A multi-station series dynamic nitrogen adsorption specific surface meter and specific surface measurement method

A technology of nitrogen adsorption and surface meter, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of lower test accuracy, poor specific surface test accuracy, unfavorable automatic control, etc., achieve shortened desorption time, improve test accuracy, The effect of improving test efficiency

Active Publication Date: 2016-03-30
北京精微高博仪器有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a puzzling problem in this method, that is, when measuring a small specific surface, the desorption peak is wide and short, and the integration error of the peak area is very large, resulting in poor test accuracy of the specific surface. The usual method is to use Hot water or hot air help accelerate desorption, but the effect is limited, and it complicates the test process and is not conducive to automatic control
The study found that the occurrence of the above phenomenon is directly related to the parallel connection of the sample tubes, because when the adsorption capacity is small, the limited nitrogen desorbed from the sample tubes is diluted by the parallel undesorbed three-way gas flow, which greatly reduces the test efficiency. precision

Method used

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  • A multi-station series dynamic nitrogen adsorption specific surface meter and specific surface measurement method
  • A multi-station series dynamic nitrogen adsorption specific surface meter and specific surface measurement method
  • A multi-station series dynamic nitrogen adsorption specific surface meter and specific surface measurement method

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Embodiment 1

[0036] A multi-station series dynamic nitrogen adsorption specific surface meter, comprising a plurality of four-way solenoid valves 1, a plurality of U-shaped sample tubes 2, a plurality of liquid nitrogen cups 3, a thermal conductivity pool 4 and a quantitative nitrogen gas pipeline 5;

[0037] Each four-way solenoid valve 1 forms an adsorption unit 6 with a sample tube 2 and a liquid nitrogen cup 3 respectively, and the third connection port and the fourth connection port of the four-way solenoid valve 1 are respectively connected to the two connection ends of the sample tube 2 , the bottom transverse edge of the sample tube 2 is immersed in the liquid nitrogen cup 3;

[0038] A plurality of adsorption units 6 are connected in series, the first connection port of the four-way solenoid valve 1 in the adsorption unit 6 at the head end communicates with the reference wall port of the thermal conductivity pool 4, and the four-way solenoid valve in the adsorption unit 6 at the ta...

Embodiment 2

[0042] The difference between embodiment 2 and embodiment 1 is that: the pipeline 5 for adding quantitative nitrogen gas is a gas path formed by a combination of double four-way valves.

[0043] Described double four-way valve comprises the first four-way valve 7 and the second four-way valve 8, and the second connecting port of the first four-way valve 7 communicates with the first connecting port of the second four-way valve 8, and the first four-way valve The first connection port of the one-way valve 7 is used for taking in nitrogen from the outside, the fourth connection port of the first four-way valve 7 is used for discharging gas to the outside, and the second connection port of the second four-way valve 8 is connected to the first four-way valve. The third connection port of the valve 7 is connected, and the third connection port of the second four-way valve 8 is connected in series with the fourth connection port of the second four-way valve 8 in the test gas circuit,...

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Abstract

The invention relates to a multistation in-series dynamic nitrogen adsorption specific surface instrument and a specific surface measuring method, the multistation in-series dynamic nitrogen adsorption specific surface instrument comprises a plurality of four-way electromagnetic valves, a plurality of U shape sample tubes, a plurality of liquid nitrogen cups, a thermal conductivity cell and a quantitative nitrogen pipeline; an adsorbing unit respectively comprises one four-way electromagnetic valve, one sample tube and one liquid nitrogen cup, the third communication port and the fourth communication port of the four-way electromagnetic valve are respectively connected with the two connecting ends of the sample tube; a plurality of adsorbing units are in in-series connection, the first communication port at the head end of the four-way electromagnetic valve in the adsorbing unit is communicated with a reference wall port of the thermal conductivity cell, the second communication port at the tail end of the four-way electromagnetic valve in the adsorbing unit is communicated with a measuring arm port of the thermal conductivity cell by the quantitative nitrogen pipeline, the second communication port close to the head end of the four-way electromagnetic valve and the first communication port close to the tail end of the four-way electromagnetic valve in two adjacent adsorbing units are communicated. The multistation in-series dynamic nitrogen adsorption specific surface instrument can greatly improve the shape of absorption and desorption peaks, improve the test precision, and shorten the test time during measuring of a small specific surface.

Description

technical field [0001] The invention relates to the technical field of dynamic nitrogen adsorption, in particular to a multi-station serial dynamic nitrogen adsorption specific surface instrument and a method for measuring the specific surface. Background technique [0002] At present, all dynamic multi-sample nitrogen adsorption instruments use a parallel gas path, that is, a mixed gas with a certain nitrogen partial pressure is divided into four paths, flows through four parallel sample tubes, and then merges back into one path to enter the thermal conductivity cell. During the test, the four sample tubes were immersed in the liquid nitrogen cup at the same time, adsorbed at the same time, and then returned from the liquid nitrogen temperature to room temperature one by one, and desorbed one by one. This method has been used to this day. There is a puzzling problem in this method, that is, when measuring the small specific surface, the desorption peak is wide and short, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/00
Inventor 钟家湘
Owner 北京精微高博仪器有限公司
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