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.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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