Determination of trace carbon monoxide, carbon dioxide and acetylene in ethylene and propylene for industrial use. Gas chromatography (2)

5 Instruments

5.

Note: It is not necessary to connect a nickel reformer to determine acetylene

Figure 1 Connection diagram of ten-way valve in sampling and backflushing state

Note: It is not necessary to connect a nickel reformer to determine acetylene

Figure 2 Connection diagram of the ten-port valve in the sampling state

5.

5.

The nickel catalytic hydrogenation column is prepared as follows: Weigh 200g of nickel nitrate and dissolve it in 90mL of distilled water, add 80g of 6201 chromatographic support or other suitable support, boil (5-10) min, cool, filter, and place the support in an evaporating dish Dry it at 105°C, then place it on an electric stove to slowly heat (should be in a fume hood) until the red-brown nitrogen dioxide is exhausted.

Note: Standard samples should be used to check the reactivity of the nickel catalytic hydrogenation column on a regular basis

5.

Table 1 Chromatographic columns and typical operating conditions for the determination of carbon monoxide and carbon dioxide

Table 2 Operating conditions of nickel catalytic hydrogenation column

Figure 3 Typical chromatograms of ethylene and propylene standard samples on TDX-01 packed column

Figure 4 Typical chromatogram of ethylene and propylene standard sample on Carbonbond capillary column

Table 3 Chromatographic column for acetylene analysis and typical operating conditions

Figure 6 Typical chromatograms of ethylene and propylene standard samples on Carbonbond capillary column