SH/T 1483-2020 in English
VALIDC. olefins for industrial use - Determination of trace oxy- compounds - Gas chromatographic method
- Issued on:2020-12-19
- Implemented on:2021-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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本标准规定了用气相色谱法测定工业用碳四烯烃中的微量含氧化合物含量。
本标准适用于工业用碳四烯烃中微量二甲醚、甲基叔丁基醚、甲醇和叔丁醇等含氧化合物的测定，其最低测定浓度为0.0001%（质量分数）。
Introduction
Core changes in the standard revision
| Revision dimensions | 2004 edition | 2020 edition |
|---|---|---|
| Standard integration | SH/T 1483 and SH/T 1547 are separated | Dual standards are merged and unified |
| Chromatographic column configuration | Old type packed column | CP-Lowox capillary column (0.53mm×10m) |
| Lower detection limit | 0.0005% | 0.0001% |
Key technical points
Instrument configuration requirements
It is necessary to configure hydrogen flame ionization detector (FID), the purity of carrier gas nitrogen is ≥99.99%, and the temperature is programmed (80℃→200℃@10℃/min). The quantitative tube of the liquid injection valve is 1μL, and the quantitative loop of the gas injection valve is 0.5mL.
Typical application cases
A petrochemical enterprise uses this standard to detect the methanol content in 1-butene:
- Standard sample concentration: 0.0012% (mass fraction)
- Measured peak area: 18563±523 (n=5)
- RSD=2.8%
Analysis of implementation difficulties
Vaporization device selection: The new version deletes the small amount of liquid sample vaporization device, and requires the use of flash evaporator, which needs to ensure:
- Vaporization temperature ≥150℃
- System inertization treatment (to prevent methanol adsorption)
- Pipeline insulation measures
Quality control requirements
| Control items | Frequency | Acceptance criteria |
|---|---|---|
| Standard sample verification | Each batch of samples | Peak area deviation ≤5% |
| Blank test | Daily | No interference peak at the component to be tested |
Background of standard evolution
With the expansion of the application of C4 olefins in high-end fields such as MTBE and butyl rubber, the control requirements for oxygen-containing compounds have been increased from ppm level to ppb level. The 2020 version achieves a 5-fold improvement in detection accuracy by:
- using a high-sensitivity capillary column
- optimizing the vaporization system
- adding a quality control chapter
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