Chemical recycling of mixture of waste plastics using a new reactor system with stirred heat medium particles in steam atmosphere

Influence of nanocrystalline HZSM-5 external surface on the catalytic cracking of polyolefins

“…The simplest method of plastic feedstock recycling is thermal cracking which proceeds with low yields towards the corresponding raw monomers giving a complex mixture of products with low value as raw chemicals and mainly useful as fuel [3][4][5]. However, by plastic cracking over different solid catalysts it is possible to obtain products with higher commercial value and with a wider number of applications [6][7][8].…”

Thermal decomposition of individual and mixed plastics in the presence of CaO or Ca(OH)2

“…Comparatively higher yields of nC 15 and nC 17 compounds, which could be identified as styrene dimers, were observed. In the presence of CaO and steam, nC 9 yields decreased to 72.6 wt% with slightly increasing yields of nC 6 -nC 11 compounds. In addition, the total liquid yield decreased, while the unidentified carbon yield increased to 23.0 C%.…”

“…Zhou et al [9] investigated the dechlorination ability of Al-Mg oxide composites on the pyrolysis of PVC-containing olefin plastics, and reported a dechlorination rate of 93 wt%. Masuda et al reported a suppression of the formation of sublimating substances from the pyrolysis of PET and PET-containing mixed-plastics in the presence of iron oxyhydroxide (FeOOH) [10,11]. The effect of calcium based catalysts (Ca-C), obtained by the calcination of calcium carbonate (CaCO 3 ) and phenol resin, on the degradation of PET and PVC-containing mixedplastics was also investigated by Bhaskar et al, [8,12] resulting in a maximum oil dechlorination of 99%, increased oil yield, and suppression of the formation of sublimating substances.…”

Effect of HZSM-5 catalyst addition on the cracking of polyolefin pyrolysis waxes under FCC conditions

“…The main problem of the fluidized reactor is bed defluidization, which is caused by agglomeration of sand particles (inert material) coated with melted polymer [19,20]. To solve this problem, innovative reactors aimed at avoiding particle fusion have been proposed [21][22][23]. Amongst these reactors, the conical spouted bed reactor (CSBR), of simple design, avoids defluidization provoked by particle agglomeration [24].…”