Chromatographic separation processes: gas chromatography

Principle

Installing a gas separation column in the glass jacket creates an educationally vivid set-up for demonstrating the main operating principles of a gas chromatograph while at the same time achieving good separation in the low-temperature range of up to 100°C. Dinonyl phthalate on diatomaceous earth is used as the separating agent.
Helium is used as the mobile phase. A soap bubble flow meter is used to set and monitor the flow velocity.
A thermal conductivity detector is used for detection. The signals are passed along via a control unit for recording on a Yt recorder or to an interface.
To control the temperature of the gas separation column, the glass jacket is connected to the external circuit of a circulation thermostat.
This set/up makes it possible to separate both gas mixtures and liquid mixtures.
If an interface for recording the signals is to be used instead of the Yt recorder shown here, the recorder must be replaced with the following equipment:

- Cobra3 Chem unit (12153-00)

- Power supply 12 VDC/2 A (12151-99)

- Software Cobra3 Chem unit (14520-61)

Literature for this article als follows

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