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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 bottle, and the cost is relatively high, especially for those laboratories that have not many samples and have to do it at the same time, it is indeed a huge trouble to fill the tank with liquid nitrogen, and the liquid nitrogen spray When the noise is very large, it seriously hinders the application of the atmospheric pre-concentrator in air pollution detection.

Method used

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  • Electronic refrigeration atmosphere pre-concentrator

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as Figures 1 to 4 As shown, the electronic refrigeration atmospheric pre-concentrator in this embodiment freezes the collector 1 and the collector 2 to -20°C at the same time. On the surface of the glass beads of the collector 1, the low-carbon compounds in the VOC enter the collector 2 and are adsorbed by the adsorbent, and at the same time, oxygen, nitrogen, carbon dioxide and inert gases are evacuated at one time; see the figure in the manual figure 1 .

[0037] After the sample injection is completed, 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 the collector 1, the water, oxygen, nitrogen, carbon dioxide and inert gases in the sample are removed. See attached in the manual figure 2 .

[0038]The production of cold focus 3 can not use a stainless steel tube with a diameter of 0....

Embodiment 2

[0041] The electronic refrigeration atmospheric pre-concentrator of this embodiment differs from Embodiment 1 in that the temperature of the simultaneous freezing of the collector 1 and the collector 2 by the electronic refrigeration is different. Two collectors are used to collect VOC in sections at one time, and carbon dioxide, nitrogen, oxygen and inert gases are evacuated at one time. The water in the sample and the high-carbon compounds with high boiling point in VOC are collected by collector 1, while those with low boiling point are collected by collector 1. Low-carbon compounds are collected by the adsorbent in collector 2;

[0042] After the sample injection is completed, 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, freeze the cold focus 3 to -60°C, then raise the temperature of the collector 2 to 220°C, use helium to transfer the VOC to the c...

Embodiment 3

[0045] The structure of the electronic refrigeration atmospheric pre-concentrator in this embodiment is the same as that of Example 1, the difference is that the electronic refrigeration freezes the collector 1 and the collector 2 to -30°C at the same time, injects samples in series, and uses two collectors at a time. The collector collects VOC in sections, and at the same time evacuates carbon dioxide, nitrogen, oxygen and inert gases at one time. The water in the sample and the high-carbon compounds with high boiling points in VOC are collected by collector 1, while the low-carbon compounds with low boiling points are collected by collector 1. Sorbent collection in vessel 2;

[0046] After the sample injection is completed, 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°C, then raise the temperature of the collector 2 to...

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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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