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
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[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 figure
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 cold f
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 adsorbed
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