Industrial isobutane (HC-600a) (5)

4.

4.

4.

Close the outlet valve of the standard gas cylinder.

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Where

A _{air —the} air peak area;

Φ _air —The volume fraction of air concentration in the standard gas, and the value is expressed in %

Take the arithmetic mean of the two parallel determination results as the determination result, and the relative deviation of the two determination results shall not exceed 1.

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4.

Before measuring the sample, record the temperature of the environment where the sample is located to the nearest 1°C, which is the temperature of the liquid phase of the sample

Connect the gas outlet valve of the sample cylinder to the inlet of the injection valve of the gas chromatograph.

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Continuously repeat the sample injection until the measured air peak area is repeated, and take the arithmetic average of the parallel determinations as the peak area measurement result

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4.

Where:

A _i —the peak area of ​​air;

f _air — the absolute correction factor for air

4.
7.
6.
2 Corrected to be the volume fraction Φ ₂ of the non-condensable gas content in the gas phase at 25°C , the value is expressed in %, calculated according to formula (7):

Where:

Φ ₁ —The volume fraction of the non-condensable gas content in the gas phase at room temperature, and the value is expressed in %;

P—The value of the saturated vapor pressure of the sample at the sampling environment temperature T (℃), in kilopascals (kPa), the value is found in Appendix C;

T—The value of the ambient temperature of the sample at the time of sampling, in degrees Celsius (°C);

P ₂₅ - value of the sample at saturation vapor pressure at 25 ℃, kilopascals (kPa), the value is obtained from the Appendix C apricots
.

Take the arithmetic mean of the continuous measurement results as the measurement result, and the relative deviation of the continuous measurement results shall not exceed 10%
.

4.
8 Determination of high boiling point residues

According to the regulations of SY/T7509
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Measure 100 mL of the sample and test it at a temperature of 38°C in a water bath
.

4.
9 Determination of vapor pressure

According to the provisions of GB/T6602
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Related Links: Industrial Isobutane (HC-600a) (4)