HG/T 6281-2024 in English
VALIDTest method for catalyst activity of propylene oxidation to acrolein
- Issued on:2024-03-29
- Implemented on:2024-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$310.00
| Standard No: | HG/T 6281-2024 |
| Document status: | VALID |
| Title in English: | Test method for catalyst activity of propylene oxidation to acrolein |
| Title in Chinese: | 丙烯氧化制丙烯醛催化剂活性试验方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2024-03-29 |
| Implemented on: | 2024-10-01 |
| ICS Classification: | 71.100.99-Other products of the chemical industry |
| Chinese Classification: | G74-Basic standards and general methods for catalyst |
| Professional Classification: | HG-Chemistry |
| Related Keywords: | propylene oxidation
propylene conversion rate activity calculation model propylene conversion formula raw propylene propylene explosion |
Introduction
Background and evolution of standard technology
As an important supplement to the catalyst evaluation system in the chemical industry, this document establishes a standardized test method for catalysts for propylene oxidation to acrolein. Compared with the early non-standard tests, the main technological breakthroughs are reflected in:
| Comparison dimension | Traditional method | HG/T 6281-2024 |
|---|---|---|
| Reactor temperature control accuracy | ±5℃ | ±1℃ (isothermal zone) |
| Parallelism control | Not specified | ≤0.5%Range |
| Safety specification | Simple protection | System sealing detection + explosion-proof design |
Core test principle
Based on propylene in class=instrument>Selective oxidation reaction under the action of Mo-Bismuth-Iron catalyst:
C3H6 + O2 → C3H4O + H2O
The accurate quantitative analysis of reactants and products is achieved by gas chromatography dual detector technology (FID+TCD).
Key Instruments and Materials Specifications
6.1 Gas Chromatograph
- Must be equipped with a dual detection system: hydrogen flame detector (FID) to analyze organic products, thermal conductivity detector (TCD) to monitor inorganic gases
- Chromatographic column selection: combination of HP-AL/S capillary column (gas analysis) and FFAP packed column (liquid analysis)
7.2 Reaction Device Parameters
| Parameter Item | Indicator Requirements |
|---|---|
| Reaction Tube Material | 316L Stainless Steel (Acid Corrosion Resistant) |
| Isothermal Zone Length | ≥200mm |
| Maximum operating temperature | 500℃ (actual use 315℃) |
Standardized operation points
9.3 Activity determination process
- Gas path control: Propylene space velocity is strictly maintained at 120h-1 (30mL/min feed)
- Absorption system: n-butanol absorption liquid needs to be replaced regularly (200mL every 2 hours)
- Termination condition: The extreme difference of propylene conversion rate is ≤0.5% for three consecutive times
10.4 Activity calculation model
Propylene conversion formula: E=(npp-npp')/npp×100%
Wherein, npp is the molar flow rate of raw propylene, and npp' is the molar flow rate of tail gas propylene
Implementation suggestions
Safety protection
- An explosion-proof ventilation system must be equipped (propylene explosion limit 2-11%)
- It is recommended to use an online oxygen concentration monitoring and alarm device
Key points of quality control
- Regularly calibrate the mass flowmeter (Appendix C Flow Calibration)
- The frequency of retesting retained samples shall be ≥1 time/year (Clause 7.3)
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