Slow pyrolysis dynamic method

Table 10.6 PE slow pyrolysis (dynamic method) characteristic parameters...

The following section reviews the literature data summarizing the behaviour during carbonization of five individual polymers, i.e. polyethylene (PE), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC) and polyethylene terephthalate (PET). Eor each polymer, results will first be presented for flash pyrolysis then for slow pyrolysis by the isothermal and dynamic methods. 

In slow pyrolysis, temperatures are generally lower than for flash pyrolysis, but residence time is longer. Meanwhile, there are two different methods. One method is the isothermal-static method where the charge is directly heated at a given temperature and maintained during a certain time while in the dynamic method (TGA) the charge is progressively heated. 

In slow pyrolysis by the dynamic method, the temperature domain is generally large and in this case, the main parameter is the heating rate. Table 10.6 indicates the temperature interval for the decomposition of the PE defined between the temperatures Ts and T95. These two temperatures are defined respectively as the temperature at which the conversion starts T5 at 5% conversion) and Tg (close to the end of conversion, at 95%). The maximum rate of conversion occurs between T5 and Tgs, at Tmax-... 

By slow pyrolysis, the dynamic method is more appropriate to estimate the decomposition interval for the polypropylene decomposition. Table 10.11 indicates the temperature interval for the decomposition of the PP defined between the temperatures and... 

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