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Detection method and device of trace hydrogen chloride in hydrogenation device gaseous phase

A hydrogen chloride, trace technology, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as large errors, achieve high detection limits, be beneficial to environmental protection, and reduce harm.

Inactive Publication Date: 2019-11-12
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the detection tube method has a large error in the determination of trace amounts of hydrogen chloride.

Method used

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  • Detection method and device of trace hydrogen chloride in hydrogenation device gaseous phase
  • Detection method and device of trace hydrogen chloride in hydrogenation device gaseous phase
  • Detection method and device of trace hydrogen chloride in hydrogenation device gaseous phase

Examples

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Effect test

example 1

[0041] Taking the hydrogen after the dechlorination tank in the reforming unit as the collection object, the concentration of hydrogen sulfide is less than 50ul / L, prepare a sodium hydroxide solution with a molar mass fraction of 0.001mol / L, add 1 drop of phenolphthalein indicator solution, and pipette Pipet 10ml of sodium hydroxide solution into a 10ml porous glass plate absorption bottle. Connect the sampler to the flowmeter, adjust the valve, control the gas volume flow rate to 0.8L / min, remove the flowmeter and directly connect the sampling port with a silicone tube, and connect two porous glass absorption bottles and a wet flowmeter in series to collect the gas The time was 40 minutes, and the content of chloride ions was measured by ion chromatography. After calculation, the content of trace hydrogen chloride in hydrogen gas was 0.378uL / L, and the repeatability was 0.988 after three parallel measurements.

example 2

[0043] Take the hydrogen after the dechlorination tank in the reforming unit as the collection object, the concentration of hydrogen sulfide is less than 50ul / L, prepare a sodium hydroxide solution with a molar mass fraction of 0.01mol / L, add 1 drop of phenolphthalein indicator solution, and pipette Take 10ml of sodium hydroxide solution in a 10ml porous glass plate absorption bottle, connect the sampler and flowmeter, adjust the valve, control the gas volume flow rate to 0.8L / min, remove the flowmeter and directly connect the sampling port with a silicone tube, and connect them in series Two porous glass plate absorption bottles and wet flowmeters, the time of gas collection is 40min, and the content of chloride ions is determined by ion chromatography. After calculation, the content of trace hydrogen chloride in hydrogen is 0.438uL / L, and the parallel measurement is performed three times. Repeat The sex is 0.991.

example 3

[0045] Taking the hydrogen after the dechlorination tank in the reforming unit as the collection object, the concentration of hydrogen sulfide is less than 50ul / L, prepare a sodium hydroxide solution with a molar mass fraction of 0.1mol / L, add 1 drop of phenolphthalein indicator solution, and pipette Take 10ml of sodium hydroxide solution in a 10ml porous glass plate absorption bottle, connect the sampler and flowmeter, adjust the valve, control the gas volume flow rate to 0.8L / min, remove the flowmeter and directly connect the sampling port with a silicone tube, and connect them in series Two porous glass plate absorption bottles and wet flowmeters, the time of gas collection is 40min, and the content of chloride ions is measured by ion chromatography. After calculation, the content of trace hydrogen chloride in hydrogen is 0.440uL / L, and the parallel measurement is performed three times. Repeat The sex is 0.985.

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Abstract

The invention relates to a detection method and device of trace hydrogen chloride in hydrogenation device gaseous phase. The method comprises the following steps: analyzing content of acid gas H2S ina sample point material; preparing a sodium hydroxide solution according to the concentration of the acid gas H2S, wherein the mole mass fraction is 0.01-1.0mol / L; transferring the configured sodium hydroxide solutions into two porous glass board absorption bottles by utilizing transfer pipettes, connecting a sampling port through a silicon tube, regulating the gas volume flow as 0.1-3.0L / min, andthe gas collection time is 10-70min; taking out the absorption liquid in two porous glass board absorption bottles, and determining the chloride ion content in the absorption liquid by utilizing ionchromatography, and computing the trace hydrogen chloride content in the hydrogen. High-temperature, high-pressure and high H2S dangerous sampling conditions of the hydrogenation device can be avoided, the dangerous gas in the sample is absorbed, the damage on the personnel is reduced, the determination result is more accurate, the solvent is treated in a centralized manner, and the detection limit is comparatively high.

Description

technical field [0001] The invention relates to a method and a device for detecting trace amounts of hydrogen chloride in the gas phase of a hydrogen-facing device. Background technique [0002] With the increase of sulfur and chlorine content in crude oil, the sulfur and chlorine content of reforming unit and hydrogenation unit will increase. The hydrogen produced by the reforming unit provides a hydrogen source for the downstream hydrogen-facing device. The HCl gas produced by the reforming reaction is taken out of the device along with the hydrogen product, and passes through the dechlorination tank to the downstream hydrogen-facing device. HCl will seriously corrode the equipment. Therefore, hydrogen is required The HCl content in the solution should be less than 0.5μl / L. The chlorine content in the raw material and circulating hydrogen of the hydrogenation device increases, which leads to intensified corrosion of the equipment, and the hydrogenation device is a high-te...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/86
CPCG01N30/02G01N30/06G01N30/8675
Inventor 崔蕊张宝忠孙学锋侯志忠刘嫘孙建国韩仿王彤剧海峰
Owner CHINA PETROLEUM & CHEM CORP
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