Measuring method for sulfate radical in gas

A determination method and technology for sulfate radicals are applied in the preparation of test samples, measurement of color/spectral properties, sampling devices, etc., which can solve the problems of high equipment cost, difficulty in measuring trace components, and low detection limit, and achieve sampling operation Rigorous, reduce measurement error, improve the effect of accuracy

Inactive Publication Date: 2014-03-26
PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The gravimetric method has high accuracy and low-cost equipment, but the procedures are cumbersome and time-consuming, and it is difficult to determine trace components
The volumetric method is easy to operate, but the titration end point is not easy to control, and the accuracy of the measurement results is not high
Plasma atomic emission spectrometry has fast analysis speed, good selectivity, low detection limit, and less sample consumption, but there are many factors that affect the intensity of spectral lines. When the content (concentration) is large, the accuracy is poor. At the same time, the equipment high cost
Flame atomic absorption spectrophotometry has high sensitivity, strong anti-interference ability, high precision, good selectivity, and wide analysis range, but the instrument is expensive
Therefore, there is no easy-to-operate and highly accurate method for the determination of sulfate radicals at present.

Method used

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  • Measuring method for sulfate radical in gas
  • Measuring method for sulfate radical in gas
  • Measuring method for sulfate radical in gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The mensuration of sulfate radical concentration in the chlorine in embodiment 1 electrolytic chlorine technology

[0073] 1. Sampling and sample preparation: first establish the figure 1In the sampling and sample preparation device shown, chlorine gas containing sulfate radicals is sequentially passed into a buffer bottle and an absorption bottle, and the absorption bottle contains 700mL of NaOH solution with a mass fraction of 20%. The mouth of the buffer bottle and the absorption bottle is sealed with a matching rubber stopper, and the buffer bottle and the absorption bottle are connected by a latex tube. Open the valve, feed chlorine gas at a rate of 1 mL / min, close the valve after 1 hour, and complete the sampling of electrolytic chlorine gas; then use nitrogen to purge the chlorine gas in the buffer bottle; finally let the absorption bottle cool to room temperature to obtain test solution A. Wherein the weight of the absorption bottle before absorption is 382.01g...

Embodiment 2

[0076] The mensuration of sulfate radical concentration in the hydrogen chloride gas of embodiment 2

[0077] 1. Sampling and sample preparation: First, set up a sampling and sample preparation device, and then pass hydrogen chloride gas containing sulfate radicals into a buffer bottle and an absorption bottle in turn, and the absorption bottle contains 700mL of NaOH solution with a mass concentration of 20%. The mouth of the buffer bottle and the absorption bottle is sealed with a matching rubber stopper, and the buffer bottle and the absorption bottle are connected by a latex tube. Open the hydrogen chloride gas valve, let it flow in at a rate of 1 mL / min for 1 hour, close the valve, and complete the sampling of hydrogen chloride gas. Then use nitrogen to purge the hydrogen chloride gas in the buffer bottle, and finally let the absorption bottle cool to room temperature to obtain test solution A. Among them, the weight of the absorption bottle before absorption is 382.01g, ...

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Abstract

The invention relates to a measuring method for sulfate radical in gas, and belongs to measuring methods for impurities in gas. The technological problem to solve is to provide the method for quickly and precisely measuring the sulfate radical in gas. The method comprises the following steps: a, sampling and preparing a sample: introducing gas containing sulfate radical into a buffering device and an absorbing device, and cooling the absorbing device to the indoor temperature to obtain a sample solution A after the gas is absorbed by a solution in the cooling device; b, treating the sample: transferring partial solution A to an instrument with constant volume, adding hydrochloric acid, a dispersing agent and a barium chloride solution sequentially to enable the sulfate radical in the solution to be settled and dispersed uniformly, shaking up, fixing the volume, and standing to the indoor temperature to obtain a sample solution B; c, measuring: measuring absorbancy value of the sample solution B by adopting a spectrophotometer to obtain the weight of the sulfate radical, and finally, calculating the concentration of the sulfate radical in the gas. The concentration of the sulfate radical measured by adopting the method provided by the invention is 10-524 ppm. The method is simple and quick to operate, and the precision of the measured result is high.

Description

technical field [0001] The invention belongs to a method for measuring impurities in gas, in particular to a method for measuring sulfate radicals in gas. Background technique [0002] As we all know, if chlorine contains a large amount of water vapor, it is easy to form hydrochloric acid and hypochlorous acid, and hypochlorous acid is very unstable and easily decomposed into hydrochloric acid and nascent oxygen. The nascent oxygen has a strong oxidizing property, so the wet chlorine gas has a strong corrosiveness. Therefore, the wet chlorine gas produced in the electrolytic chlorine gas process generally needs to be dried with concentrated sulfuric acid before it can be transported to the next process. However, the sulfuric acid mist entrained in the chlorine gas drying process will directly affect the quality of chlorine gas, the stable operation of the compressor and the service life of the equipment. If the defogging effect is not ideal, it will cause sulfuric acid, sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/22G01N1/28G01N21/31
Inventor 陈常可石玉英陈德明张静闫月娥王益梅陈映志龙文卫
Owner PANZHIHUA STEEL ENTERPRISES XINYU CHEM
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