Determination of hydrocarbon impurities in industrial ethylene by gas chromatography (2)

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Figure 1 Sample import

Figure 2 Sample injection

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5 Reagents and materials

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Note: Compressed ammonia or nitrogen is a high-pressure gas,

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Note: Hydrogen is an extremely flammable high-pressure gas

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6 sampling

According to the technical requirements of GB/T 13289, if the liquid sample is taken, the corresponding gasification device should be used

7 Instrument preparation

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Column temperature: initial temperature: 35℃; initial temperature retention time: 2.

Split injection system: injection valve loop volume: 200uL～500uL, injection valve temperature: 35℃～45℃, split injector temperature: 150℃～200℃, split ratio: 50:1～100:1, FID temperature: 300°C, air: 300 mL/min, oxygen: 30 mL/min, makeup gas N ₂ , 20 mL/mnin

Sensitivity: Set at an appropriate value that can obtain the impurity measurement value

Splitless injection system: injection valve loop volume: 10uL～60uL, injection valve temperature: 35℃～45℃

Note: The heating of 1 Al ₂ O ₃ PLOT column should not exceed 200°C to prevent changes in column activity

2 The air and hydrogen flow parameters of FID can be determined according to the values ​​recommended by the instrument manufacturer
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2 When the instrument is stable, it can be analyzed
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