mm.
Although the description has been made assuming that the switch is switched by rotating the angle of 90°, the present invention is not limited to this.
Alternatively, the switching may be performed by rotating the .

In addition, a through hole through which an operating rod for sample introduction can pass and a through hole through which an injection needle can go are provided in parallel in a rectangular block, and a septum made of silicone rubber or the like is installed at one end of the latter through hole, and the block is slid. It may be possible to switch.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the pyrolysis device according to this invention, Fig. 2 is a horizontal sectional view of the switching cock, and Fig. 3 is a horizontal sectional view of the switching cock.
The figure is a horizontal sectional view of a conventional switching cock. 1...Pyrolysis device, 2...Sample introduction port, 3...Pyrolysis furnace, 6...Switching cock, 8... Through hole through which the operating rod passes, 11...
...Through hole through which the injection needle passes, 12... Septum, 13... Stopper.

Claims (1)

[Scope of utility model registration request] In a type of pyrolysis apparatus that is equipped with a switching cock between the sample introduction port and the pyrolysis furnace through which an operating rod for introducing the sample can be passed, the switching cock has a through hole through which the operating rod can be passed and a syringe needle for introducing the standard sample can be passed through. A pyrolysis device for a gas chromatograph, characterized in that a through hole is provided, and a septum made of silicone rubber or the like is provided at one end of the latter through hole.