Quantitative measuring method for trace amount of foreign gas in chlorine

Abstract

The invention discloses a method for quantitatively measuring trace impurity gas in chlorine, which is used for quantitatively measuring trace impurity gas in chlorine during the production process of ionic membrane sodium hudroxide. The method mainly adopts strict sampling measures to carry out drying purification on samples and puts the samples in a gas phase chromatographic instrument to carry out quantitative analysis; and the chromatographic column of the gas phase chromatographic instrument adopts a polyvinylidene chloride globule chromatographic column so as to improve gas separation effect. The method provides accurate data for ionic membrane electrolysis bath process, and ensures timely adjustment of process operation, thereby ensuring that process parameters can obtain optimum conditions and prolonging the service life of an electrolysis bath.

Description

technical field [0001] The invention belongs to gas quantitative determination method, in particular to the quantitative determination method of trace impurity gas in chlorine gas. Background technique [0002] In the production of ionic membrane caustic soda, it is necessary to accurately measure the trace amount of H in chlorine gas 2 , O 2 , N 2 , According to the measurement data, timely grasp the ion-exchange membrane caustic soda production process and whether the ion-exchange membrane electrolyzer is operating normally. When the hydrogen content in the chlorine gas is high, explosion accidents are prone to occur; when the oxygen content in the chlorine gas is high, the current efficiency is low, and pinholes appear in the ion membrane; when the nitrogen content in the chlorine gas is high, nitrogen trichloride is easily formed, which is harmful to production safety Great danger. Based on the above, it is necessary to accurately, quickly and timely measure the trac...

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Problems solved by technology

[0003] At present, the explosion method and Austenitic gas analyzer are generally used to measure trace impurity gases in chlorine gas. This method is only applicable to the situation where the content of impurity gases in chlorine gas is relatively high.

And when impurity gas content is below 2%, get 100 milliliters gas chlorine and absorb with potassium iodide, remaining gas volume is only 1-2 milliliters, so analysis with explosion method, relative error is big, repeatability is poor, and trace oxygen and nitrogen cannot determination

Another method is to absorb the chlorine gas and perform chromatographic analysis on the remaining impurity gas. The disadvantage of this method is that the sample is polluted during the gas transfer process due to poor sealing during sampling, resulting in inaccurate data and large errors.

Therefore, there is no quantitative determination method for trace impurity gases with small errors.

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