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Measuring method and device for simultaneously measuring membrane permeability of each gas mixed gas

A technology of gas permeation and membrane permeability, which is applied in the fields of membrane material analysis and gas chromatography analysis, can solve the problems of inaccurate quantification, large dead volume, and inconvenient operation, and achieve convenient diffusion coefficient and solubility coefficient, strong separation ability, good repeatability

Active Publication Date: 2014-02-12
INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method and device for simultaneously measuring the membrane permeability of each component gas of the mixed gas, which solves the problem of large dead volume, long test time, and inability to accurately quantify; the connection mode with the gas chromatograph is not simple enough, and the operation is inconvenient And other issues

Method used

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  • Measuring method and device for simultaneously measuring membrane permeability of each gas mixed gas
  • Measuring method and device for simultaneously measuring membrane permeability of each gas mixed gas
  • Measuring method and device for simultaneously measuring membrane permeability of each gas mixed gas

Examples

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Embodiment 1

[0038] Gas chromatographic method for the simultaneous determination of propane, n-butane and isobutane permeability of liquefied petroleum gas through polyethylene film

[0039] This embodiment adopts a gas permeation cell dedicated to gas chromatography with a narrow strip cell chamber, see figure 1 . The gas permeation cell 3 comprises a permeation cell base 19, a permeation cell upper cover 18 having a symmetrical structure with the permeation cell base 19, a gasket 17 arranged between the permeation cell base 19 and the permeation cell upper cover 18, the permeation cell base 19 and the permeation cell upper cover 18 are all provided with screw holes, fixed by bolts and nuts; the base 19 of the permeation tank and the upper cover 18 of the permeation tank are both flat plates with grooves on one side, and the grooves are relatively fastened, and the surroundings of the grooves are in contact with the membrane to be tested. The materials are attached to each other to form...

Embodiment 2

[0064] Example 2: A test method for simultaneously measuring the multi-component permeability of membrane and sheet materials by refitting the original six-way valve of the gas chromatograph for the penetration of mixed gases

[0065] Nowadays, gas chromatographs are mostly equipped with six-way valves, which can be simply converted into four-way valves for simultaneous determination of multi-component permeability of membrane and sheet materials when mixed gases pass through. Unscrew the two joint nuts of the original six-way valve for connecting the sample gas pipe, and block the two joints of the six-way valve with silicone rubber plugs. Remove the quantitative ring of the six-way valve, and use figure 1 The medium permeation cell replaces the quantitative loop, and connects the test gas lines 4 and 11 of the permeation cell to the joints of the six-way valve that were originally connected to the quantitative loop. All the other analytical methods and operating steps are t...

Embodiment 3

[0066] Example 3: Gas permeation cells connected in series are used for the test method of simultaneous determination of multi-component permeability of membrane and sheet materials when mixed gas permeates

[0067] If the membrane with low permeability is measured, the permeation area of ​​the membrane material can be increased, and two gas permeation cells can be used in series. Connect the sample gas outlet of one cell with the sample gas inlet of the other cell with the sample gas connection pipe 22, and connect the test gas outlet with the test gas inlet with the test gas connection pipe 21, such as Figure 7 shown. The operating steps of the remaining analytical methods are the same as in Example 1. .

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Abstract

The invention discloses a measuring method and a device for simultaneously measuring the membrane permeability of each gas in mixed gas. According to the measuring method and device, the combination of a gas chromatograph and a gas permeation tank for measuring the membrane permeability is realized, and the permeabilities of multiple components of a thin film and a flake material when the mixed gas permeates through the thin film and the flake material can be simultaneously and rapidly measured accurately one time; furthermore, in a connecting method disclosed by the invention, an air blowing system does not need to be arranged, the measuring method can be used for measuring the thin film with the diameter of 8mm or even smaller without that the gas passes through a quantitative feeding device, and a gas chromatography flame ionization detector has the enough sensitivity for measuring penetration gas after permeating for 5 minutes. By utilizing the measuring method and device, the interaction effect of each component to the permeation rate can be researched when the mixed gas permeates, and the diffusion coefficients of the solubility coefficients of the thin film and the flake material can be conveniently measured.

Description

Technical field: [0001] The invention relates to the fields of membrane material analysis and gas chromatography analysis, in particular to a method and device for simultaneously measuring the membrane permeability of each component gas of a mixed gas. Background technique: [0002] At present, there are many methods for measuring the air permeability of films and sheets, and the common methods are different pressure method and equal pressure method. The different pressure method includes the pressure method and the volume method, and the equal pressure method includes the electrode method and the thermistor detection method. Among them, the pressure method is more commonly used. ASTM D1434-82(2009)e1 "Standard Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting" (Standard Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting) of the American Society for Testing and Materials, and my country's national standard...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N7/10
Inventor 何建强宋玉梅刘利
Owner INST OF ANALYSIS GUANGDONG ACAD OF SCI (CHINA NAT ANALYTICAL
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