Solid phase and liquid phase compound dynamic gas preparation device and gas preparation method

A dynamic gas distribution and compound technology, applied in the direction of mixing methods, chemical instruments and methods, measuring devices, etc., can solve the problems of permeation tube structure depletion, lack, cumbersome operation, etc., to simplify operation, expand types, and shorten analysis time Effect

Inactive Publication Date: 2013-06-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

A dynamic preparation device for standard gas of solid-phase or liquid-phase compounds and its application (CN 101713712A) provides a standard gas preparation device for compounds with low saturated vapor pressure at normal temperature, which has a simple structure and is easy to operate, especially for solid-state compounds. The problem of gas preparation provides an effective solution, but there is a lack of standard gas for organic compounds that is prepared in conjunction with gas analysis devices.
Permeation tube rapid dynamic gas distribution device (CN 2421650Y) provides a device and method for rapid gas distribution using permeation tubes, which combines permeation tubes, constant temperature chambers, and gas channels into an integral structure, and realizes replacement of permeation tubes through quick plug joints. The structure is simple and compact, and it is easy to use, but it is still necessary to replace the permeation tube when preparing different gases.
High-precision mixed gas and gas supply device (CN 2555922Y) discloses a high-precision mixed gas and gas supply device, which uses parallel gas paths to achieve the purpose of mixing different mixed gases in a single set of gas distribution devices through multi-position switching valves. It has the advantages of uniform and stable gas supply for the mixed gas supply system with a large flow rate, but this device is not suitable for the preparation of mixed gases with high boiling points that are difficult to volatilize (normal temperature liquid or solid) components

Method used

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  • Solid phase and liquid phase compound dynamic gas preparation device and gas preparation method
  • Solid phase and liquid phase compound dynamic gas preparation device and gas preparation method

Examples

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Effect test

Embodiment 1

[0081] For the examination of the dynamic gas distribution system and gas distribution method performance of a kind of solid phase and liquid phase compound described in the present invention, experiment is solvent with methanol, prepares four kinds of concentrations to be respectively 5.6 * 10 -4 mol / L, 5.6×10 -3 mol / L, 5.6×10 -2 mol / L, 5.6×10 -1 mol / L benzene solution. Set the flow rate of the diluent gas to 4L / min, the chamber temperature to 75°C, and for the concentration to be 5.6×10 -4 mol / L sample standard solution, when the flow rate of the micro syringe pump is 2.5μl / min, 5μl / min, 12.5μl / min, the corresponding standard gas concentration is 10ppbv, 20ppbv and 50ppbv respectively. By analogy, when the flow rates of the micro-injection pumps are 2.5 μl / min, 5 μl / min, and 12.5 μl / min, the concentrations are 5.6×10 -3 mol / L, 5.6×10 -2 mol / L, 5.6×10 -1The concentration of the standard gas corresponding to the sample standard solution in mol / L is easy to obtain. In th...

Embodiment 2

[0083] For the examination of the dynamic gas distribution system and gas distribution method performance of a solid phase and liquid phase compound described in the present invention, the experiment uses pure water as solvent, and prepares four kinds of concentrations that are respectively 6.54×10 -5 mol / L, 6.54×10 -4 mol / L, 6.54×10 -3 mol / L, 6.54×10 -2 mol / L, 6.54×10 -1 mol / L solution of methyl tert-butyl ether and 2-butanone. Set the flow rate of the diluent gas to 0.5L / min, the temperature of the chamber to 120°C, and the temperature of the gas mixing part to 120°C. For a concentration of 6.54 x 10 -5 mol / L sample standard solution, when the flow rate of the micro syringe pump is 2.5μl / min, 5μl / min, 12.5μl / min, the corresponding standard gas concentration is 10ppbv, 20ppbv and 50ppbv respectively. By analogy, when the flow rates of the micro-injection pumps are 2.5 μl / min, 5 μl / min, and 12.5 μl / min, the concentrations are 5.6×10 -3 mol / L, 5.6×10 -2 mol / L, 5.6×10 -1...

Embodiment 3

[0085] For the examination of the dynamic gas distribution system and gas distribution method performance of a kind of solid phase and liquid phase compound described in the present invention, experiment is solvent with ethanol, prepared four kinds of concentration respectively to be 6.54 * 10 -5 mol / L, 6.54×10 -4 mol / L, 6.54×10 -3 mol / L, 6.54×10 -2 mol / L solution of naphthalene and methyl salicylate. Set the flow rate of the diluent gas to 0.5L / min, the temperature of the cavity to 120°C, and the temperature of the gas mixing part to 120°C. For a concentration of 6.54 x 10 -5 mol / L sample standard solution, when the flow rate of the micro injection pump is 2.5μl / min, 4μl / min, 5μl / min, 8μl / min, 10μl / min and 12.5μl / min, the corresponding standard gas concentration is 10ppbv , 16ppbv, 20ppbv, 32ppbv, 40ppbv and 50ppbv. By analogy, when the flow rates of the micro-injection pumps are 2.5 μl / min, 5 μl / min, and 12.5 μl / min, the concentrations are 5.6×10 -3 mol / L, 5.6×10 -2 m...

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Abstract

The invention provides a solid phase and liquid phase compound dynamic gas preparation device and a gas preparation method. The gas preparation system comprises a diluted gas supplying portion, a diluted gas preheating portion, a sample standard liquid micro-scale control sample injector, a gas mixing portion and a gas analysis device. According to the gas preparation method, diluted gas passes through the diluted preheating device and enters a liquid evaporating device in a certain flow, meanwhile sample standard liquid enters the liquid evaporating device to mix with the diluted gas, finally the mixed gas passes through the gas mixing portion for being mixed evenly, a part of gas enters the gas analysis device for analysis and other gas is exhausted as tail gas. The flow ratio of sample gas and the diluted gas can be effectively controlled due to change of flow of the micro-scale sample injector and flow of the diluted gas so that the mixed gas with different concentrations can be obtained without preparation of the sample standard liquid in all concentration points and preparation efficiency and accuracy of solid phase and liquid phase compound standard gas are improved.

Description

technical field [0001] The invention relates to a dynamic gas distribution device and gas distribution method for solid-phase and liquid-phase compounds. Specifically, the gas distribution device is used to inject a sample standard liquid into a constant-volume liquid evaporation device at a required flow rate to be vaporized and mixed with the required gas distribution device. The flow rate is mixed with the diluent gas with a stable temperature, and the standard gas at different concentration points can be obtained by simply adjusting the flow rate of the micro-syringe pump or the flow rate of the diluent gas, so as to realize continuous online preparation and supply of a certain concentration of sample standard gas. Background technique [0002] Standard gases for solid and liquid compounds are in great demand in the fields of environmental monitoring, product inspection and experimental research. In environmental monitoring, industrial production and residential life emi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/38G01N1/44G01N30/06B01F3/02B01F3/20B01F23/10B01F23/70
Inventor 李海洋谢园园花磊侯可勇崔华鹏陈平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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