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Method for measuring trace chlorobenzene in hydrogen chloride gas

A hydrogen chloride gas, hydrogen chloride technology, applied in measuring devices, instruments, scientific instruments and other directions, can solve the problem of inability to detect trace amounts of chlorobenzene and high detection limit of chlorobenzene, achieve short detection time, lower detection limit, avoid damage effect

Inactive Publication Date: 2014-07-02
SHANGHAI BASF POLYURETHANE +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of high detection limit, inability to detect trace amounts of chlorobenzene, and inapplicability to strongly acidic background medium in the method for measuring chlorobenzene in the prior art, and to provide a method for measuring chlorobenzene in gas. The method and pretreatment method for the determination of trace amounts of chlorobenzene in hydrogen chloride gas without damage to the detection instrument, and the detection limit can be as low as ppb level

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  • Method for measuring trace chlorobenzene in hydrogen chloride gas
  • Method for measuring trace chlorobenzene in hydrogen chloride gas

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Embodiment 1

[0031] (1) Pretreatment method: Use a 250mL steel cylinder to collect a hydrogen chloride sample at a certain pressure from the production device. Prepare 287.77g of 0.75mol / L sodium hydroxide aqueous solution to absorb hydrogen chloride gas (excess sodium hydroxide), and add 2-3 drops (0.15mL) of acetone at the same time. Immerse the outlet end of the cylinder containing hydrogen chloride into the bottom of the absorbing liquid, and open the cylinder. Fine-tune the valve switch so that the gas in the bottle is slowly discharged, which can be absorbed by the lye and discharged from the liquid surface without bubbles, so as to ensure that chlorobenzene is not lost due to being carried out of the absorption liquid by hydrogen chloride. After about 20 minutes, the absorption is completed to obtain an absorption liquid.

[0032] (2) The method of measuring trace amount of chlorobenzene in hydrogen chloride gas: take 5mL of absorption liquid, first pass through purging and trappin...

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Abstract

The invention discloses a method for measuring trace chlorobenzene in hydrogen chloride gas, and a pretreatment method thereof. The pretreatment method comprises the following steps: dissolving a hydrogen chloride gas sample into an alkaline water solution, and evenly mixing the alkaline water solution with acetone so as to obtain an absorption liquid; wherein the alkaline contains enough moles of alkaline substances to totally neutralize the hydrogen chloride in the hydrogen chloride gas, and the volume of acetone is more than or equal to 0.1 mL for each 300 mL of the alkaline water solution. The method comprises the following steps: subjecting the absorption liquid to a purge and trap treatment, and then carrying out gas chromatography-mass analysis. The method is harmless to detection instrument, and the detection limit can reach a ppb grade.

Description

technical field [0001] The invention relates to a method for measuring trace amounts of chlorobenzene in hydrogen chloride gas. Background technique [0002] In the prior art, to measure the chlorobenzene content in the gas, the method of adsorption tube can generally be used to sample, and gas chromatography is used to measure the chlorobenzene in the gas, specifically: using Al 2 o 3 / KCl, FID detector, under high flow rate (10mL / min), chlorobenzene peaks out in about 40 minutes, relatively speaking, the peak time is relatively late, and the detection limit is generally at the ppm level. [0003] If you want to sample and measure chlorobenzene in hydrogen chloride gas, since the high-concentration hydrogen chloride is the background gas, it has strong acidity and has a strong interaction with the adsorption tube, which will instantly saturate the adsorption tube and make sampling impossible. Even if the sampling is successful, the strongly acidic hydrogen chloride backgr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/08
Inventor 吴克旻王毅于正一贾培世朱莉娅·莱斯钦斯基
Owner SHANGHAI BASF POLYURETHANE
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