Techno-Economic Assessment of a Closed-Loop Circular Economy for Polylactic Acid

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Global demand for polylactic acid (PLA), a biodegradable plastic, is rapidly increasing.
• Growing PLA production and consumption present significant waste management challenges.
• Transitioning to a circular plastic economy necessitates innovative recycling solutions.

Purpose of the Study:

• To evaluate techno-economic feasibility of three distinct PLA waste recycling processes.
• To identify optimal conditions for sustainable and cost-effective PLA recycling.
• To promote the shift from a linear to a circular plastic economy.

Main Methods:

• Techno-economic simulations were conducted for seven different recycling scenarios.
• Investigated the direct conversion of methyl lactate to lactide in the gas phase.
• Evaluated the performance of a TiO2/SiO2 catalyst in PLA recycling.

Main Results:

• The proposed recycling method using a TiO2/SiO2 catalyst increased PLA yield by 59.87%.
• This process demonstrated a cost reduction of 22.87% compared to conventional methods.
• Catalyst selection proved critical for activity and selectivity in methyl lactate conversion.

Conclusions:

• The TiO2/SiO2 catalyzed process offers a sustainable and economically viable solution for PLA waste recycling.
• Optimizing catalyst performance is key to enhancing the efficiency of PLA recycling.
• This research supports the development of a circular plastics economy and environmentally friendly alternatives.