Electronic refrigeration atmosphere pre-concentrator

An electronic refrigeration and concentrator technology, applied in the preparation of test samples, etc., can solve the problems that hinder the application of atmospheric pre-concentrators, high noise of liquid nitrogen, high cost, etc., to expand the scope of application, reduce volume and weight, and solve problems The effect of high running costs

Inactive Publication Date: 2015-07-22
李勘
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The biggest disadvantage of the existing atmospheric pre-concentrator is that it needs to be refrigerated with liquid nitrogen. A bottle of liquid nitrogen tank weighs 127 kg and has a large volume, and can only make about 55 samples continuously, even if it is not stored for half a month. The liquid nitrogen is all volatilized, about 600 yuan per bott

Method used

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  • Electronic refrigeration atmosphere pre-concentrator

Examples

Experimental program
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Effect test

Example Embodiment

[0035] Example 1

[0036] Such as Figure 1 to 4 As shown, the electronic refrigeration atmospheric preconcentrator of this embodiment freezes collector 1 and collector 2 to -20°C at the same time, and the sample gas first passes through collector 1 during sampling, and the water and high-carbon compounds in VOC are frozen in the collection On the surface of the glass beads of the vessel 1, the low-carbon compounds in the VOC enter the collector 2 to be adsorbed by the adsorbent, and at the same time oxygen, nitrogen, carbon dioxide and inert gases are evacuated at one time; figure 1 .

[0037] After the sample is injected, the temperature of collector 1 is increased from -20°C to 10°C, and the vaporized high-carbon compounds are transferred to collector 2 with nitrogen or helium at a flow rate of 15 ml per minute, and the water is retained. In collector 1, complete removal of water, oxygen, nitrogen, carbon dioxide and inert gases in the sample. See in the attached drawings fig...

Example Embodiment

[0040] Example 2

[0041] The difference between the electronic refrigeration atmospheric preconcentrator of this embodiment and the embodiment 1 is that the temperature at which the collector 1 and the collector 2 are simultaneously frozen by the electronic refrigeration is different. In this embodiment, the temperature is simultaneously frozen to -50°C, and the sample is injected in series. Two collectors are used to collect VOC in sections at a time, and carbon dioxide, nitrogen, oxygen and inert gases are evacuated at the same time. The water in the sample and the high-carbon compounds with high boiling points in the VOC are collected by collector 1, while the low boiling point Low-carbon compounds are collected by the adsorbent in collector 2;

[0042] After the sample is injected, the collector 1 is heated to 0°C, and the high-carbon compounds in the collector 1 are transferred to the collector 2 with nitrogen or helium;

[0043] After the transfer is completed, freeze the col...

Example Embodiment

[0044] Example 3

[0045] The electronic refrigeration atmospheric pre-concentrator of this embodiment has the same structure as embodiment 1, but the difference is: the electronic refrigeration freezes the collector 1 and the collector 2 to -30°C at the same time. The device collects VOC in sections, and simultaneously evacuates carbon dioxide, nitrogen, oxygen, and inert gas at one time. The water in the sample and the high-carbon compounds with high boiling points in the VOC are collected by collector 1, while the low-carbon compounds with low boiling points are collected by collector 1. Collect the adsorbent in the device 2;

[0046] After the sample injection, the collector 1 is heated to 30°C, and the high-carbon compounds in the collector 1 are transferred to the collector 2 with nitrogen or helium;

[0047] After the transfer, freeze the cold focus 3 to -60℃, then raise the temperature of the collector 2 to 240℃, use helium to transfer the VOC to the cold focus 3 to be adsor...

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Abstract

The invention discloses an electronic refrigeration atmosphere pre-concentrator. The electronic refrigeration atmosphere pre-concentrator comprises a 1-counter-8 eight-way valve, a six-way valve, two electromagnetic valves, a three-way electromagnetic valve, a needle-shaped regulating valve, a mass flow rate controller, a pressure sensor, a collector (1), a collector (2) and a cold focuser (3) which are sequentially connected, wherein a three-stage VOC refrigeration collection mode is adopted; the collector 1 is a stainless steel tube with the diameter of 1/8 inch, which is filled with glass beads; the collector (2) is a stainless steel tube with the diameter of 1/8 inch, which is filled with an adsorbent; the cold focuser (3) is a stainless steel tube with the diameter of 1/16 inch, which is filled with an adsorbent, and the cold focuser (3) is adsorbed by the adsorbent, and is heated up to 240 DEG C from -20 DEG C at the temperature rise velocity of 2250 DEG C/min above, so that VOC is rapidly injected into a GC (gas chromatograph) or a GC-MS (gas chromatography-mass spectrometry). The aim of concentrating VOC can be achieved without taking liquid nitrogen as a refrigerant.

Description

technical field [0001] The invention relates to an electronic refrigeration atmospheric pre-concentrator. Background technique [0002] At present, there are two companies producing atmospheric preconcentrators in the world, one is: 8900DS produced by GD Environmental in the United States; the other is 7100 and 7200 produced by Entech Instruments in the United States. The concentration principle and operation method adopted by the two companies are almost the same, both of which use liquid nitrogen as the refrigerant, and are divided into three stages of freezing collectors, namely collector 1, collector 2 and cold focusing 3. Its purpose is to remove water, oxygen, nitrogen, carbon dioxide and inert gases in the sample gas containing VOC, and only keep the VOC components for analysis. VOC is the general term for volatile organic compounds. [0003] The enrichment principle and operation method of the existing atmospheric pre-concentrator are described as follows: [0004...

Claims

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Application Information

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IPC IPC(8): G01N1/40
Inventor 李勘
Owner 李勘
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