Dynamic preparation device for standard gas of solid-phase or liquid-phase compounds and application thereof

A preparation device and standard gas technology, applied in the preparation of test samples, chemical/physical processes, mixing methods, etc., can solve the problems of high instrument cost, difficulty in accurately reaching more than 2 orders of magnitude, high instrument requirements, etc., to achieve expansion Effect of Concentration Range

Inactive Publication Date: 2010-05-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This method requires an accurate constant temperature device, and some methods also require a permeable membrane to ensure a stable gas permeation rate. This method has high requirements for instruments and high instrument costs.
At the same time, neither of the above two methods can prepare sample gas of solid-phase compounds, and it is difficult to prepare a certain proportion of mixed gases with different concentrations of various compounds.
For the concentration adjustment range of the sample compound gas, it is difficult for the above two methods to accurately reach more than 2 orders of magnitude

Method used

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  • Dynamic preparation device for standard gas of solid-phase or liquid-phase compounds and application thereof
  • Dynamic preparation device for standard gas of solid-phase or liquid-phase compounds and application thereof
  • Dynamic preparation device for standard gas of solid-phase or liquid-phase compounds and application thereof

Examples

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preparation example Construction

[0017] The preparation process and instrument structure schematic diagram of standard concentration gas preparation method among the present invention are as attached figure 1 shown. A dynamic preparation device for a solid or liquid compound standard gas, comprising a sample pool 1, a constant temperature evaporation pool 2, a gas flow controller 3, a liquid flow controller 4, a dilution gas source 5, and the sample pool 1 passes through a pipeline through a liquid The flow controller 4 is connected to the sample solution inlet provided on the side wall of the constant temperature evaporation pool 2, and a dilution gas inlet is provided on the wall of the constant temperature evaporation pool 2 near the sample solution inlet, and the dilution gas source 5 is controlled by the gas flow through the pipeline. The device 3 is connected to the dilution gas inlet; a sampling port and an exhaust gas port are arranged on the other side wall of the constant temperature evaporation poo...

Embodiment 1

[0055] Embodiment 1, preparation single-component compound concentration

[0056] In this example, the standard gas of pyrene, a low-volatile aromatic hydrocarbon substance, was prepared, and a solution with a concentration of 0.01 mol / L was prepared using n-hexane as a solvent.

[0057] Set the temperature of the constant temperature evaporation pool to 200°C. Stable for 1 hour.

[0058] Take 100ml of sample solution and store it in the sample solution bottle, turn on the micro flow rate controller, and adjust the liquid flow rate to 0.11ml / min. Accurately control the dilution gas flow rate to 2.7L / min. After stabilizing for 10 minutes, sample the gas with standard concentration.

[0059] Sample gas concentration calculation:

[0060] 1. Calculate with accurate formula, for nitrogen, a=0.137Pa*m 6 / mol 2 , b=0.0000387m 3 / mol, the gas flow rate is 2.7L / min, the pressure of the dilution gas before entering the evaporation pool is taken as the standard atmospheric pressu...

Embodiment 2

[0064] Embodiment 2, preparation multi-component compound gas

[0065] This method prepares the mixed gas of pyrene and trichlorophenol, which are difficult to volatile aromatic hydrocarbons, and uses n-hexane as a solvent. First, a mixed solution of pyrene and trichlorophenol with a concentration of 0.01mol / L is prepared.

[0066] Set the temperature of the constant temperature evaporation pool to 200°C and keep it stable for 1 hour.

[0067] Take 100lm of sample solution and store it in the sample solution bottle, turn on the micro flow rate controller, and adjust the liquid flow rate to 1ml / min. Accurately control the dilution gas flow rate to 2L / min. After stabilizing for 20 minutes, the standard concentration gas was obtained by sampling.

[0068] Sample gas concentration calculation:

[0069] 1. Calculate with accurate formula, for nitrogen, a=0.137Pa m 6 / mol 2 , b=0.0000387m 3 / mol, the gas flow rate is 2L / min, the pressure of the dilution gas before entering the...

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Abstract

The invention relates to the dynamic preparation of standard gas of solid-phase or liquid-phase compounds, in particular to a dynamic preparation device for the standard gas of the solid-phase or liquid-phase compounds and application thereof. The device comprises a sample cell, a constant temperature evaporation tank, a gas flow controller, a liquid flow controller, and a diluent gas source, wherein the sample cell is connected with a sample solution inlet formed on the side wall of the constant temperature evaporation tank via the liquid flow controller through a pipeline, the wall surface of one side, which is close to the sample solution inlet, of the constant temperature evaporation tank is provided with a diluent gas inlet, and the diluent gas source is connected with the diluent gas inlet via the gas flow controller through a pipeline; and the wall surface of another side, which is opposite to the sample solution inlet, of the constant temperature evaporation tank is provided with a sampling port and a tail gas port. The method is suitable to prepare standard gas of compounds (most of the compounds are the solid-phase or liquid-phase compounds) with low saturated vapor pressure at normal temperature, and different concentrations of mixed gas of various compounds.

Description

technical field [0001] The present invention relates to the dynamic preparation of solid-phase or liquid-phase compound standard gas, specifically a dynamic preparation device and application of solid-phase or liquid-phase compound standard gas. The dilution gas is balanced to obtain a dynamic preparation method for the standard gas of solid or liquid compounds. Background technique [0002] At present, the dynamic gas distribution methods existing at home and abroad can be divided into two types. One is to mix a certain concentration of raw material gas and dilution gas according to a certain ratio, so as to obtain a standard gas with a lower concentration. This method not only requires a large concentration of standard gas, but also its concentration adjustment range is limited by the standard gas concentration used. Another method is to sweep the liquid sample compound at constant temperature with diluent gas, so as to obtain the standard gas concentration of the sample ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28B01F3/00B01F23/00
Inventor 李海洋吴庆浩侯可勇花磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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