Full two-dimensional gas chromatograph modulator based on semiconductor heating and cooling technique

Abstract

The invention provides a full two-dimensional gas chromatograph modulator based on a semiconductor heating and cooling technique. The full two-dimensional gas chromatograph modulator comprises a refrigeration system, a heating system and a control system. The refrigeration system and the heating system are respectively connected to the control system. The refrigeration system comprises a heat radiating device, a refrigeration sheet, a first heat insulating pad and a cold conduction block. The heat radiating device, the first heat insulating pad and the cold conduction block are orderly laminated tightly. The refrigeration sheet is installed in the first heat insulating pad. The heating system comprises a heater, a second heat insulating pad and a heat conduction block. The second heat insulating pad and the heat conduction block are closely laminated. The heater is installed in the second heat insulating pad. The modulator has a simple structure, is easy to control and install and can effectively save the experimental cost and the laboratory space.

Description

technical field [0001] The invention relates to the technical field of analytical instruments and equipment, in particular to a comprehensive two-dimensional gas chromatography modulator based on semiconductor heating and cooling technology. Background technique [0002] As a separation tool, gas chromatography has played an important role in the analysis of volatile and semi-volatile compounds. At present, most gas chromatography instruments are one-dimensional gas chromatography, which uses a column, which is only suitable for ~ Sample analysis of hundreds of substances. With the increasing complexity of samples and the continuous improvement of separation and analysis requirements, conventional gas chromatography can no longer meet the needs of analysis work, and the development and application of multidimensional chromatography technology is particularly necessary. Comprehensive Two-dimensional Gas Chromatography (GC×GC) is a separation technology developed in the 1990s...

AI Technical Summary

Problems solved by technology

[0004] However, this four-nozzle modulator usually uses liquid nitrogen as the cold source, and it is necessary to provide a path of high-purity nitrogen flowing through the cold source for cold spraying, and a path of heated air for thermal spraying. The structure of the instrument is complex and takes up a large experimental space. and cold spray gas consume a lot, increase the cost of the experiment, and are not easy to operate and maintain

In addition, this modulation technique is not ideal for the modulation of small molecular components with low boiling points

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