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A test device and test method for gas diffusion coefficient

A testing device and gas diffusion technology, which is applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as affecting the accuracy of diffusion coefficient measurement, liquid easily sticking to the wall of the diffusion tube, and gas space convection disturbance, etc. Liquid discharge problem, high degree of automation, the effect of improving accuracy

Active Publication Date: 2018-08-14
SHANGHAI DINGMING CONTAINER STORAGE & TRANSPORTATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention is to overcome the technical deficiencies of the existing Stefan diffusion tube method testing device, that is to say, it is difficult to maintain balance by artificially injecting liquid from the upper part of the diffusion tube in conventional operations, and the liquid is easy to stick to the diffusion tube wall Shortcomings, there is also the problem that when the liquid is injected from the upper part of the diffusion tube, it will cause a large convective disturbance in the gas space in the diffusion tube, thereby affecting the accuracy of the diffusion coefficient measurement. The present invention proposes a volatile liquid-air (or Device and method for testing diffusion coefficient of other gases

Method used

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  • A test device and test method for gas diffusion coefficient
  • A test device and test method for gas diffusion coefficient
  • A test device and test method for gas diffusion coefficient

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Effect test

Embodiment 1

[0047] Embodiment 1: Taking n-hexane as an example, the n-hexane-air diffusion coefficient is determined by using the test device and method.

[0048] (1) the test device of a kind of gas diffusion coefficient, such as figure 1 , figure 2 As shown, including oil-free air compressor (23) or other gas cylinders (24), gas buffer bottle (21), gas flowmeter transmitter (20), liquid flowmeter transmitter (6), temperature control number Shown glass constant temperature water bath (12), heating coil (14), heater with temperature control (15), liquid bottle (1), liquid inlet / outlet pump (4), detachable casing glass diffusion tube (10) (the upper part is a horizontal vent pipe (29), the lower part is a vertical liquid storage pipe (30), and they are connected by a sleeve to facilitate disassembly), a temperature sensor (13), a pressure sensor (11), an altimeter (16 ), low-speed electric stirrer (17), gas chromatograph (19), gas pipe, liquid pipe and temperature control system (26) an...

Embodiment 2

[0066] Embodiment 2: Taking n-hexane, isohexane, n-heptane, and n-octane as examples, under the condition that the temperature, pressure and air flow rate of the system during the test are kept constant, the measurement method is the same as in Example 1, and different temperatures are measured Diffusion coefficients of each liquid in air. Table 1 summarizes the measurement results of Example 1 and this example.

[0067] Table 1 Diffusion coefficients of various liquids in air at different temperatures

[0068]

Embodiment 3

[0069] Embodiment 3: Taking n-hexane as an example, the n-hexane-nitrogen diffusion coefficient is determined by using the test device and method. When embodiment 1 is measured and finishes, keep the temperature of test system, pressure constant, close oil-free air compressor (23) and intake valve one (22), open nitrogen bottle (24) and intake valve two (25) , feed nitrogen into the horizontal vent pipe (29), and the measuring method is the same as that in Example 1, and measure the n-hexane-nitrogen diffusion coefficient at 30° C. (T=303.15K). The measurement result shows that the n-hexane-nitrogen diffusion coefficient is 8.26×10 at 30°C (T=303.15K). -6 m 2 / s.

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Abstract

The invention provides a device and a method for testing diffusion coefficients of gases, in particular provides a device and a method for testing diffusion coefficients of volatile liquid-air (or other gases), aims to overcome defects that when liquids are injected from upper parts of diffusion tubes during conventional operation, balance is difficult to keep all the time and the liquids stick to walls of the diffusion tubes easily and solves problems that the diffusion coefficient testing accuracy is affected and the like due to the fact that larger convection disturbance can be caused to gas space in the diffusion tubes when the liquids are injected from the upper parts of the diffusion tubes. With the adoption of the device, the liquids can be injected into the diffusion tubes from bottoms automatically, stably and slowly, so that the obvious convection disturbance effect cannot be caused to the gas space above the liquids , several liquids can be tested simultaneously, and the testing efficiency is improved. Besides, in consideration of safety, the glass diffusion tubes are vertically fixed in a temperature-control digital-display glass thermostatic water bath, and the safety of a testing system is improved finally while the testing accuracy is improved.

Description

technical field [0001] The invention belongs to the field of gas diffusion coefficient measurement, in particular to a test device and method for volatile liquid-air (or other gas) diffusion coefficient. Background technique [0002] Many industries, such as petrochemical, biomedicine, and building materials, are closely related to diffusion phenomena, and the diffusion process includes many diffusion mechanisms and is complex and changeable. Diffusion coefficient, as the main physical parameter to characterize the speed of the diffusion process, is very important for the study and calculation of various physical quantities in the diffusion process. Therefore, improving the convenience and accuracy of the diffusion coefficient test has important theoretical and practical significance for in-depth understanding of the mass transfer process and its application in industry. [0003] For the experimental determination of the diffusion coefficient of gas molecules, researchers a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
Inventor 黄维秋李丽纪妍妍王翊红徐先阳王兆利张齐正
Owner SHANGHAI DINGMING CONTAINER STORAGE & TRANSPORTATION CO LTD
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