A gas chromatograph detector

Abstract

The invention discloses a gas chromatography detector, which comprises components such as a heating block, a gas pipe, a reference filler, a temperature measuring element, a catalyst filler, a heat insulating layer, a cavity, and a signal processing system. Using air as the carrier gas and make-up gas, the effluent of the chromatographic system is driven by the carrier gas to quickly pass through the reference packing and the catalyst packing in sequence. The catalytic combustion of the effluent releases heat to increase the temperature of the catalyst packing, and the temperature change is converted by the temperature measuring element. output as an electrical signal. The detector can be used to construct a general-purpose detector or a selective detector by changing the chemical properties of the catalyst filler. The detector has the characteristics of high sensitivity and fast response, and can be used for the detection of volatile organic compounds and combustible inorganic gases.

Description

technical field

[0001] The invention relates to the field of measurement and detection, in particular to a gas chromatography detector based on the principle of catalytic combustion, which can be used for the detection of volatile organic compounds and combustible inorganic gases. Background technique

[0002] The gas chromatographic detector is the key device of the gas chromatograph, which directly determines the important analytical performance such as the sensitivity and linear range of the gas chromatographic analysis. Currently, commonly used gas chromatographic detectors include thermal conductivity cell detector (TCD), electron capture detector (ECD), flame ionization detector (FID), flame photometric detector (FPD) and flame thermionic detector (FTD). )wait.

[0003] TCD usually uses hydrogen and helium as carrier gas, while FID and FPD use hydrogen, nitrogen, argon or helium as carrier gas, hydrogen as combustion gas, air or oxygen as supporting gas. ECD typicall...

Examples

Embodiment 1

[0024] Assemble a gas chromatograph detector such as figure 1 As shown in (a), consists of heating block (12), gas pipe (4), reference packing (6), first temperature measuring element (10), second temperature measuring element (11), catalyst packing (8) , a first heat insulating layer (5), a second heat insulating layer (7), a cavity (1), and a signal processing system; the cavity (1) is a cylindrical structure, and the side wall of the cylindrical structure has a The interface on the side wall is connected to the makeup gas line (3), one end of the cylinder is sealed and has an interface to connect to the gas chromatography column (2), and the other end of the cylinder is open to connect to the gas line pipe (4), the gas chromatography column ( 2) It is coaxial and communicated with the gas pipeline (4), and the gas pipeline (4) is filled with the first heat insulation layer (5), the reference filler (6), the second heat insulation layer (1) from one end of the cavity (1) La...

Embodiment 2

[0027] like figure 1 As shown in (b), on the basis of the gas chromatographic detector described in Embodiment 1, the gas line pipe 4 is respectively provided with openings in the two packing areas, and the wires of the first temperature measuring element 10 and the second temperature measuring element 11 are respectively Lead out from two openings, and seal and fix with sealant 13, and sealant 13 selects inorganic glue.

Embodiment 3

[0029] On the basis of the gas chromatographic detector described in Example 1, the catalyst packing 8 is changed to gold-loaded titanium dioxide particles, with a loading of 35 mg, wherein the gold loading is 10% (w / w), and the detector is used for 130 ℃ selective detection of methanol.

technical field

[0001] The invention relates to the field of measurement and detection, in particular to a gas chromatography detector based on the principle of catalytic combustion, which can be used for the detection of volatile organic compounds and combustible inorganic gases. Background technique

[0002] The gas chromatographic detector is the key device of the gas chromatograph, which directly determines the important analytical performance such as the sensitivity and linear range of the gas chromatographic analysis. Currently, commonly used gas chromatographic detectors include thermal conductivity cell detector (TCD), electron capture detector (ECD), flame ionization detector (FID), flame photometric detector (FPD) and flame thermionic detector (FTD). )wait.

[0003] TCD usually uses hydrogen and helium as carrier gas, while FID and FPD use hydrogen, nitrogen, argon or helium as carrier gas, hydrogen as combustion gas, air or oxygen as supporting gas. ECD typicall...

Examples

Embodiment 1

[0024] Assemble a gas chromatograph detector such as figure 1 As shown in (a), consists of heating block (12), gas pipe (4), reference packing (6), first temperature measuring element (10), second temperature measuring element (11), catalyst packing (8) , a first heat insulating layer (5), a second heat insulating layer (7), a cavity (1), and a signal processing system; the cavity (1) is a cylindrical structure, and the side wall of the cylindrical structure has a The interface on the side wall is connected to the makeup gas line (3), one end of the cylinder is sealed and has an interface to connect to the gas chromatography column (2), and the other end of the cylinder is open to connect to the gas line pipe (4), the gas chromatography column ( 2) It is coaxial and communicated with the gas pipeline (4), and the gas pipeline (4) is filled with the first heat insulation layer (5), the reference filler (6), the second heat insulation layer (1) from one end of the cavity (1) La...

Embodiment 2

[0027] like figure 1 As shown in (b), on the basis of the gas chromatographic detector described in Embodiment 1, the gas line pipe 4 is respectively provided with openings in the two packing areas, and the wires of the first temperature measuring element 10 and the second temperature measuring element 11 are respectively Lead out from two openings, and seal and fix with sealant 13, and sealant 13 selects inorganic glue.

Embodiment 3

[0029] On the basis of the gas chromatographic detector described in Example 1, the catalyst packing 8 is changed to gold-loaded titanium dioxide particles, with a loading of 35 mg, wherein the gold loading is 10% (w / w), and the detector is used for 130 ℃ selective detection of methanol.

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