Quick detecting tube for micro-hydrogen sulfide gas

A technology of hydrogen sulfide and detection tubes, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators on materials, etc., which can solve the problems of long sampling time of hydrogen sulfide, prolonging the analysis time and increasing the analysis capacity. Errors and other problems, to achieve the effect of short sampling time, improved sensitivity, and increased concentration

Inactive Publication Date: 2010-03-17
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] The main disadvantage of the iodometric method is that the sampling time for low-content hydrogen sulfide is long, such as for samples of the order of ppb, the sampling time may be as long as 60 minutes; the methylene blue method is only suitable for purified natural gas with a relatively stable concentration of hydrogen sulfide; gas chromatography Mainly there are high requirements for detectors, standard gas and sampling technology; the lead acetate reaction rate method needs to use special instruments to detect hydrogen sulfide
These measurement methods have a disadvantage: the use of equipment is expensive, bulky, and requires energy. In many cases, it cannot be measured on the spot. It is necessary to take active samples and then return to the laboratory for analysis, which prolongs the analysis time and increases the analysis time. error, especially for less stable gases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Measure 75mL of water glass with a modulus of 3.18, add 300mL of deionized water, and stir for 10min. Titrate with sulfuric acid to form a gel with pH = 8. The gel is first washed with a large amount of tap water and then washed with deionized water until pH = 7. There is no SO in the filtrate 4 2- exist. Filter with suction, and dry in a constant temperature oven at 120°C for 2 hours to obtain silica gel. Weigh 2gPb(Ac) 2 ·3H 2 Dissolve O in 20 mL of deionized water, add 10 mL of glycerin, mix well, add 5 g of silica gel into the mixture, stir to make it fully mixed, place in the dark at room temperature for 16 h, filter with suction, and dry in a constant temperature oven at 60 °C for 1 h. Put the carrier adsorbed with the indicator into 6 glass tubes with a diameter of 4 mm, and label them, and pass H with volume fractions of 0.000%, 0.001%, 0.002%, 0.004%, 0.006% and 0.008% respectively. 2 S gas sample. The sample volume is 50mL, and the aeration time is 1min....

Embodiment 2

[0025] Compared with Example 1, the indicator and drying conditions were changed. Weigh 2gPb(Ac) 2 ·3H 2 O and 1gBaCl 2 2H 2 Dissolve O in 20mL deionized water respectively, mix lead acetate solution and barium chloride solution, add 10mL glycerin, mix evenly, add 5g silica gel into the mixture, stir to make it fully mixed, place in dark place at room temperature for 16h, and filter with suction . Put the carrier adsorbed with the indicator into 6 glass tubes with a diameter of 4 mm, and label them, and pass H with volume fractions of 0.000%, 0.001%, 0.002%, 0.004%, 0.006% and 0.008% respectively. 2 S gas sample. The sample volume is 50mL, and the aeration time is 1min. The experimental results show that when the gas sample with a volume fraction of 0.004% and higher is injected, the detection tube has a significant color change, and the detection limit is 0.004%, which is about 60mg / m 3 .

Embodiment 3

[0027] Weigh 30gBaCl 2 2H 2 Dissolve O in 100mL deionized water, add sulfuric acid until no precipitate is formed, stir for 30min, wash with deionized water until there is no SO in the filtrate 4 2- exist. Filtrate with suction and dry in a constant temperature oven at 120°C for 2 hours to obtain BaSO 4 . Weigh 2gPb(Ac) 2 ·3H 2 O was dissolved in 20mL of deionized water, and 10mL of glycerin was added, mixed well, and 5g of BaSO 4 Add it into the mixture, stir to make it fully mixed, place it in the dark at room temperature for 16 hours, filter it with suction, and dry it in a constant temperature oven at 60°C for 1 hour. Put the carrier adsorbed with the indicator into 6 glass tubes with a diameter of 4 mm, and label them, and pass H with volume fractions of 0.000%, 0.001%, 0.002%, 0.004%, 0.006% and 0.008% respectively. 2 S gas sample. The sample volume is 50mL, and the aeration time is 1min. The experimental results show that when the gas sample with a volume frac...

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PUM

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Abstract

The invention relates to a detecting tube for low concentration hydrogen sulfide gas. Barium sulfate, silica gel or a mixture of the barium sulfate and the silica gel is used as a carrier; lead acetate solution and barium chloride solution are used as developing agents; glycerine is used as a wetting agent; and different detection indicators are obtained by controlling the dry condition. The hydrogen sulphide gas samples with different concentrations are introduced into the detecting tube, and the content of the hydrogen sulfide gas is determined according to the difference of the color changeof the developing agents. The detecting tube has simple structure, fast analysis, low cost and convenient carrying, and can detect weather the content of hydrogen sulfide in air of environment is over-proof at the field. The application experiment proves that the detecting tube has higher sensitivity and substantially meets the requirements of national standard.

Description

technical field [0001] The invention relates to the development of a trace hydrogen sulfide gas detection tube, including the selection of a carrier and an indicator, the treatment of different drying degrees on the carrier adsorbed with the indicator, and the control of the injection volume. Background technique [0002] Hydrogen sulfide is a colorless, highly toxic, strongly acidic gas. Hydrogen sulfide mainly comes from multiple production processes such as steel, oil refining, papermaking, fuel, pharmaceuticals, leather, etc. It also often appears in biogas digesters, coal mines, oil wells, sewers, sewage pools and other places. The toxicity of hydrogen sulfide is second only to cyanide, and it is a poisonous gas that is easy to cause death. Hydrogen sulfide not only seriously threatens people's lives, but also causes serious environmental pollution and severe corrosion damage to metal equipment. At the same time, hydrogen sulfide is an important raw material for refin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 金鑫贾红霞陈咏梅万平玉王梅英
Owner BEIJING UNIV OF CHEM TECH
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