Chemical Recycling PET Technology – Full price table (02/11/2026 →09/11/2026)

Chemical Recycling PET Technology

The Challenge of Global Plastic Waste and Traditional Recycling Limitations

Polyethylene terephthalate (PET) is among the most widely consumed synthetic polymers on the planet. Valued for its transparency, structural strength, and barrier properties, PET forms the backbone of global beverage packaging, synthetic textiles, and industrial food containers. However, the vast volume of post-consumer plastic waste poses severe environmental challenges, filling landfills and polluting terrestrial and marine ecosystems worldwide.  Chemical Recycling PET Technology

For decades, the plastic industry has relied predominantly on mechanical recycling to manage post-consumer waste. While mechanical sorting, shredding, and remelting provide a short-term solution, the process inherently degrades polymer chain integrity over time. Thermal stress during reprocessing shortens the polymer chains, resulting in lower-quality material that eventually becomes unsuitable for high-grade packaging applications. Consequently, mechanical recycling acts as a downcycling delay rather than a true closed-loop circular solution.  Chemical Recycling PET Technology

Conventional chemical recycling pathways—such as high-temperature pyrolysis, gasification, or aggressive thermal depolymerization—offer an alternative by breaking polymers down into original monomeric building blocks. However, these traditional thermo-chemical routes suffer from steep energy requirements. Operating reactors at temperatures exceeding several hundred degrees Celsius incurs heavy financial costs and generates substantial carbon emissions, offsetting the environmental benefit of recycling. Chemical Recycling PET Technology

To overcome these structural limitations, global material scientists are turning toward low-temperature catalytic systems capable of depolymerizing waste polymers under ambient or mild conditions without sacrificing monomer yield or purity.  Chemical Recycling PET Technology

Photothermal Catalysis: A Low-Energy Breakthrough by South Korean Researchers

In response to the urgent demand for sustainable depolymerization methods, a research team led by Professor Jung-Ki Ryu from the Ulsan National Institute of Science and Technology (UNIST) Department of Energy and Chemical Engineering, in collaboration with Professor Soo-Jin Park’s team at POSTECH, has engineered a chemical recycling technology. Their novel approach utilizes photothermal catalysis—combining light absorption and low-level heat—to convert waste PET directly into solid terephthalic acid (TPA) and gaseous ethylene.

Unlike conventional energy-intensive chemical methods that require extreme heat and pressure, this system operates effectively at a mild 50°C under simulated sunlight. The reaction environment places pulverized PET powder alongside a specialized catalyst inside a dilute aqueous solution of sulfuric acid.  Chemical Recycling PET Technology

+-----------------------------------------------------------------------+
|                     UNIST/POSTECH REACTION PROCESS                    |
+-----------------------------------------------------------------------+
| Input Materials: Waste PET Powder + Dilute Sulfuric Acid Solution    |
| Catalyst Composition: Porous Silicon + Carbon Nanomaterial + Cobalt   |
| Operating Conditions: Low Heat (50°C) + Simulated Solar Irradiation   |
+-----------------------------------------------------------------------+
                                   |
                                   v
+-----------------------------------------------------------------------+
|                           REACTION YIELDS                             |
+-----------------------------------------------------------------------+
| Polymer Conversion Rate: 73.2% (24-Hour Experimental Standard)       |
| Primary Recovered Products:                                           |
|   - Solid Phase: Terephthalic Acid (TPA) -> Up to 91.4% (Real Waste)   |
|   - Gas Phase:   Ethylene Gas            -> Up to 39.1% Yield         |
+-----------------------------------------------------------------------+

The core innovation lies within the structural architecture of the catalyst. The research team fabricated the catalyst by coating porous silicon particles with a conductive carbon-based nanomaterial integrated with cobalt species. Porous silicon offers an exceptionally high surface area for light absorption and chemical contact, while the carbon-cobalt surface layer facilitates thermal conduction and accelerates chemical bond cleavage across the polymer backbone. Upon absorbing light, the catalyst converts solar photon energy into localized thermal energy, accelerating polymer degradation right at the catalytic surface while maintaining low bulk fluid temperatures.  Chemical Recycling PET Technology

Performance Benchmark: Lab Trials vs. Real-World Plastic Waste

During controlled 24-hour baseline experiments using standardized PET powder, the photothermal catalytic system achieved a total polymer conversion rate of 73.2%. The chemical reaction yielded 69.4% solid terephthalic acid and 39.1% gaseous ethylene, proving that light-assisted catalysis can successfully break strong ester bonds in synthetic polymers under mild operating parameters.

To verify whether the technology could handle real-world contamination and additives, the joint research team conducted performance testing on actual post-consumer plastics. They evaluated two common waste streams: standard transparent drinking bottles and dark-colored black food containers. Post-consumer plastics often contain dyes, additives, and structural modifiers that typically poison catalysts or impair optical reactions in light-driven processes.  Chemical Recycling PET Technology

Remarkably, real-world post-consumer waste delivered higher yields of solid terephthalic acid than the initial baseline laboratory powder. Transparent PET bottles produced a TPA yield of 91.4%, while opaque black food containers yielded 90.8% TPA. Black plastics are historically notorious in mechanical and optical sorting streams because carbon black pigments absorb infrared light and interfere with standard sorting equipment; however, in this photothermal catalytic process, darker materials actually facilitate solar heat absorption, enhancing localized catalytic activity.  Chemical Recycling PET Technology

Industrial Significance: Closing the Loop in Petrochemical Value Chains

The dual output of solid terephthalic acid and gaseous ethylene creates direct integration opportunities for global petrochemical supply chains. Chemical Recycling PET Technology

Terephthalic acid serves as one of the primary precursors used worldwide in virgin PET synthesis. By recovering high-purity solid TPA from low-temperature chemical degradation, resin manufacturers can feed recovered monomers directly back into polymerization reactors without requiring fossil fuel-derived aromatics such as paraxylene. This creates a closed-loop monomer-to-monomer pathway that produces new, food-contact-grade plastic resins indistinguishable from petroleum-derived virgin resins.  Chemical Recycling PET Technology

                 +-----------------------------------+
                 |    Post-Consumer Waste Plastics   |
                 | (Bottles, Colored Containers, etc)|
                 +-----------------------------------+
                                   |
                                   v
                 +-----------------------------------+
                 | UNIST Low-Temp Photothermal Reactor|
                 |  (50°C + Solar Light + Catalyst)  |
                 +-----------------------------------+
                                   |
                +------------------+------------------+
                |                                     |
                v                                     v
   +--------------------------+         +--------------------------+
   |   Solid Phase Output     |         |    Gas Phase Output      |
   | Terephthalic Acid (TPA)   |         |      Ethylene Gas        |
   +--------------------------+         +--------------------------+
                |                                     |
                v                                     v
   +--------------------------+         +--------------------------+
   | Virgin-Grade PET Resin   |         | Polyolefins, Solvents,   |
   | Packaging & Textiles     |         | Industrial Feedstocks    |
   +--------------------------+         +--------------------------+

Simultaneously, ethylene gas represents one of the most fundamental building blocks of modern industrial chemistry. Ethylene serves as the base monomer for manufacturing polyethylene (HDPE and LDPE), vinyl chloride for PVC, ethylene oxide, and various industrial solvents. Capturing gaseous ethylene from waste streams diversifies the economic value of recycling facilities, transforming plastic waste into a versatile feedstock for chemical manufacturing sectors beyond polyester packaging alone.  Chemical Recycling PET Technology

Engineering Challenges and Commercialization Requirements

While the laboratory results demonstrate exceptional monomer recovery, scaling photothermal chemical recycling into a commercially viable industrial technology requires solving specific downstream engineering challenges.  Chemical Recycling PET Technology

First, product isolation and purification downstream from the reactor require capital-efficient processing steps. Solid terephthalic acid precipitates out of solution alongside small fractions of unreacted PET particles. Industrial facilities will need continuous solid-state separation technology to filter out residual polymers and guarantee pure monomer quality before repolymerization.

Second, the gas stream produced during photothermal catalysis contains both ethylene and small volumes of hydrogen gas generated by secondary reactions in the acid medium. Efficient gas separation membrane systems or cryogenic distillation units will be necessary to isolate pure ethylene for commercial sale while harvesting hydrogen as a clean secondary byproduct.

Finally, scaling up photothermal reactors requires optimizing light penetration through dense slurry mixtures.  Chemical Recycling PET Technology

Unlike clear liquid solutions, industrial-scale plastic slurries require specialized reactor geometries—such as thin-film solar reactors, microfluidic channels, or internal fiber-optic lighting networks—to ensure artificial or natural solar radiation reaches all catalyst-coated particles uniformly.  Chemical Recycling PET Technology

As UNIST and POSTECH researchers refine continuous-flow processing parameters, verifying economic viability against virgin monomer prices remains the final hurdle for industrial adoption. If scaled successfully, photothermal catalysis offers a scalable, low-carbon pathway to eliminate ocean plastic pollution, reduce industrial energy consumption, and build a truly sustainable circular economy for global polymer industries. Chemical Recycling PET Technology

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