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A low-temperature enrichment and thermal desorption integrated cold trap for trace volatile organic compounds

A volatile organic compound, low-temperature enrichment technology, used in machines/engines, condensation traps/cold partitions, liquefaction, etc., can solve problems such as water vapor freezing, block pipelines, etc. The effect of saving volume

Inactive Publication Date: 2019-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The temperature of the dehumidification trap should not be too low. If the temperature is too low, the water vapor will freeze and block the pipeline.

Method used

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  • A low-temperature enrichment and thermal desorption integrated cold trap for trace volatile organic compounds

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Embodiment Construction

[0018] In conjunction with the accompanying drawings of the device, we describe the specific implementation of the device of the present invention as follows:

[0019] The integrated cold trap for low-temperature enrichment and thermal analysis of trace organic matter in the present invention is characterized in that it includes a refrigeration system, a gas sample dehumidification system, a cold trap enrichment system and a thermal analysis system. The refrigeration system includes a refrigerator and a granular heat transfer medium; the dehumidification system includes a dehumidification pipe, a catheter and a liquid storage tank; the enrichment system includes an adsorbent, glass wool, and a gas sample adsorption glass tube; the thermal analysis system includes an electric heating wire and vacuum interlayer.

[0020] Before sample analysis, the refrigerator is first powered, the refrigerator starts to work, and the experiment starts when the temperature required for the expe...

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Abstract

The invention discloses a low-temperature enrichment and thermal desorption integrated cold trap for trace volatile organic compounds. The cold trap is characterized by comprising a refrigeration system, a gas sample dehumidification system, a cold trap enrichment system and a thermal desorption system. A sample water vapor dehumidification trap and a trapping trap are integrally designed, so thatthe size and the cost are reduced. The cold trap is small in design size, free of refrigerant consumption, capable of continuously working for a long time, capable of being used as a pretreatment device for in-situ continuous monitoring and wide in application range.

Description

technical field [0001] The present invention designs a low-temperature enrichment and thermal analysis integrated cold trap for trace volatile organic compounds, which can perform low-temperature enrichment-high-temperature analysis for trace substances in the atmosphere that cannot be directly detected by instruments, and use carrier gas to blow back into the mass spectrometer The analysis and detection belongs to a pre-processing device. It plays an important role in improving the high sensitivity of on-site rapid detection instruments for trace volatile organic compounds in ambient air. Background technique [0002] Volatile organic compounds (VOCs) are a class of organic compounds that are volatile at normal temperature and pressure, mainly including alkanes, alkenes and aromatic hydrocarbons, as well as other oxygen-containing hydrocarbons, halogenated hydrocarbons, nitrogen-containing and sulfur-containing hydrocarbons, etc., which have certain potential harm. Under ...

Claims

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Application Information

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IPC IPC(8): B01D8/00G01N1/44G01N1/42G01N1/40
Inventor 侯可勇韩笑笑李海洋李金旭陈平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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