Joint detection method for high-purity SO3 gas and impurity SO2 gas therein
A SO2, high-purity technology, applied in the direction of chemical analysis by titration, can solve problems such as complicated methods, inability to combine gas detection, etc., and achieve the effect of good measurement precision
Inactive Publication Date: 2016-08-24
CHONGQING AOGEMEI GAS CO LTD
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Problems solved by technology
This method is cumbersome and complicated, and cannot combine SO 3 and SO 2 Gas joint detection
[0005] Another example is the Japanese patent JP203014633A2SO 3 Densitometer, which provides an accurate measure of SO by monitoring the pressure of gas cells at high temperatures 3 content of the densitometer, but this method is only applicable to SO in flue gas 3 content measurement, not suitable for high concentration SO 3 Gas content and its SO 2 Joint determination of impurity gas content
Method used
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Effect test
Embodiment 1
[0040] The test was carried out under the climate conditions of 35°C and 1 atmosphere, the temperature inside the insulation jacket was controlled to be 70°C, and the gas temperature was 70°C. The test results are as follows:
[0041]
Embodiment 2
[0043] The test was carried out under the climate conditions of 5°C and 1 atmosphere, the temperature inside the insulation jacket was controlled to be 70°C, and the gas temperature was 70°C. The test results are as follows:
[0044]
[0045] According to the data obtained above and the standard deviation value, it is shown that under the condition of stable gas flow, high-purity SO in this method 3 Gas and its impurity SO 2 The measurement precision of gas volume percentage concentration is good, and the measurement standard deviation is not more than 0.1%.
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Abstract
The invention relates to a joint detection method for high-purity SO3 gas and impurity SO2 gas therein. The joint detection method comprises the following steps of: using an absorbing device for sampling at constant volume, and then using an aqueous alkali for absorbing, thereby acquiring a total volume percentage concentration of the high-purity SO3 gas and impurity SO2 gas therein; treating the absorption liquid; adopting a direct iodometry for measuring the volume percentage concentration of SO2 gas; subtracting the volume percentage concentration of SO2 gas from the total volume percentage concentration of the high-purity SO3 gas and impurity SO2 gas therein, thereby acquiring the concentration of high-purity gas. According to the method provided by the invention, the measuring precision of high-purity SO3 gas is high and the measuring standard deviation is not more than 0.1%. The method provided by the invention can be used for detecting the high-purity SO3 gas and is especially fit for the detection for the high-purity SO3 gas containing few SO2 gas and inert gas.
Description
technical field [0001] The present invention relates to high purity SO 3 Gas and its impurity SO 2 Gas detection methods. The method belongs to a trinity of sampling, constant volume and absorption for the detection of high-purity SO 3 Gas and its impurity SO 2 Combined detection method of gas. Background technique [0002] In a patented process of using high-purity sulfur trioxide to synthesize chlorosulfonic acid, it breaks through the traditional concept that only low-concentration sulfur trioxide can be used to prepare chlorosulfonic acid. However, the synthesis reaction of high-concentration sulfur trioxide gas and high-concentration hydrogen chloride gas has the advantages of reducing raw material consumption, less pollution, and good product quality. Practice has proved that the advantages of this process method are being recognized by people. Therefore high purity SO 3 The detection of gas concentration is very important, which can provide a strong scientific b...
Claims
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IPC IPC(8): G01N31/16
Inventor 刘德举汪强
Owner CHONGQING AOGEMEI GAS CO LTD
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