High-temperature liquefaction of waste plastics

A step-by-step model for pyrolysis kinetics of polyethylene in an autoclave under non-linear increase of temperature

“…Therefore, differently from the work [17], their trivial con- tribution was not examined individually but regarded as undegradated PE or coke. The experimental results in Fig.…”

“…Ramdoss and Tarrer [17] have studied kinetics of liquefaction of commingled post-consumer plastics in a 50-ml tubing bomb micro-reactor in the range 475-525 • C at 790 kPa (cold) hydrogen pressure. The process was considered to be isothermal as the reactor was brought to the desired temperature approximately in 4 min after immersion in a sand bath.…”

Thermal and Catalytic Conversion of Polyolefins

“…Inorganic compounds in waste plastics are contained in the different types of additives and impurities (product remains). The total content of mineral components in waste plastics (approximate analysis) attains value 0.5-1 wt% (ash) [2,3]. In our waste cracking experiments studies some PE samples selected from municipal wastes contained ∼0.6 while PS even more than 3 wt% of inorganic components [4].…”

“…The reduced hydrogen content in waste plastics, e.g. 13.7 wt% [2,3] is a result of some oxygen or nitrogen content (admixture of PET or PA), inorganic components or PS (7.69 wt% H 2 content). Depending on the origin the hydrogen content in crude oil is 11-14 wt% [5].…”

“…On the basis of kinetics analysis the authors concluded that cracking of polymers such as PE occurs to a greater extent near the end of the polymer chain rather than in the middle of it [2]. Comparative studies of thermal and catalytic PP cracking indicate a strong influence of catalyst on total conversion in the temperature range 340-380…”