Jll

ferromagnetic wire

Figure 14. Schematic diagram of the Curie-point wire/reaction tube assembly located within the high frequency coil.

Figure 14. Schematic diagram of the Curie-point wire/reaction tube assembly located within the high frequency coil.

effect") is balanced by the loss of heat through radiation and conduction (ref.

104). Temperature/time profiles for wires of different ferromagnetic materials, when using a Fischer Labortechnik 1.5 kW, 1.1 MHz h.f. power supply, are shown in

Figure 15. Intermediate curves can be obtained by using various alloys of these ferromagnetic materials. At 600°C, typical degradation reactions in polymers are completed in less than milliseconds (ref. 105). Therefore, even with temperature-

rise times (ty) in the millisecond range, pyrolysis will be complete at temperatures well below 600°C.' As a consequence, it is not surprising that changing Te^ from 510

to 610°C does not drastically influence the pyrolysis patterns of biopolymers such as glycogen and albumin (refs. 100, 101). For the same reason, changing the total heating time (t ) from 0.3 to 1.2 s also does not cause appreciable changes in these patterns (refs. 100, 101). However, a very low T , e.g. below 400°C, may cause eq drastic changes in pyrolysis patterns. This is explained by the fact that at these

Was this article helpful?

0 0

Post a comment