A high and low temperature control system for gas chromatographic separation

Abstract

The invention discloses a high-low temperature control system for gas chromatography separation. The system comprises a high-low temperature column box, a chromatographic column arranged inside the high-low temperature column box, a chromatographic valve connected with the chromatographic column through a first chromatographic gas pipeline, a chromatographic detector connected with the chromatographic column through a second chromatographic gas pipeline, a self-pressurization liquid nitrogen container connected with the high-low temperature column box through a pair of liquid nitrogen conveying pipes to form a liquid nitrogen circulating loop, low temperature electromagnetic valves arranged on the liquid nitrogen conveying pipes and a temperature control device arranged on the exterior of the high-low temperature column box. Liquid nitrogen is used for controlling the chromatographic column to work under low temperature, a heating device is adopted for enabling the column box to reach the activated temperature for chromatographic column activation, high-low temperature control integration is effectively achieved, the temperature inside the column box is freely switched, and the requirement of the chromatographic column for reliably working under different temperatures is met.

Description

technical field [0001] The invention relates to the technical field of low-temperature gas chromatographic separation, in particular to a high and low temperature control system for gas chromatographic separation. Background technique [0002] Gas chromatography analysis is a very mature separation and analysis method, which plays a very important role in the fields of pharmaceutical analysis, environmental analysis, organic and inorganic chemical analysis, etc. In conventional gas chromatographic analysis, the operating temperature of the chromatographic column is 30°C to 450°C, but for the quantitative analysis of some special gases such as hydrogen isotopes protium, deuterium, and tritium, it needs to work at -196°C to 450°C, and low temperature is used It is used to realize the separation of gases on the chromatographic column, and the high temperature is used for the pretreatment and activation of the chromatographic column. At present, none of the commercially availab...

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Problems solved by technology

[0003] However, this method has low work efficiency, and the additional liquid nitrogen tank does not match the chromatograph, resulting in a large loss of liquid nitrogen.

At the same time, this method is not conducive to the pretreatment and activation of the chromatographic column, and the chromatographic column needs to be disassembled frequently, which is inconvenient for maintenance.

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