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Image measuring method and system of sulfite oxidizing reaction rate

A technology of oxidation reaction rate and sulfite, which is applied in the direction of chemical reaction of materials for analysis, etc., can solve the problems of inability to measure the change rule of reaction rate, large error of gas-liquid contact area, short contact time, etc. Convenience, low consumption of reactants, and small measurement errors

Inactive Publication Date: 2002-02-13
TSINGHUA UNIV
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Problems solved by technology

The disadvantage of this scheme is that it is difficult to form a uniform liquid film on the surface of the cylinder during the experiment, so the error of the gas-liquid contact area is large
In addition, the contact time between the gas and the solution is definite, but generally speaking, the contact time is very short, so it is impossible to measure the change law of the reaction rate with the contact time

Method used

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  • Image measuring method and system of sulfite oxidizing reaction rate
  • Image measuring method and system of sulfite oxidizing reaction rate
  • Image measuring method and system of sulfite oxidizing reaction rate

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Experimental program
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Embodiment approach

[0027] The oxygen bubbles will be absorbed in the sulfite solution due to the chemical reaction, so the volume of the bubbles will be reduced; when the oxygen bubbles enter the sulfite solution, there are oxygen and sulfite ions near the gas-liquid interface The reaction causes the oxygen bubbles to gradually shrink. Therefore, studying the law of the shrinkage of a single bubble in the solution can find the reaction rate at each moment.

[0028]The present invention is based on the above mechanism and adopts the following technical solutions: the measurement system of the present invention mainly includes a reaction vessel 1 containing a sulfite solution, a single oxygen bubble generation and isolation system 9, a light source 2, a light-shielding hole 3, and a convex lens 5. , The optical path imaging system composed of the image screen 6, the temperature signal acquisition system, the camera 7, and the computer 13 which is connected with the camera and the temperature signal ac...

specific Embodiment

[0054] Specific steps are as follows:

[0055] (1) Inject a certain concentration of sodium sulfite solution into the container and protect it with nitrogen;

[0056] (2) Take a sample of the solution and store it in a sampling bottle;

[0057] (3). The temperature is controlled to the specified value, the impurity gas in the gas injection system is driven out with pure oxygen, and the bubbles are prepared;

[0058] (4). Use the oxygen bubble generation and isolation system to generate an isolated oxygen bubble;

[0059] (5). Debug the optical path imaging system to make the background light enter from behind the bubble;

[0060] (6). Take the first picture of the bubble and start timing at the same time;

[0061] (7). Take a picture at regular intervals and record the time at the same time;

[0062] (8). When the bubble volume decreases to a certain extent, the measurement at that temperature is ended.

[0063] (9). Transfer photos from the memory stick of the camera to the compu...

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Abstract

The present invention relates to a method and a system for measuring oxidizing reaction rate of sulfite and the field of gas-liquid phase chemical reaction rate measuring technology. By means of photography and analysis of the immobile single oxygen bubble inside sulfite solution and the continuous measurement of the bubble volume and the gas-liquid contact area, the oxidation reaction rate in unit gas-liquid contact area may be found out directly. The method is simple and convenient and can obtain accurate and precise measurement data intuitively. The reaction rate in different temperature and basically unchanged reactant concentration and catalyst concentration may be measured and this reduces the measurement error caused by solution component change.

Description

Technical field [0001] The invention belongs to the technical field of measurement of the chemical reaction rate between gas and liquid phases, and particularly relates to a method and system for measuring the sulfite oxidation reaction rate by using an image method. technical background [0002] In the prior art, in order to control the emission of sulfur dioxide produced by the combustion of fossil fuels, limestone wet scrubbing is the most widely used flue gas desulfurization process. The forced oxidation in the absorption tower can accelerate the conversion of calcium sulfite to calcium sulfate in the slurry, resulting in the formation of gypsum (CaSO4·2H2O). At present, there is uncertainty in the understanding of the reaction mechanism of the oxidation of CaSO3 to CaSO4 and the value of the reaction kinetic parameters in the forced oxidation process (the reaction is a gas-liquid heterogeneous reaction under actual wet desulfurization conditions). Although this reaction has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/75
Inventor 李彦史建
Owner TSINGHUA UNIV
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