Aplied Pyrolysis Handbook by Thomas P. Wampler

By Thomas P. Wampler

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2 HEATED FILAMENT PYROLYZERS Isothermal furnaces achieve a fairly fast sample heating by keeping the pyrolysis instrument hot and injecting samples into it. Heated filament pyrolyzers take the opposite approach in that the sample is placed directly onto the cold heater, which is then rapidly heated to pyrolysis temperature. Commercially, two heating methods are used: resistance heating, in which a controlled current is passed through the heating filament, and inductive heating, in which the current is induced into the heating filament, which is made of a ferromagnetic metal.

Point pyrolyzers have controls for the parameters of the pyrolysis wire and also temperature selection for the interface chamber housing the wire. 2 Sample Introduction To capitalize upon the very rapid heating rates possible using the Curie-point technique, the sample and wire should be kept to a low mass. The technique is best suited to the analysis of samples that may be coated onto the filament as a very thin layer. Soluble materials may be dissolved in an appropriate solvent and the wire dipped into the solution.

First, it permits the examination of materials and how they are affected by slow heating, duplicating processes such as thermogravimetric analysis (TGA). Second, it permits the interface of spectroscopic techniques with constant scanning for three-dimensional, timeresolved thermal processing. 6 Disadvantages of Resistively Heated Filament Pyrolyzers The main disadvantage of a resistively heated pyrolyzer results from the fact that the filament must be physically connected to the controller. The temperature control of a resistively heated filament is based on the resistance of the entire filament loop, including the filament and its connecting wires.

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