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Detection method of hydrogen sulfide

A detection method, hydrogen sulfide technology, applied in the preparation of test samples, chemical analysis by titration, etc., can solve the problems of olfactory fatigue, inability to detect hydrogen sulfide, weak odor, etc., and achieve the effect of high precision

Inactive Publication Date: 2014-02-05
大连大公检验检测有限公司
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Problems solved by technology

And when the concentration is low, the enhancement of the initial odor of hydrogen sulfide is proportional to the increase of the concentration; but when the concentration exceeds 10mg / m 3 After about 10 minutes, the concentration continues to rise while the odor weakens instead, causing people's sense of smell to be tired and unable to detect the presence of hydrogen sulfide
Therefore, many hydrogen sulfide poisoning casualties occurred when people did not realize the danger, so it cannot be judged whether there is danger based on whether the smell is strong or not.

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  • Detection method of hydrogen sulfide

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Embodiment 1

[0019] The hydrogen sulfide detection method is characterized in that the hydrogen sulfide in the crude oil is used to measure the hydrogen sulfide in the crude oil through nitrogen stripping, and the crude oil is pretreated by heating and stirring, and the temperature is set at 30-90°C;

[0020] Among them, the calculation of hydrogen sulfide content in crude oil

[0021] ω=17.04c(V 1 -V 2 ) / m×1000, (1)

[0022] In the formula, ω—mass fraction of hydrogen sulfide in crude oil, 10 -6 ;

[0023] c—concentration of sodium thiosulfate standard solution, mol / L;

[0024] V1, V2—consumption of sodium thiosulfate standard solution during blank titration and sample titration, mL;

[0025] m—the mass of the oil sample, g.

[0026] The temperature rising pretreatment condensed crude oil is 30-40°C, and the heavy oil is 70-75°C.

[0027] The nitrogen flow rate was controlled at 0.1 L / min, kept for 5 min, and then kept at a flow rate of 0.05 L / min for 10 min.

[0028] Prepare the ...

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Abstract

The invention relates to a detection method of hydrogen sulfide. The hydrogen sulfide in crude oil is detected through using a nitrogen air stripping method, the crude oil is pretreated by adopting warming and stirring, the temperature is set to be 30-90 DEG C; condensed crude oil is obtained at the temperature of 30-40 DEG C during warming and pretreating, and thickened oil is obtained at the temperature of 70-75 DEG C during the warming and the pretreating. The flow velocity of the nitrogen is controlled to be 0.1L / min for 5min, and to be 0.05L / min for 10min. According to the detection method, a method in which the hydrogen sulfide in the crude oil is stripped by using nitrogen, the hydrogen sulfide in the nitrogen is detected by using iodometry, and the detected content of the hydrogen sulfide in the nitrogen is converted to the content of the hydrogen sulfide in the crude oil; the proper crude oil temperature, the proper carrier gas flow rate and stripping time are selected, and the precision is high.

Description

technical field [0001] The invention relates to the technical field of crude oil detection, in particular to a method for detecting hydrogen sulfide. Background technique [0002] Hydrogen sulfide is a colorless gas with the smell of rotten eggs, soluble in water, ethanol, gasoline, kerosene, and crude oil. When dissolved in water, it will generate hydrogen sulfuric acid, which is chemically unstable. The maximum allowable concentration of workshop air in my country is 10mg / m 3 . According to the requirements of SY / T6137-2005 recommended practice standard for oil and gas production and natural gas processing equipment containing hydrogen sulfide, the hydrogen sulfide content should be less than 15mg / m 3 . The factory workshop stipulates that the IDLH value of hydrogen sulfide is 300ppm, that is, at this concentration, workers should break away from contact within 30 minutes without causing irreversible health hazards. At the same time, the hazard level of hydrogen sulfi...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/28
Inventor 关杰关宇江美玲曹卉王清
Owner 大连大公检验检测有限公司
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