Implementation

Figure 1 shows a schematic flow diagram of a typical preparative GC. Typical values of temperatures and pressures are given at different points of the process. The range of operating temperatures and pressures used is given in Table 1.

Note that the pressure at the outlet condensers can be subatmospheric. This feature is used to increase the productivity of some separations when the vapour pressure of the sample at the operating temperature is too low. The use of vacuum raises a number of technical problems and should be avoided whenever possible.

Figure 1 Schematic diagram of a large scale preparative GC. 1, Chromatographic column; 2, detector; 3, valves for trap selection; 4, condensers; 5, gas-liquid separators; 6, fraction collectors; 7, recycled fraction pump; 8, carrier gas cleaner; 9, compressor; 10, carrier gas pre-heater; 11, injector; 12, feed vaporizer; 13, feed reservoir; 14, automation.

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Solar Panel Basics

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