Analysis of COKE Gas

APPLICATION # 120

The Analysis

The GC is configured for the analysis of H₂, O₂, N₂, CH₄, CO, CO₂, C₂H₄, C₂H₆, and C₃H₈. Additionally, the GC will analyze for H₂S and COS if present. The limit of sensitivity for H₂S analysis in this system is about 0.10%. The GC is also configured to elute benzene in approximately 16 minutes.

How It Works

The GC is configured with two automated multiport valves. At the moment of injection, the sample is injected to two separate column trains. One micropacked column will separate H₂, O₂, N₂, CH₄, CO. The second column is a capillary column which will separate air (N₂, O₂, and CH₄) from the remaining components: C₂ hydrocarbons, H₂S, COS, and C₃H₈ hydrocarbons. The composite peak is not integrated. After the elution of propane, it is possible to heat the column oven to 200C and elute butanes and benzene. If this option is not exercised, these components will be backflushed to vent. The length of the columns has been chosen so as to send the components from each column to the detector, sequentially and without interference.

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