Interface between directly-heated metal capillary chromatography column and gas chromatograph

A technology of capillary chromatographic column and gas chromatograph, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as electron capture detectors and hydrogen flame ionization detectors of some manufacturers that cannot work normally, and achieve functional The effect of low consumption, small heat capacity and easy installation

Active Publication Date: 2008-12-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some problems when the direct resistance heating device of the metal capillary column is connected with the commercialized gas chromatograph: (1) due to the voltage applied to both ends of the chromatographic column, there must be good electrical insulation between the chromatographic column and the chromatograph; (2) The direct insertion of metal chromatographic columns into some types of detectors will cause the detectors to not work normally, such as electron capture detectors and hydrogen flame ionization detectors of some manufacturers; (3) the inlet and detector of the chromatograph have A few centimeters of column joints are exposed in the chromatographic oven. When using a metal capillary column direct resistance heating device, this column joint forms a cold zone.

Method used

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  • Interface between directly-heated metal capillary chromatography column and gas chromatograph
  • Interface between directly-heated metal capillary chromatography column and gas chromatograph
  • Interface between directly-heated metal capillary chromatography column and gas chromatograph

Examples

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Effect test

Embodiment 1

[0020] see figure 1 As shown, the present invention is a schematic diagram of the interface structure used to connect the metal capillary chromatographic column to the Agilent 6890N gas chromatograph inlet / detector.

[0021] This interface connects one end of the metal capillary column with a section of fused silica capillary column through a micro two-way 100. The micro two-way 100 is made of metal material and sealed with a metal ferrule 103 to ensure good electrical contact. In the micro two-way 100 There are upper and lower high temperature resistant insulating sleeves 200 and 300 respectively at the upper and lower ends of the upper and lower ends. made of insulating material. A section of spring-shaped metal wire 400 is clamped between the miniature two-way and its lower end high-temperature-resistant insulating sleeve 300 to act as an electrode lead 401 for heating voltage on the chromatographic column. The high temperature resistant insulating sleeve 200 on the upper...

Embodiment 2

[0025] For the present invention figure 1 The shape of the upper high-temperature-resistant insulating sleeve 200 is slightly modified, and the top of the upper high-temperature-resistant insulating sleeve 200 is set as a columnar groove 204, so that it can be screwed with the column joint screw of the inlet / detector of the Varian 3800 gas chromatograph. The cap is adapted, and the interface of the invention can be used for the connection between the metal capillary chromatographic column and the Varian 3800 gas chromatograph inlet / detector.

[0026] The interface between direct heating metal capillary chromatographic column and Varian 3800 gas chromatograph, the interface is a cylindrical structure, including micro two-way 100, upper high temperature resistant insulating sleeve 200, lower high temperature resistant insulating sleeve 300, thin-walled metal sleeve 500, heating wire 600 and insulation layer 700,

[0027] The insulation layer 700 is sleeved on the outer side of ...

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Abstract

The invention relates to an interface for connecting a directly-heated metal capillary chromatography column or a quartz capillary chromatographic column with a quartz capillary drip. The interface essentially comprises a micro two-way, a high temperature insulation sleeve, a thin wall metal sleeve, an electrically heated wire, an insulation layer, an electrode leader, a temperature sensor and a temperature controller. The device connects the directly-heated metal capillary chromatography column or the quartz capillary chromatographic column with a section of quartz capillary through the micro two-way. The section of quartz capillary is inserted in an injection port or a detector of a gas chromatography. The electrically heated wire is externally winded on the thin wall metal sleeve to heat the micro two-way in constant temperature. The interface solves both the electrical insulation problem for the connection between the directly-heated metal capillary chromatography column and the gas chromatography and the interface cold region produced due to the fact that the heat capacity of the joint is far larger than the chromatography column. The device has the advantages of simplicity, convenient installation and low power consumption.

Description

technical field [0001] The invention relates to an interface connecting a metal capillary chromatographic column or a quartz capillary column with a quartz capillary introduction tube. The interface is used for direct heating and rapid temperature rise of the metal capillary gas chromatographic column by using direct resistance heating technology, and the chromatographic column and commercial gas chromatograph Galvanic isolation of inlet and detector and no cold zone connection. The invention is also applicable to the connection between the quartz capillary chromatographic column and the leading empty capillary in the direct heating chromatographic column heating device. Background technique [0002] The direct resistance heating technology can realize the rapid temperature program of the gas chromatographic column, and the heating rate can reach up to 20 ℃ / s. The direct resistance heating technology using metal capillary gas chromatography column is to directly apply a cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 许峰关亚风观文娜
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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