JP7356830B2 - Intermediate processing equipment for gas chromatographs and gas chromatographs - Google Patents

Description

The present invention relates to an intermediate treatment device used in a post-column reaction gas chromatograph and a post-column reaction gas chromatograph.

Conventionally, an apparatus called a "post-column reaction gas chromatograph" is known as an apparatus for measuring the concentration of a gas to be measured. A post-column reactive gas chromatograph converts a component to be measured contained in a sample gas into a gas such as methane, and measures the concentration of each component to be measured based on the concentration of the converted methane.
The post-column reaction gas chromatograph described above consists of a column that separates the target components, an intermediate treatment device that converts each target component after separation into methane, and a device that measures the concentration of methane (for example, a flame ionization detector). (Flame Ionization Detector, FID)). The intermediate treatment device includes an oxidation catalyst that oxidizes the component to be measured, and a reduction catalyst that reduces the component oxidized by the oxidation catalyst to methane.

In a post-column reactive gas chromatograph (hereinafter referred to as a gas chromatograph), the sample gas flows from the column to an intermediate treatment device, and from the intermediate treatment device to a device that measures the concentration of methane.

Japanese Patent Application Publication No. 2016-156819

The catalyst used in the intermediate treatment device of the post-column reaction gas chromatograph has conventionally been supported on diatomaceous earth or alumina carriers. Since the alumina support has a relatively flat surface, the catalyst supported on the alumina support may be stripped off by the gas flow during use. Furthermore, since the surface area of the catalyst is small, there are few reaction sites with the component to be measured, making it difficult to obtain a sufficient catalytic reaction.
On the other hand, since diatomaceous earth has no heat resistance and low strength, the carrier (diatomaceous earth) sometimes cracks under high-temperature conditions for catalytic reactions.

Therefore, an object of the present invention is to suppress a decrease in the oxidation ability of a catalyst in an intermediate treatment device for a post-column reaction gas chromatograph.

A plurality of aspects will be described below as means for solving the problem. These aspects can be arbitrarily combined as necessary.
An intermediate processing device for a gas chromatograph according to one aspect of the present invention includes a gas pipe and a filling member. A component to be measured contained in the sample gas flows through the gas pipe. The filling member is connected to the gas pipe and is filled with a catalyst carrier carrying an oxidation catalyst that oxidizes the component to be measured. Further, the oxidation catalyst is supported at least inside or outside the porous structure of the catalyst carrier.
Thereby, it is possible to suppress the oxidation catalyst from peeling off from the catalyst carrier. As a result, it is possible to suppress a decrease in the oxidizing ability of the catalyst.

The intermediate treatment device for gas chromatograph may further include a reduction catalyst. The reduction catalyst reduces the components oxidized by the oxidation catalyst to generate a predetermined derivative. Thereby, in the gas chromatograph, the concentration of the component to be measured can be measured based on the concentration of the predetermined derivative.

The oxidation catalyst may be heated to a temperature of 400°C or more and 600°C or less. Thereby, the reaction by the oxidation catalyst can be promoted.

The intermediate processing device for a gas chromatograph may further include a joint. The joint connects the gas passage port of the filling member and the gas pipe. This joint has a first pressing part, a second pressing part, and a sealing member. The first pressing portion is provided at the passage port. The second pressing portion is provided at a portion of the gas pipe that connects to the passage port. The sealing member is a plate-shaped member, and seals between the first pressing part and the second pressing part by being pressed by the first pressing part and the second pressing part. Therefore, even if the metal catalyst is heated, it is possible to separate the first pressing part and the second pressing part that constitute the joint. This facilitates catalyst replacement.

The first surface of the first pressing part that presses the sealing member and the second surface of the second pressing part that presses the sealing member may be mirror-finished. Thereby, the passage port of the filling member and the gas pipe of the intermediate processing device can be well sealed.

The joint may include a first fastening member and a second fastening member. The first fastening member is provided on the passage port side. The second fastening member is provided on the gas pipe side and can be screwed into the first fastening member. At this time, the first pressing portion and the second pressing portion press the sealing member due to the tightening force generated when the second fastening member is screwed into the first fastening member. Thereby, the structure in which the sealing member is pressed by the first pressing part and the second pressing part can be simplified.

A gas chromatograph according to another aspect of the present invention includes a column, an intermediate treatment device, and an analysis device. The column separates the sample gas into components to be measured. The intermediate processing device converts each component to be measured derived from the column into a predetermined derivative. The analyzer analyzes the component to be measured based on the concentration of the predetermined derivative derived from the intermediate processing device.
The intermediate processing device described above includes a gas pipe and a filling member. A component to be measured contained in the sample gas flows through the gas pipe. The filling member is connected to the gas pipe and is filled with a catalyst carrier carrying an oxidation catalyst that oxidizes the component to be measured. At this time, the oxidation catalyst is supported at least either inside or outside of the porous structure of the catalyst carrier.
Thereby, it is possible to suppress the oxidation catalyst from peeling off from the catalyst carrier. As a result, it is possible to suppress a decrease in the oxidizing ability of the catalyst.

In the above intermediate treatment device, it is possible to suppress a decrease in the oxidation ability of the oxidation catalyst.

FIG. 1 is a diagram showing the overall configuration of a gas chromatograph apparatus according to a first embodiment. The figure which shows the structure of an intermediate processing device. FIG. 3 is a diagram showing the configuration of an analysis device. The figure which shows the specific structure of a joint. FIG. 3 is a diagram showing the state of a joint when connecting a gas pipe and an inlet/outlet.

1. First Embodiment (1) Gas Chromatograph A gas chromatograph 100 according to a first embodiment will be described below with reference to FIG. FIG. 1 is a diagram showing the overall configuration of a gas chromatograph according to a first embodiment.
The gas chromatograph 100 separates each component to be measured contained in the sample gas, converts the component to be measured into a predetermined derivative, and detects the concentration of this derivative, thereby determining the component to be measured contained in the sample gas. This is a device that measures concentration.

Regarding the emission regulations of VOC (volatile organic compounds), analysis using the gas chromatograph 100 is performed. Here, in order to convert the electrical signal related to the component to be measured in the gas chromatograph 100 into a concentration value, a standard gas or a standard solution with a known concentration is required. The gas chromatograph 100 allows concentration values of such standard gases or standard solutions to be determined. Volatile organic compounds are, for example, hydrocarbons such as hexane (C ₆ H ₁₄ ), pinene (C ₁₀ H ₁₆ ), and alcohols such as methanol (CH ₃ OH). Other volatile organic compounds include toluene, benzene, fluorocarbons, dichloromethane, and the like.

In the gas chromatograph 100 according to the first embodiment, an intermediate processing device 3, which will be described later, converts these measurement target components into a standard substance (for example, methane (CH ₄ )). Further, an analyzer 5, which will be described later, measures the concentration of the standard substance after conversion, and measures the concentration of the component to be measured from the measurement result. Thereby, the gas chromatograph 100 can measure the concentrations of many types of components to be measured using only the calibration curve of the standard substance. In other words, the gas chromatograph 100 can simultaneously ensure traceability for many types of components to be measured.

As shown in FIG. 1, the gas chromatograph 100 includes a column 1, an intermediate treatment device 3, and an analysis device 5.
The column 1 separates the sample gas pumped from a pump or other pumping device 11 into components to be measured, and guides the sample gas to the first gas pipe L1. The column 1 is placed in a constant temperature bath 13 such as an oven and maintained at a high temperature. Column 1 is, for example, a capillary column whose inner wall is coated with a stationary phase. As the stationary phase used in the column 1, any known stationary phase can be used as appropriate, depending on the type of component to be measured.

The intermediate processing device 3 is arranged downstream of the column 1 and upstream of the analyzer 5 when considering the upstream and downstream sides of the sample gas. Specifically, the intermediate processing device 3 is connected to the column 1 via the first gas pipe L1, and to the analyzer 5 via the second gas pipe L2. The intermediate processing device 3 converts each component to be measured led to the first gas pipe L1 into a predetermined derivative. Specifically, the intermediate processing device 3 oxidizes the component to be measured to generate a predetermined intermediate, and reduces the intermediate to generate a predetermined derivative. The intermediate is, for example, carbon dioxide (CO ₂ ). The intermediate processing device 3 leads out the gas containing the predetermined derivative to the second gas pipe L2. A derivative is, for example, methane (CH ₄ ).

The analysis device 5 is connected to the intermediate processing device 3 via the second gas pipe L2. The analyzer 5 measures the concentration of the component to be measured based on the concentration of a predetermined derivative contained in the gas led out to the second gas pipe L2.

(2) Intermediate Processing Device Next, the specific configuration of the intermediate processing device 3 included in the gas chromatograph 100 according to the first embodiment will be described using FIG. 2. FIG. 2 is a diagram showing the configuration of the intermediate processing device. The intermediate processing device 3 is a device that converts the component to be measured derived from the column 1 into a predetermined derivative. The intermediate treatment device 3 mainly includes an oxidation catalyst 31 and a reduction catalyst 33.

The oxidation catalyst 31 is a catalyst that promotes an oxidation reaction. The oxidation catalyst 31 is, for example, a metal catalyst made of a metal with a high valence such as palladium (Pd) or platinum (Pt). The oxidation catalyst 31 oxidizes components to be measured, such as hydrocarbons and alcohols, and promotes a reaction that generates carbon monoxide (CO), carbon dioxide (CO ₂ ), and the like as intermediates. Note that the oxidation catalyst 31 is supported on a catalyst carrier. The catalyst carrier supporting the oxidation catalyst 31 is filled into a filling member 31a, which is a cylindrical member with a small diameter.

A first passage port 31b is provided at one end of the filling member 31a, and a second passage port 31c is provided at the other end. The first passage port 31b is an inlet for gas into the filling member 31a. The second passage port 31c is an outlet for gas from inside the filling member 31a. The first passage port 31b is connected to the first gas pipe L1 by a joint 35. On the other hand, the second passage port 31c is connected to the fourth gas pipe L4.

The first gas pipe L1 is connected to the first flow rate adjustment device 37a via the third gas pipe L3. The first flow rate adjusting device 37a is connected to the oxidizing gas supply section G1, adjusts the flow rate of the oxidizing gas supplied from the oxidizing gas supply section G1, and introduces the oxidizing gas into the first gas pipe L1. The first flow rate adjustment device 37a is, for example, a flow rate adjustment device such as a mass flow controller (MFC). The oxidizing gas supply unit G1 is, for example, a cylinder filled with a gas containing oxygen such as air.

The filling member 31a can be heated by the first heating device 41. The first heating device 41 heats the filling member 31a to heat the oxidation catalyst 31 to a temperature that promotes the oxidation reaction and prevents condensation of moisture generated by the oxidation reaction. The heating temperature of the oxidation catalyst 31 is, for example, 100°C or more and 1000°C. Preferably, the heating temperature of the oxidation catalyst 31 is, for example, 400°C or more and 600°C or less. More preferably, the heating temperature of the oxidation catalyst 31 is, for example, 600°C.

The reduction catalyst 33 is a catalyst that promotes the reduction reaction. The reduction catalyst 33 is a metal catalyst made of, for example, nickel, ruthenium, or rhodium. The reduction catalyst 33 promotes a reaction that reduces the intermediate and generates, for example, methane (CH ₄ ) as a derivative. Note that the reduction catalyst 33 is supported on a catalyst carrier. The catalyst carrier carrying the reduction catalyst 33 is filled into a filling member 33a, which is a cylindrical member with a small diameter.

A third passage port 33b is provided at one end of the filling member 33a, and a fourth passage port 33c is provided at the other end. The third passage port 33b is an inlet for gas into the filling member 33a. The fourth passage port 33c is an outlet for gas from inside the filling member 33a. The third passage port 33b is connected to the fifth gas pipe L5 by a joint 35. On the other hand, the fourth passage port 33c is connected to the sixth gas pipe L6 through a joint 35.

The fifth gas pipe L5 is connected to the fourth gas pipe L4 via the gas flow path switching section 39. Further, the fourth gas pipe L4 is connected to the second flow rate adjustment device 37b via the seventh gas pipe L7. The second flow rate adjustment device 37b is connected to the reducing gas supply section G2, adjusts the flow rate of the reducing gas supplied from the reducing gas supply section G2, and introduces it into the fourth gas pipe L4. The second flow rate adjustment device 37b is, for example, a flow rate adjustment device such as a mass flow controller (MFC). The reducing gas supply unit G2 is, for example, a cylinder filled with hydrogen gas.

The filling member 33a can be heated by a second heating device 43. The second heating device 43 heats the filling member 33a to heat the reduction catalyst 33 to a temperature that promotes the reduction reaction and prevents condensation of moisture generated by the reduction reaction. The heating temperature of the reduction catalyst 33 is, for example, 100°C or more and 1000°C or less. Preferably, the heating temperature of the reduction catalyst 33 is, for example, 400°C or more and 600°C or less. More preferably, the heating temperature of the reduction catalyst 33 is, for example, 600°C.

The intermediate processing device 3 of this embodiment further includes a control section 45. The control unit 45 is a computer system including a CPU, a storage device (RAM, ROM, SSD, hard disk, etc.), various interfaces (for example, an A/D converter, a D/A converter), etc. The first flow rate adjustment device 37a, the second flow rate adjustment device 37b, the first heating device 41, and the second heating device 43) are controlled. Alternatively, the control unit 45 may be realized by an SoC having the above configuration.
Further, the above functions of the control unit 45 are realized by a program stored in a storage device. In addition, part or all of the functions of the control unit 45 may be realized as hardware.

The intermediate processing device 3 of this embodiment further includes a gas flow path switching section 39. The gas flow path switching unit 39 switches between a gas flow path in which the intermediate passes through the reduction catalyst 33 and a gas flow path in which the intermediate does not pass through the reduction catalyst 33 .
The gas flow path switching unit 39 connects the fourth gas pipe L4 to the fifth gas pipe L5 and connects the sixth gas pipe L6 to the second gas pipe L2, so that the gas flow path switching unit 39 connects the fourth gas pipe L4 to the fifth gas pipe L5 and connects the sixth gas pipe L6 to the second gas pipe L2. Form a flow path. On the other hand, the gas flow path switching unit 39 forms a gas flow path in which the intermediate does not pass through the reduction catalyst 33 by connecting the fourth gas pipe L4 to the second gas pipe L2.

That is, the gas flow path switching unit 39 switches between introducing the derivative generated by reducing the intermediate by the reduction catalyst 33 into the analyzer 5, or directly introducing the intermediate into the analyzer 5. Thereby, the signal output from the FID device 51 when the intermediate is introduced can be used as a background signal (signal when the component to be measured is not present) for measuring the concentration of the component to be measured.

(3) Analyzer Next, the specific configuration of the analyzer 5 included in the gas chromatograph 100 according to the first embodiment will be described using FIG. 3. FIG. 3 is a diagram showing the configuration of the analyzer.
The analyzer 5 is a device that measures the concentration of the component to be measured contained in the sample gas based on the concentration of the derivative generated in the intermediate processing device 3. The analysis device 5 includes an FID device 51 and a calculation device 53.

The FID device 51 is connected to the intermediate processing device 3 via the second gas pipe L2. The FID device 51 detects a derivative contained in the gas led out from the intermediate processing device 3 to the second gas pipe L2. The FID device 51 is, for example, a flame ionization detector (FID).
More specifically, the FID device 51 flows the gas led out to the second gas pipe L2 into a hydrogen flame, which is a combustion flame, and measures the ionization current generated by the ionization in the hydrogen flame, thereby determining the amount of gas contained in the gas. The derivative (methane (CH ₄ )) is detected.

The arithmetic device 53 is a computer system including a CPU, a storage device (RAM, ROM, SSD, hard disk, etc.), various interfaces (eg, A/D converter, D/A converter), and the like. Alternatively, the arithmetic device 53 may be realized by an SoC having the above configuration. The functions of the arithmetic unit 53 described below are realized by a program stored in a storage device. In addition, part or all of the functions of the arithmetic device 53 may be realized as hardware.
The calculation device 53 controls the FID device 51, calculates the concentration of the derivative from the ionization current value measured by the FID device 51, and measures the concentration of the component to be measured in the sample gas based on the concentration of the derivative. .

(4) Joint Hereinafter, using FIG. 4 and FIG. The specific configuration of the joint 35 that connects the gas pipe of the processing device 3 will be explained. FIG. 4 is a diagram showing a specific configuration of the joint. FIG. 5 is a diagram showing the state of the joint when connecting the gas pipe and the inlet/outlet.
Below, the joint 35 used to connect the first passage port 31b and the first gas pipe L1 will be described as an example. Joints 35 at other locations also have similar configurations. The joint 35 mainly includes a first pressing part 35a, a second pressing part 35b, and a sealing member 35c.

The first pressing portion 35a is a metal flange-shaped member provided at the tip of the first passage port 31b. The first surface 35a' of the first pressing portion 35a that comes into contact with the sealing member 35c is mirror-finished. This improves the sealing performance between the first pressing portion 35a and the sealing member 35c.
The second pressing portion 35b is a metal flange-shaped member provided at the tip of the first gas pipe L1. That is, the second pressing portion 35b is provided at a portion of the first gas pipe L1 that connects to the first passage port 31b. The second surface 35b' of the second pressing portion 35b that comes into contact with the sealing member 35c is mirror-finished. This improves the sealing performance between the second pressing portion 35b and the sealing member 35c.

The sealing member 35c is a plate-shaped metal member, and has a ring shape in which openings corresponding to the first gas pipe L1 and the first passage port 31b are formed. The sealing member 35c is arranged between the first pressing part 35a and the second pressing part 35b, and seals between the first pressing part 35a and the second pressing part 35b.

The joint 35 includes a first fastening member 35d and a second fastening member 35e. The first fastening member 35d is a screw member that has an opening through which the first passage port 31b passes, and has a thread formed at its tip. The second fastening member 35e is a nut member that has an opening through which the first gas pipe L1 passes and can be screwed into the thread of the first fastening member 35d.

As shown in FIG. 5, when the first fastening member 35d and the second fastening member 35e are screwed together, the tip of the first fastening member 35d is connected to the third surface 35a'' (in the first pressing part 35a, the first surface 35a'). On the other hand, when the first fastening member 35d and the second fastening member 35e are screwed together, the base end portion of the second fastening member 35e is connected to the fourth surface 35b'' (in the second pressing portion 35b, the second surface 35b' (on the opposite side). Due to the tightening force generated when the second fastening member 35e and the first fastening member 35d are screwed together, the first pressing part 35a is pushed in the direction of the second pressing part 35b, and the second pressing part 35b is pushed into the first pressing part 35b. It is pushed in the direction of 35a. As a result, the first pressing section 35a and the second pressing section 35b press the sealing member 35c disposed therebetween.

By connecting the catalyst and the gas pipe using the joint 35 configured as described above, in the intermediate treatment device 3 according to the present embodiment, the joint 35 heated as the catalyst is heated can be connected to the gas inlet/outlet of the catalyst and the gas pipe. It is possible to prevent this from becoming impossible to remove from the . That is, in the intermediate treatment device 3 according to the present embodiment, the catalyst can be easily removed from the gas pipe, so that the catalyst can be easily replaced after use.

In the intermediate processing apparatus 3 of this embodiment, the gas contacting part (sealing member 35c) of the joint 35, the filling member, the gas passage port, and the gas piping do not generate the intermediates and derivatives such as silver or nickel. Preferably, it is made of a material. This is because if intermediates and derivatives are generated in these members, errors will occur in the measurement results in the analyzer 5.

(5) Oxidation Catalyst The oxidation catalyst 31 that oxidizes the component to be measured in the intermediate treatment device 3 will be described in more detail below. As described above, the oxidation catalyst 31 of this embodiment is a metal catalyst made of a metal with a high valence such as palladium (Pd) or platinum (Pt), for example. The oxidation catalyst 31, which is a metal catalyst, is supported on a catalyst carrier.
In this embodiment, the catalyst carrier is, for example, silica (SiO ₂ ) powder having a porous structure. The catalyst carrier of this embodiment made of silica has higher heat resistance than conventional carriers. That is, the oxidation catalyst 31 of this embodiment is not easily damaged by cracking even when heated to, for example, about 600°C. As a result, for example, it is possible to reduce the possibility that the metal catalyst supported on the porous structure is exposed to a large gas flow and peeled off from the catalyst carrier. In addition, conventional catalyst carriers had large lot-to-lot variations, but by forming the catalyst carriers from silica, lot-to-lot variations in catalyst carriers can be reduced. As a result, it is possible to suppress variations in the oxidation ability of the oxidation catalyst 31 between lots.

As described above, the oxidation catalyst 31 is a metal catalyst with a high valence such as palladium (Pd) or platinum (Pt), for example. The oxidation catalyst 31, which is a metal catalyst, is supported at least inside or outside the porous structure of the catalyst carrier. The metal catalyst is supported on the catalyst carrier, for example, by introducing the catalyst carrier into an acidic solution in which the metal constituting the oxidation catalyst 31 is dissolved and impregnating the catalyst carrier, and then drying the catalyst carrier. In addition, the oxidation catalyst 31 may be supported on the catalyst carrier by introducing the catalyst carrier into a solution of a metal salt constituting the oxidation catalyst 31 to impregnate it, and then drying the catalyst carrier (calcining if necessary). You can also do it.
In this way, the oxidation catalyst 31 that promotes the oxidation reaction is supported at least either inside or outside of the porous structure of the catalyst carrier, so that when the component to be measured and the oxidizing gas are passed through, the oxidation catalyst 31 is Peeling from the catalyst carrier can be suppressed.

By having the characteristics of the catalyst carrier and the metal catalyst described above, it is possible to suppress the oxidation ability of the oxidation catalyst 31 of this embodiment from decreasing.

2. Other Embodiments Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention. In particular, the multiple embodiments and modifications described in this specification can be arbitrarily combined as necessary.
(A) In the intermediate treatment device 3, a cylindrical member filled with a reactant is provided in the gas flow path between the filling member 31a for the oxidation catalyst 31 and the filling member 33a for the reduction catalyst 33. Good too. This reactant reacts with chlorine gas (Cl ₂ ) and sulfur oxides (for example, sulfur dioxide (SO ₂ )) contained in the gas discharged from the filling member 31a, and removes them.

For example, if the component to be measured contains elemental chlorine or elemental sulfur, the oxidation catalyst 31 may add chlorine gas or sulfur oxide as a sub-agent in addition to carbon dioxide or carbon monoxide when the component to be measured is oxidized. Occurs as a product. When these byproducts are reduced by the reduction catalyst 33, they are reduced to generate hydrogen chloride (HCl) and sulfuric acid (H ₂ SO ₄ ).
Therefore, by disposing the above-mentioned reactant between the filling member 31a for the oxidation catalyst 31 and the filling member 33a for the reduction catalyst 33, hydrogen chloride (HCl) contained in the gas led out from the filling member 31a can be removed. ) and sulfuric acid (H ₂ SO ₄ ) can be reduced. As a result, it is possible to prevent a large amount of these acidic substances from flowing into the analysis device 5 (FID device 51).

For example, silver (Ag) can be used as the above-mentioned reactant. When silver is used as a reactant, chlorine gas reacts with silver to generate silver chloride, thereby making it possible to remove chlorine gas from the gas discharged from the filling member 31a. Further, sulfur dioxide reacts with silver to generate silver sulfide (Ag ₂ S) and oxygen, so that sulfur dioxide can be removed from the gas discharged from the filling member 31a.

INDUSTRIAL APPLICATION This invention is widely applicable to the intermediate processing apparatus used for a post-column reaction gas chromatograph, and a post-column reaction gas chromatograph.

100 Gas chromatograph 1 Column 11 Pressure feeding device 13 Constant temperature bath 3 Intermediate treatment device 31 Oxidation catalyst 33 Reduction catalyst 31a, 33a packing member 31b First passage port 31c Second passage port 33b Third passage port 33c Fourth passage port 35 Joint 35a 1 pressing part 35a' 1st surface 35a'' 3rd surface 35b 2nd pressing part 35b' 2nd surface 35b'' 4th surface 35c Sealing member 35d 1st fastening member 35e 2nd fastening member 37a 1st flow rate adjustment device 37b Second flow rate adjustment device 39 Gas flow switching unit 41 First heating device 43 Second heating device 45 Control unit L1 First gas piping L2 Second gas piping L3 Third gas piping L4 Fourth gas piping L5 Fifth gas piping L6 Sixth gas pipe L7 Seventh gas pipe 5 Analyzer 51 FID device 53 Arithmetic device G1 Oxidizing gas supply section G2 Reducing gas supply section

Claims (6)

A gas pipe through which a component to be measured contained in the sample gas flows;
a filling member connected to the gas pipe and filled with a catalyst carrier supporting an oxidation catalyst that oxidizes the component to be measured;
a joint that connects the gas passage port of the filling member and the gas pipe;
Equipped with
The oxidation catalyst is supported at least either inside or outside of the porous structure of the catalyst carrier,
The said joint is
a first pressing portion having a flange shape provided at the passage port;
a second pressing portion having a flange shape provided at a connecting portion of the gas pipe to the passage port;
A plate-shaped member disposed between the flange-shaped portion of the first pressing portion and the flange-shaped portion of the second pressing portion, and the flange-shaped portion of the first pressing portion and the flange-shaped portion of the second pressing portion. a sealing member that seals between the first pressing part and the second pressing part by being pressed by the flange-shaped part ;
the sealing member is made of nickel or silver;
Intermediate processing equipment for gas chromatographs. The intermediate processing device for a gas chromatograph according to claim 1, further comprising a reduction catalyst that reduces the component oxidized by the oxidation catalyst to generate a predetermined derivative. The intermediate processing device for a gas chromatograph according to claim 1 or 2, wherein the oxidation catalyst is heated to a temperature of 400°C or higher and 600°C or lower. Any one of claims 1 to 3, wherein a first surface of the first pressing part that presses the sealing member and a second surface of the second pressing part that presses the sealing member are mirror-finished. An intermediate processing device for the gas chromatograph described above. The joint includes a first fastening member provided on the passage port side, and a second fastening member provided on the gas pipe side and capable of being screwed into the first fastening member,
Any one of claims 1 to 4, wherein the first pressing part and the second pressing part press the sealing member by a tightening force generated when the second fastening member is screwed into the first fastening member. An intermediate processing device for the gas chromatograph described above. A column that separates the sample gas into each component to be measured,
an intermediate processing device that converts each component to be measured derived from the column into a predetermined derivative;
an analysis device that analyzes the component to be measured based on the concentration of the predetermined derivative derived from the intermediate processing device;
Equipped with
The intermediate processing device is
A gas pipe through which a component to be measured contained in the sample gas flows;
a filling member connected to the gas pipe and filled with a catalyst carrier supporting an oxidation catalyst that oxidizes the component to be measured;
a joint that connects the gas passage port of the filling member and the gas pipe;
Equipped with
The oxidation catalyst is supported at least either inside or outside of the porous structure of the catalyst carrier,
The said joint is
a first pressing portion having a flange shape provided at the passage port;
a second pressing portion having a flange shape provided at a connecting portion of the gas pipe to the passage port;
A plate-shaped member disposed between the flange-shaped portion of the first pressing portion and the flange-shaped portion of the second pressing portion, and the flange-shaped portion of the first pressing portion and the flange-shaped portion of the second pressing portion. a sealing member that seals between the first pressing part and the second pressing part by being pressed by the flange-shaped part ;
the sealing member is made of nickel or silver;
Gas chromatograph.

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