SH/T 1844-2024 in English

VALID

Ethylene and propylene for industrial use – Determination ofhydrogen, carbon monoxide and carbon dioxide – Gas chromatography and helium ionization method

Issued on:2024-04-10
Implemented on:2024-10-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $190.00
$185.00

Standard No:	SH/T 1844-2024
Document status:	VALID
Title in English:	Ethylene and propylene for industrial use – Determination ofhydrogen, carbon monoxide and carbon dioxide – Gas chromatography and helium ionization method
Title in Chinese:	工业用乙烯、丙烯中痕量氢气、一氧化碳、二氧化碳的测定气相色谱-氦离子化检测法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2024-04-10
Implemented on:	2024-10-01
Professional Classification:	SH-Petrochemical
Related Keywords:	helium ionization detection technology helium ionization detector helium ionization method introduction technical background carbon dioxide – gas chromatography dc discharge helium ionization detector
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本文件规定了用气相色谱-氦离子化检测法测定工业用乙烯、丙烯中痕量氢、一氧化碳和二氧化碳的含量。本文件适用于测定工业用乙烯、丙烯中含量不低于0.05mL/m3的氢气和一氧化碳、不低于0.03mL/m3的二氧化碳。

Introduction

Technical background and significance of the standard

As the first special detection standard for trace H₂, CO, and CO₂ in ethylene/propylene in the petrochemical industry, SH/T 1844-2024 fills the gap in the detection of impurities in olefin raw gas in my country. The standard introduces the Pulsed Discharge Helium Ionization Detector (PDHID) and DC Discharge Helium Ionization Detector (DID) technologies, with a detection sensitivity of 0.03-0.05 mL/m³, which is an order of magnitude higher than the traditional method.

Method Principle and Technological Innovation

Technical Elements	Traditional Methods	This Standard Method	Advantage Comparison
Detection Principle	Thermal Conductivity Detector (TCD)	Helium Ionization Detector (PDHID/DID)	Sensitivity Improved by 10-100 Times
Chromatographic Column System	Single Column Separation	Multi-column Combination + Backflush Technology	Separation Efficiency Improved by 3 Times
Lower Limit of Quantitation	0.5 mL/m³	0.03 mL/m³	Meets the needs of high-end polyolefin production

Agilent 7890B chromatograph combined with PDHID detector in an ethylene plant shows that this standard method can accurately detect 0.04 mL/m³ of CO impurities in raw ethylene, helping the plant to adjust the catalyst activity in time and avoid abnormal polymerization reactions.

Analysis of key operating points

6.1 Instrument configuration requirements

The standard requires that the chromatographic system must be equipped with:

Gas injection valve (quantitative loop volume 0.25-2 mL)
Three-way independent carrier gas control system (pressure range 86-345 kPa)
Backflush and switching system (valve switching timing error ≤0.01 min)

8.2 Calibration specifications

The response value of the standard sample must meet the following requirements:

The peak area deviation between two measurements is ≤5%
Signal-to-noise ratio (S/N) ≥2
Dilution linearity must be verified when using a dynamic diluter (R²≥0.999)

Implementation suggestions and precautions

Laboratory preparation

Recommendations for building new detection capabilities:

Preferably choose the combination of polystyrene divinylbenzene column + 5A molecular sieve column
Carrier gas purifier needs to be equipped with an oxygen trap (O₂ content <0.1 ppm)
Establish a three-level standard sample system (high/medium/low concentration)

Key points for method validation

Must be verified before implementation of the standard:

Limit of detection (LOD): ≤80% of the nominal minimum detection limit
Repeatability: ≤120% of the value specified in Table 2
Sample stability: RSD of the measurement result within 4 hours ≤3%

Technology evolution trend

The helium ionization detection technology used in this standard may be applied to:

Miniaturized detectors (reducing helium consumption)
Intelligent valve control systems (automatically optimizing switching timing)
AI-assisted peak identification (eliminating interference from complex matrices)

More samples: QC/T 942-2021 JC/T 2453-2018 GB 18306-2015

Sample only — not a preview of SH/T 1844-2024

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