What types of plastic can pyrolysis?

                                       Waste plastic pyrolysis plant


Plastics are classified into seven groups and products are identified by a number marked on product. Industry (SPI) defined a resin identification code system that divides plastics into the following seven groups based on the chemical structure and applications.

                          Waste plastic pyrolysis plant can process


HDPE, LDPE, PP and PS are all hydrocarbons consisting entirely of carbon and hydrogen, which are similar to hydrocarbon fuels such as liquefied petroleum gas (LPG), petrol and diesel. Plastics are derived from petroleum and have calorific values in a similar range as those of LPG, petrol and diesel as given in Table 2 [5].

Not all plastics are suitable for pyrolytic conversion. The main branch of convertible plastics are known as polyolefins and comprise the following:

    High density polyethylene (HDPE)
    Low density polyethylene (LDPE)
    Polystyrene
    Polypropylene (PP)

PET and PVC are not considered suitable for this process because of low yields and acid production. PET is normally mechanically recycled and is seen as a valuable feedstock for other processes. In 2015 some 170 000 t of polyolefin was handled by the recycling business in South Africa. This represents a potential 150 000 l of diesel fuel
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