Thermal and catalytic decomposition of polyethylene and polypropylene

Catalytic flash pyrolysis of HDPE in a fluidized bed reactor for recovery of fuel-like hydrocarbons

“…Domestic plastic wastes typically contain 57 wt% of polyolefins, 14% of poly(vinyl chloride), 19 wt% of polystyrene, 5 wt% of other plastics and paper, and 5 wt% of inorganic materials (additives) [7]. The main polyolefin present in these wastes is polyethylene [8][9][10] and the development and implementation of a tertiary recycling method for this material would be of great importance.…”

“…This is why thermal pyrolysis requires a high temperature for the rupture process. If the catalyst is present in the reaction vessel, the degradation process takes place at a lower temperature than the thermal pyrolysis [8,13,15].…”

“…In the literature, several papers studying the thermal liquid fraction obtained from the polymer pyrolysis [8,11,13,[22][23][24][25][26] as well as that obtained from catalytic polymer decomposition [18,20,[27][28][29][30][31][32] can be found. In general, the information shown in these papers is limited to the global yield of non-volatile compounds, total alkane or total alkene yields.…”

Study of the polymer–catalyst contact effectivity and the heating rate influence on the HDPE pyrolysis

“…Pyrolysis, and catalytic pyrolysis mainly, are included in this group of methods [1,4,[5][6][7][8], whose results depend on the process parameters. There exists a large amount of literature about polymer pyrolysis under different conditions, such as type of reactor, temperature or catalyst employed.…”

A factorial experimental design for oxidative thermal decomposition of low-density polyethylene waste

“…There are various routes [5,6,8,9] including thermal degradation to regain some chemicals from this. Thermal decomposition may be carried out with or without solvent, oxidative, reductive, or inert media [5].…”