GB/T 35212.1-2017 in English
VALIDAnalysis and evaluation methods of gas and solution and desulfurization decarbonization and sulfur recovery for natural gas treating plant-Part 1:Gas and solution analysis
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$815.00
《GB/T 35212.1-2017天然气处理厂气体及溶液分析与脱硫、脱碳及硫磺回收分析评价方法 第1部分：气体及溶液分析》由TC244（全国天然气标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
| Analysis items | Method principle | Determination range | Reference standard |
|---|---|---|---|
| Hydrogen sulfide content | Iodometric method/methylene blue method/gas chromatography | 0.05%-100% | GB/T 11060 series |
| Carbon dioxide content | Potassium hydroxide absorption subtraction method | 0.1%-100% | Chapter 6 of this standard |
| Sulfur mist determination | Filtration weighing method | 0.5-10g/m³ | Chapter 10 of this standard |
Evolution of key technologies
This standard integrates traditional chemical analysis methods with modern instrumental analysis methods:
- Chemical method: retain the classic iodine titration (hydrogen sulfide) and neutralization titration (carbon dioxide) to ensure the reliability of basic data
- Instrumental method: newly added gas chromatography (process gas analysis) and ultraviolet fluorescence method (total sulfur determination) to improve analysis efficiency
Typical application cases
Determination of low concentration hydrogen sulfide in purified gas
A natural gas purification plant adopts Molybdenum blue spectrophotometry (Chapter 5.2) Monitor 0-25mg/m³ hydrogen sulfide in purified gas:
- Prepare ammonium molybdate colorimetric solution (3.4.1.10)
- Select sampling volume according to Table 1 (1-10L)
- Control the absorption flow rate at 200-300mL/min
- Measure absorbance at a wavelength of 600nm
The relative standard deviation of this method is ≤10% (when H₂S＞5mg/m³)
Implementation suggestions
Key points for safety protection
- All hydrogen sulfide analyses must comply with SY/T 6137 safety regulations
- Positive pressure respirators are required for acid gas sampling
- The laboratory should be equipped with H₂S alarm device
Quality control measures
- Monthly calibration of standard solution (Clause 3.4.2)
- Aging of chromatographic column every 3 months (8.4.3.4)
- Relative deviation control of parallel samples (repeatability requirements of each chapter)
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