6-6
Ver.1.36
6.1.2.2 Solvent cleaning
When a large amount of material is pyrolyzed, the upper part of the tube (A in Fig. 6.2) may be
contaminated with high boiling compounds. After cooling the furnace to room temperature, the
contamination is removed by rubbing the inner wall of the tube with a cotton swab dampened with a
solvent as shown in the figure below. If this is-situ method fails to achieve the desired results, the
quartz pyrolysis tube must be removed from the pyrolyzer, and cleaned, following the instruction given
in section 6.1.2.3
6.1.2.3 Flame cleaning with a torch
For your safety, this operation must be done in a designated place. Because the very hot quartz
pyrolysis tube needs to be handled, heat-resistant gloves and safety goggles must be worn while
working.
(1) As shown in Fig. 6.3, red-heat the quartz pyrolysis tube. This can be done most effectively while
flowing air through the tube.
(2) Cool down the heated pyrolysis tube in a secured place. Allow 15 min to cool the tube to room
temperature since you cannot tell whether it is still hot by just looking at it.
Fig. 6.3 Heating with a torch
Fig. 6.3 Heating with a torch
Fig. 6.3 Heating with a torch
Fig. 6.2 In situ cleaning of the pyrolysis tube
When using a flame, make sure there is no flammable materials around
and work only in a well-ventilated area. Wear safety goggles for your
safety.
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