Industrial Propylene-Determination of Hydrocarbon Impurities-Gas Chromatography (2)

5 Instruments

5.

Gas chromatograph with temperature program function and flame ionization detector (FID)

5.

The chromatographic column recommended by this standard and typical operating conditions are shown in Table 1, and the typical chromatogram is shown in Figure 1

Table 1 Chromatographic column and typical operating conditions

5.

5.

Any liquid sampling valve that can meet the following requirements can be used; under the vapor pressure of propylene not lower than the operating temperature, it can repeatedly inject propylene in liquid form and meet the chromatographic separation requirements

The flow diagram of the liquid sampling device is shown in Figure 2

Figure 2 Schematic diagram of the flow of the liquid sampling device

5.

Gas sampling uses the small amount of liquid sample vaporization device shown in Figure 3 to completely vaporize the sample to ensure the representativeness of the sample

First, unload the sample cylinder with a volume of about 1700mL at E and apply a vacuum (<0.

Connect the evacuated sample cylinder to E, first open valve A, then open valve B, so that the liquid sample is completely vaporized in the sample cylinder

Note: The sampling cylinder containing the liquid sample should be placed in the laboratory for sufficient time to allow the temperature of the liquid sample to reach the room temperature before performing the above operations

Figure 3 Schematic diagram of a small amount of liquid sample vaporization device

5.

Any integrator or chromatographic data acquisition system that can meet the determination requirements can be used
.