Low temperature conversion of plastic waste into light hydrocarbons

Area of Science:

• Chemical Engineering
• Materials Science
• Environmental Science

Background:

• Plastic waste management is a significant global challenge.
• Pyrolytic technology offers a promising avenue for advanced plastic recycling.
• Developing energy-efficient reactors is crucial for sustainable plastic waste processing.

Purpose of the Study:

• To design and test a locally manufactured, energy-efficient batch reactor for plastic waste pyrolysis.
• To evaluate the yield of pyrolytic products from waste polyethylene using the developed reactor.
• To compare the efficacy of catalytic versus non-catalytic pyrolysis processes.

Main Methods:

• A 1-liter volume, energy-efficient batch reactor was fabricated.
• Waste polyethylene (50 g) was used as feedstock for pyrolysis.
• Pyrolysis was conducted at temperatures of 275°C (non-catalytic) and 250°C (catalytic).
• Product yields (pyrolytic oil, wax, pyrogas, char) were quantified.

Main Results:

• Non-catalytic pyrolysis at 275°C yielded: 48.6% pyrolytic oil, 40.7% wax, 10.1% pyrogas, and 0.6% char.
• Catalytic pyrolysis at 250°C yielded: 47.98% pyrolytic oil, 35.43% pyrogas, 16.09% wax, and 0.50% residue (char).
• The reactor demonstrated effectiveness in producing valuable products under both catalytic and non-catalytic conditions.

Conclusions:

• The designed batch reactor is capable of efficient plastic waste pyrolysis.
• Similar product yields can be achieved at lower temperatures without a catalyst.
• This technology presents a viable option for the advanced recycling of plastic waste.