Unlocking the Uses of Pyrolysis oil
Pyrolysis oil, often called bio-oil or tire/plastic-derived fuel, is emerging as a sustainable alternative to traditional fossil fuels. Produced through the thermal decomposition of waste materials such as plastics, tires, biomass, and oil sludge, this versatile liquid fuel is reshaping the energy landscape. From serving as a direct substitute for furnace oil and diesel in industrial boilers, to being refined into valuable chemicals or upgraded into transportation-grade fuels, pyrolysis oil offers both economic and environmental advantages. As industries worldwide search for cleaner, more efficient energy solutions, unlocking the full potential of pyrolysis oil is becoming a key step toward a circular economy.
1.Properties of Pyrolysis Oil from Different Feedstocks
2.Application of pyrolysis oil
3.How to Transforming Pyrolysis Oil into Advanced Fuels
4.Pyrolysis Oil as a Valuable Chemical Feedstock
6.Environmental Stewardship: A Core Advantage
7.Addressing the Roadblocks: Navigating the Path to Widespread Adoption
1.Properties of Pyrolysis Oil from Different Feedstocks>>>
This table provides a concise overview of the varied characteristics of pyrolysis oil based on its origin, illustrating why feedstock selection is crucial for intended applications.
Property | Biomass Pyrolysis Oil (Typical Range) | Plastic Pyrolysis Oil (Typical Range) | Tire Pyrolysis Oil (Typical Range) | Relevance/Implication |
Composition | Highly oxygenated (phenols, acids, ketones, aldehydes) | Aliphatics (PE/PP), Aromatics (PS) | High aromatics (e.g., limonene) | Dictates upgrading pathway & end-use |
Water Content | 15-30% | Low (less moisture in feedstock) | Marginal | Affects energy density, ignition, stability |
pH | 2.3-4.2 (acidic) | Not consistently specified, generally acidic if oxygenated | ~0.01 (very low acidity) | Corrosivity to equipment materials |
Total Acid Number (TAN, mg KOH/g) | 60-100 | Not consistently specified | 0. 01 | Corrosivity, upgrading requirement |
Viscosity (cSt at °C) | 20-1000 | ~1.98 (at 425 °C pyrolysis) | ~9 (at 40°C) | Pumpability, atomization in combustion |
Higher Heating Value (HHV, MJ/kg) | 17-18 | Up to 50.28 | Up to 47.36 | Energy content, fuel applicability |
Stability | Unstable, susceptible to aging | Variable, can be unstable | Generally stable, but can degrade | Storage, transport, and long-term use |
2.Application of pyrolysis oil>>>
One of the most immediate and impactful applications of pyrolysis oil is its use as a direct energy source, offering a renewable alternative to conventional fossil fuels in various industrial and power generation settings.
Industrial Boilers and Furnaces
Pyrolysis oil can directly substitute for natural gas, coal, or heating oil in medium to large-scale industrial boilers and furnaces. This application is considered straightforward, often requiring only limited investments for retrofitting existing systems. Necessary modifications typically include replacing the boiler burner with a multi-fuel burner capable of handling pyrolysis oil, potentially mixed with natural gas or heating oil, and ensuring that pipes and storage tanks are constructed from stainless steel to withstand the oil’s properties. The boiler itself generally does not require replacement.
The environmental benefits of this direct substitution are compelling. Using pyrolysis oil can lead to substantial reductions in carbon emissions, with reported savings of around 60% in greenhouse gas emissions compared to fossil fuel use. A notable example is the FrieslandCampina milk powder production site in Borculo, which saw its direct carbon emissions drop by 50% by replacing natural gas with renewable pyrolysis oil from the Empyro plant, saving million cubic meters of natural gas annually. This demonstrates a tangible shift towards more sustainable energy supply and reduced dependency on volatile fossil fuel prices. While pyrolysis oil is competitive with heating oil prices, its competitiveness against currently low natural gas prices in some regions remains a consideration.
Gas Turbines and Diesel Engines
Beyond static boilers, pyrolysis oil also holds promise for power generation in gas turbines and diesel engines, particularly for Combined Heat and Power (CHP) systems and decentralized energy solutions. These applications are especially valuable in remote locations or for large industrial companies seeking to produce their own electricity, heat, or steam. The potential extends to ship propulsion, where pyrolysis oil is emerging as a commercially attractive alternative to fossil fuels.
Successful tests have been conducted on stationary diesel engines, though some modifications are typically required, primarily to prevent damage to the engine and fuel system due to the oil’s water content and acidity. Similarly, a MW class OP16 gas turbine has been adapted to run on pyrolysis oil, with manufacturers now guaranteeing smooth operation after specific modifications to the combustion chamber. This opens up immediate possibilities for producing entirely green heat and power in diverse settings. While promising, some studies indicate that using waste plastic pyrolysis oils in gas turbines can lead to increased NOx emissions (e.g., -61% increase) and CO emissions (25% increase) compared to conventional fuels, alongside a slight reduction in thermal efficiency (5-10%). This highlights the ongoing need for process optimization and emission control strategies when integrating pyrolysis oils into these advanced power systems.
3.How to Transforming Pyrolysis Oil into Advanced Fuels>>>
While direct combustion offers immediate benefits, a significant area of development for pyrolysis oil involves upgrading it into higher-value transportation fuels such as gasoline, diesel, and jet fuel. This transformation is crucial for decarbonizing the transport sector and unlocking broader market opportunities.
Transportation Fuels
The conversion of pyrolysis oil into transportation fuels represents a strategic pathway for reducing reliance on virgin fossil resources. Plastic pyrolysis oil, with its inherently higher hydrocarbon content and lower oxygen levels compared to biomass oil, is particularly promising for yielding fuels that resemble conventional gasoline, diesel, and jet fuel. For instance, co-pyrolysis of waste tires and rice husk has been shown to produce liquid fuel with a heating value approaching that of diesel.
Upgrading Techniques
Due to the complex and often challenging properties of raw pyrolysis oil—such as high oxygen content, acidity, viscosity, and instability—various upgrading techniques are employed to enhance its quality and make it suitable for advanced fuel applications. These processes aim to increase the oil’s calorific value, improve its stability, and reduce its corrosivity.
Hydrotreating (Hydrodeoxygenation – HDO): This is a high-pressure chemical process that utilizes hydrogen in the presence of catalysts (e.g., Co-MoS2/Al2O3, Ru/C, NiMo sulfides). HDO effectively removes oxygen, nitrogen, and sulfur from the oil, while also saturating olefins and some aromatic compounds. This process significantly increases the calorific value, improves acidity, and reduces viscosity, ultimately yielding a high-grade oil product that closely resembles crude oil. The process involves reaction pathways such as cracking, decarbonylation, decarboxylation, hydrocracking, and hydrogenation, all contributing to a more refined fuel.
Catalytic Cracking: As an alternative to hydrotreating, catalytic cracking, often performed at atmospheric pressure, employs zeolite catalysts (e.g., HZSM-5) to deoxygenate pyrolysis oil. This method can produce a higher yield of aromatic hydrocarbons, such as toluene and xylenes, by significantly decreasing the yields of oxygenated compounds like acetic acid and phenols.
Emulsification: This physical upgrading method improves the low solubility of pyrolysis oil in hydrocarbon fuels. By mixing pyrolysis oil with diesel and surfactants, a more stable mixture is achieved, which in turn enhances fuel properties like calorific value, pH, and overall stability. Optimal stability is often achieved with specific proportions of pyrolysis oil (10–20 wt%), diesel (50–90%), and surfactants (1–10%), sometimes with the addition of co-surfactants like alcohols.
Esterification: This chemical process specifically targets the corrosive carboxylic acids present in pyrolysis oils, transforming them into more stable esters through reactions with alcohols (e.g., methanol or ethanol), often with the aid of zeolite-supported catalysts. Esterification effectively reduces the acid number, density, and water content of the bio-oil while simultaneously increasing its calorific value, making it more suitable for combustion engines.
Challenges in Upgrading
Despite the significant potential, the upgrading of pyrolysis oil to advanced fuels faces several technical and economic hurdles.
Catalyst Deactivation: A major challenge is the deactivation of catalysts, primarily due to coking (carbon deposition), poisoning by nitrogen and sulfur compounds, and metal deposition. This phenomenon significantly limits catalyst lifetime, often to less than 0 hours for some systems, necessitating frequent regeneration or the development of more robust catalysts. Addressing this issue is critical for the long-term economic viability of upgrading processes.
Hydrogen Consumption: Hydrotreating processes, while highly effective, demand substantial quantities of hydrogen. The cost and sustainable sourcing of this hydrogen significantly impact the overall economics and environmental footprint of the upgrading pathway.
High Pressure and Temperature Requirements: Many upgrading processes, particularly hydrotreating, operate under demanding conditions of high pressure (e.g., -300 bar) and elevated temperatures (e.g., 0-400 °C). These severe operating conditions contribute to high capital expenditures (CAPEX) and operational costs (OPEX) for upgrading facilities.
Table : Pyrolysis Oil Upgrading Methods and Their Benefits
This table summarizes various upgrading methods and their impact on pyrolysis oil properties, highlighting how each technique contributes to enhancing its suitability for advanced fuel applications.
Upgrading Method | Primary Purpose | Key Benefits | Challenges/Considerations |
Hydrotreating (HDO) | Deoxygenation, desulfurization, denitrogenation, saturation of unsaturates | Increases calorific value, improves acidity & viscosity, enhances stability, produces crude-oil-like product | High hydrogen consumption, high pressure/temperature, catalyst deactivation (coking, poisoning) |
Catalytic Cracking | Deoxygenation, production of aromatics (BTX), reduction of oxygenates | Can operate at atmospheric pressure, produces valuable chemicals, improves fuel quality | Extensive carbon deposition, very short catalyst lifetimes, lower H/C ratio in product |
Emulsification | Improve solubility in hydrocarbon fuels, enhance stability | Increases calorific value, improves pH, enhances stability, acts as lubricant | Requires specific surfactant ratios, potential for phase separation, thermal stability differences |
Esterification | Reduce acidity by converting carboxylic acids to esters | Reduces acid number, density, water content; increases calorific value; improves viscosity | Requires alcohols (e.g., methanol), further improvement in calorific value may be needed |
4.Pyrolysis Oil as a Valuable Chemical Feedstock>>>
Beyond its role as a fuel, pyrolysis oil is increasingly recognized for its potential as a versatile chemical feedstock, offering a sustainable pathway to produce a wide array of industrial chemicals that are traditionally derived from fossil resources.
Aromatics (Benzene, Toluene, Xylenes – BTX)
Benzene, toluene, and xylenes (BTX) are fundamental aromatic compounds with immense industrial importance, serving as precursors for polymers, pharmaceuticals, solvents, and various consumer products. Traditionally, BTX production relies heavily on catalytic reforming of naphtha or extraction from pyrolysis gasoline derived from steam crackers. However, catalytic pyrolysis, particularly of polyolefin-rich plastic waste, is emerging as a highly promising and sustainable route for BTX synthesis.
This method leverages the inherent hydrocarbon content of plastics to yield valuable aromatics. For instance, studies have demonstrated BTX yields of up to . weight percent from polypropylene using a double-fluidized-bed reactor with catalysts. Similarly, fractions of biomass pyrolysis liquid enriched in phenolics have achieved BTX yields of 80% (on a carbon and dry basis) through catalytic upgrading with zeolites like H-ZSM-5. Zeolite catalysts are particularly effective due to their high aromatization performance, stemming from their acidity and specific pore structures. The development of advanced reactor designs, such as multi-stage fluidized beds, further optimizes these processes for efficient BTX production.
Specialty Chemicals
Beyond the high-volume BTX aromatics, pyrolysis oil can also serve as a source for a range of specialty chemicals. Biomass-derived pyrolysis oil, with its complex mixture of oxygenated compounds, is particularly rich in precursors for chemicals such as phenols, acetic acid, and furfural. Phenol, for example, is a key intermediate in the production of phenolic resins and pharmaceuticals. The production of specific chemicals like acetic acid and furfural from bio-oil is already close to or in a full commercial state. Furthermore, fractionation techniques can isolate phenolic and polyphenolic compounds with antioxidant properties from bio-oil, demonstrating its potential for high-value applications beyond fuels.
Fractionation and Selective Catalytic Pyrolysis
The diverse and complex chemical composition of pyrolysis oil necessitates sophisticated processing to isolate desired compounds. Fractionation, through methods like solvent extraction or distillation, plays a crucial role in separating the oil into different chemical families or molecular weight ranges. This allows for targeted upgrading or direct extraction of specific chemicals. For example, solvent extraction can remove waxes and fatty acids, while liquid-liquid extraction can separate pyrolytic sugars and lignin streams, which can then be further processed to yield specific byproducts like mono-phenolics.
Simultaneously, advancements in selective catalytic pyrolysis are enabling direct control over the product distribution. By employing specific catalysts and optimizing pyrolysis conditions, it is possible to favor the formation of desired chemical outputs. This integrated approach, combining tailored pyrolysis with subsequent fractionation or catalytic upgrading, maximizes the value recovery from waste feedstocks and positions pyrolysis oil as a flexible platform for the sustainable chemical industry.
5.Emerging Horizons>>>
The applications of pyrolysis oil continue to expand beyond traditional fuel and chemical uses, with innovative research exploring its potential in diverse sectors, including infrastructure and advanced materials.
Asphalt Modification and Rejuvenation
Bio-oils derived from biomass are emerging as promising alternatives for partially replacing or modifying asphalt binders in road construction. The incorporation of bio-oil into asphalt can enhance pavement performance by improving rutting resistance at high temperatures and stiffness at low temperatures, while simultaneously reducing susceptibility to low-temperature cracking. This not only reduces the carbon footprint of road infrastructure but also promotes the utilization of renewable resources.
Furthermore, pyrolysis oil, particularly from tires, can act as a rejuvenating agent for aged asphalt. This application supports a circular economy within the road industry by mitigating the negative effects of conventional bitumen aging and meeting future needs for sustainable road maintenance. Biochar, a co-product of pyrolysis, can also be used as a bitumen modifier, strengthening the chemical structure of bitumens and even exhibiting anti-aging properties.
Bioplastics and Advanced Materials
Pyrolysis-derived materials are finding applications in the production of high-quality bioplastics and advanced materials, demonstrating their ability to meet demanding industry standards without compromising quality or safety. This includes the use of recycled plastics from pyrolysis in food-grade packaging, such as pet food containers and snack packaging, representing a significant market opportunity. The medical and pharmaceutical industries also benefit from these materials, utilizing them in medical device packaging and pharmaceutical containers. This development illustrates how pyrolysis contributes to a circular economy for plastics, transforming end-of-life waste into valuable resources for critical applications.
6.Environmental Stewardship: A Core Advantage>>>
The environmental benefits of pyrolysis oil are a cornerstone of its growing appeal, offering compelling solutions to pressing global challenges related to waste management and climate change.
Waste to Resource Transformation
Pyrolysis plays a crucial role in diverting diverse waste streams—including end-of-life plastics, tires, and agricultural residues—from landfills and incineration. This transformation of waste into valuable resources directly addresses global waste crises, including the pervasive issue of marine plastic pollution, by creating economic incentives for waste collection and processing. The technology’s ability to handle mixed plastic waste streams that traditional mechanical recycling methods cannot process further expands the range of recyclable materials, significantly reducing the volume of waste destined for disposal.
Greenhouse Gas (GHG) Mitigation
A significant environmental advantage of pyrolysis is its potential for substantial greenhouse gas mitigation. The conversion of plastic waste into pyrolysis oil can decrease carbon dioxide (CO2) emissions by -75% compared to incineration. Furthermore, the process helps prevent the release of potent greenhouse gases like methane (CH4) and CO2 that would otherwise be generated from the decomposition of organic waste in landfills. Studies indicate that pyrolysis can offset up to .-4 tonnes of CO2 equivalent per tonne of waste processed, positioning it as an effective tool for climate change mitigation when managed responsibly.
Circular Economy Catalyst
Pyrolysis is a powerful catalyst for the circular economy, enabling the return of “dirty, degraded mixed plastic waste back into circulation” as prime quality materials. This contrasts with conventional waste-to-energy processes that primarily recover energy without material circularity. By replacing virgin fossil resources in plastic production, pyrolysis oil significantly reduces the carbon footprint of new plastic products. This process reduces dependency on finite fossil resources and supports the Environmental, Social, and Governance (ESG) objectives of corporations. The growing adoption of sustainability certifications, such as ISCC PLUS, further enhances transparency and traceability in the supply chain, ensuring low-carbon sourcing for global brands and reinforcing the circularity principle. This creates long-term contracting opportunities between pyrolysis providers and major chemical players, solidifying the circular economy model.
7.Addressing the Roadblocks: Navigating the Path to Widespread Adoption>>>
While the potential of pyrolysis oil is immense, its widespread adoption necessitates addressing several technical and economic challenges.
Challenges Posed by Oil Properties
The inherent properties of pyrolysis oil present significant hurdles. Its high acidity and corrosivity, particularly for biomass-derived oils, demand the use of specialized materials like stainless steel for storage tanks and piping to prevent equipment damage. The substantial water content, especially in bio-oils, reduces energy density and can negatively impact ignition characteristics, requiring careful management or pre-treatment. High viscosity can impede pumpability and atomization in combustion systems, while its inherent instability leads to aging, increased viscosity, and solid formation over time, complicating long-term storage and transport. These combined characteristics mean that careful material selection, process design, and often, upgrading steps are essential for successful implementation.
Emissions Profile and Control
The combustion of pyrolysis oil, like any fuel, generates emissions that require diligent management to comply with environmental regulations.
Overview of Emissions: Exhaust gases from pyrolysis and subsequent combustion can contain various air pollutants, including particulate matter (PM), volatile organic compounds (VOCs), carbon monoxide (CO), nitrogen oxides (NOx), and sulfur oxides (SOx).
Specific Emission Trends:
NOx: Studies present variable findings regarding nitrogen oxide emissions. Some research indicates increases, particularly when using waste plastic pyrolysis oils in gas turbines, attributed to higher combustion temperatures. However, other studies report ambiguous changes or even decreases, suggesting that factors like ignition delay and peak temperature can influence NOx formation.
CO: Carbon monoxide emissions are often found to be comparable to or even reduced when burning pyrolysis oil compared to conventional fossil fuels. This reduction can sometimes be linked to the residual oxygen content within the pyrolysis oil, which promotes more complete oxidation during combustion.
PM: Particulate matter emissions are generally reported to be higher when combusting pyrolysis oil compared to light fuel oil. This necessitates effective PM control measures to meet stringent air quality standards.
SOx: Sulfur oxide emissions are directly correlated with the sulfur content of the feedstock used for pyrolysis.
VOCs: Volatile organic compounds are present in the exhaust gases, with their specific composition varying based on the feedstock properties and the precise pyrolysis conditions employed.
Emission Control Strategies: Comprehensive strategies are being developed and implemented to manage these emissions effectively.
Feedstock Pre-treatment: Proper pre-treatment of biomass (drying, particle size reduction) is essential to optimize the pyrolysis process and minimize potential emissions.
Catalytic Pyrolysis and Upgrading: The integration of catalysts during the pyrolysis process or subsequent upgrading steps can significantly improve the quality of the oil and lead to cleaner combustion, thereby reducing emissions.
Flue Gas Treatment: Advanced air pollution control systems are crucial for managing emissions from pyrolysis oil combustion:
Wet Scrubbers and Electrostatic Precipitators (ESPs): These technologies are highly effective for particulate matter removal.
Baghouse Filters: These are another effective technology for capturing particulate matter.
Desulfurization: To meet environmental limits on sulfur, methods like oxidative desulfurization have shown high effectiveness, removing up to -93.% of sulfur from tire pyrolysis oil.
VOC Control: Technologies such as adsorption, catalysis, photocatalysis, and thermal oxidizers are employed to reduce volatile organic compound concentrations in waste gases.
Table : Comparative Environmental Impact: Pyrolysis Oil vs. Fossil Fuels (Key Emissions)
This table provides a comparative overview of key emissions when combusting pyrolysis oil versus conventional fossil fuels, illustrating the varying environmental considerations and the importance of control technologies.
Pollutant | Pyrolysis Oil Combustion (Typical Trends/Levels) | Fossil Fuel Combustion (General Comparison) | Emission Control Strategies |
CO2 (GHG) | 50-75% reduction vs. incineration ; Net-positive for GHG reduction | Significant contributor to GHGs | Waste-to-resource, circular economy, replacing virgin fuels |
NOx | Increased (26-61% for WPPO in gas turbines) ; Ambiguous/variable | Significant contributor, especially from vehicle exhaust | Process optimization, catalytic upgrading, combustion air control |
CO | Comparable or reduced ; Meets EPA standards (e.g., . ppm) | Significant contributor from incomplete combustion | Optimized combustion, residual oxygen in fuel |
Particulate Matter (PM) | Higher than light fuel oil ; Can exceed EPA limits (e.g., mg/m³ vs. mg/m³) | Significant contributor | Filtration, wet scrubbers, electrostatic precipitators (ESPs), baghouse filters, catalytic upgrading |
SOx | Dependent on feedstock sulfur content | Significant contributor from sulfur-rich fuels | Desulfurization (oxidative, extractive), flue gas desulfurization (FGD) |
VOCs | Present (few ppm to hundreds ppm) | Significant contributor, especially from cooking/vehicles | Catalysis, adsorption, photocatalysis, thermal oxidizers, optimizing pyrolysis conditions |
8.The Future is Bright: Market Dynamics and Innovation>>>
The trajectory for pyrolysis oil is one of significant growth and expanding influence, driven by compelling market dynamics and continuous innovation.
Market Trends and Growth
The global pyrolysis oil market is experiencing robust expansion, with its size projected to grow from approximately USD .-2.0 billion in 2025 to an estimated USD . billion by , reflecting a compound annual growth rate (CAGR) of .-9.%. This substantial growth is primarily fueled by the increasing demand for renewable fuels, the escalating global plastic waste crisis, and the broader transition towards a circular economy. Companies across the transportation, chemical, and power sectors are actively exploring pyrolysis oil as a viable alternative to traditional fossil fuels.
Regionally, Asia Pacific currently dominates the pyrolysis oil market, while North America is anticipated to exhibit the fastest growth during the forecast period. In terms of feedstock, the plastic segment held the largest market share in , and the rubber segment is projected to experience the fastest growth, driven by rising amounts of automotive rubber waste and strict global regulations concerning tire disposal. Flash pyrolysis, a process optimized for liquid yield, generated the major market share by process type in .
Investment and Innovation Drivers
The market’s momentum is significantly bolstered by supportive regulatory frameworks and growing investments. Governments, particularly in regions like the European Union and North America, are promoting circular economy policies and implementing bans on landfilling plastic waste, which directly incentivizes investments in pyrolysis technologies. There is a notable trend towards decentralized waste-to-energy systems, which offer advantages in cost reduction and reduced environmental impact compared to centralized approaches.
Corporate pressures to decarbonize supply chains and meet Environmental, Social, and Governance (ESG) objectives are also driving substantial investment. Corporations are increasingly investing in chemical recycling to lessen their dependency on virgin crude oil. This includes major chemical players entering into long-term off-take agreements with pyrolysis providers, indicating a maturing market and confidence in the technology. Continuous research and development efforts are focused on improving reactor design, developing more effective and durable catalysts, and enhancing process integration to maximize efficiency, yield, and product quality. The growing availability of ISCC PLUS-certified pyrolysis oil further supports traceable, low-carbon sourcing, making it an increasingly attractive option for global brands.
9.Conclusion>>>
Pyrolysis oil stands as a testament to human ingenuity in transforming challenges into opportunities. From its fundamental role as a direct energy source in industrial boilers and engines to its sophisticated conversion into advanced transportation fuels and valuable chemical feedstocks, its applications are both diverse and expanding. This versatility is deeply rooted in the ability of pyrolysis technology to process a wide array of organic waste materials, yielding a liquid product whose characteristics can be tailored by feedstock selection and process optimization.
The environmental benefits of pyrolysis oil are profound, offering a tangible pathway to address global waste crises and mitigate greenhouse gas emissions. By diverting waste from landfills and incineration, and by providing a renewable alternative to fossil fuels, pyrolysis actively champions the principles of a circular economy. This transformation not only reduces environmental burdens but also creates new economic value from discarded resources.
While challenges remain, particularly concerning the inherent properties of crude pyrolysis oil and the management of emissions, continuous innovation is steadily overcoming these hurdles. Advances in upgrading technologies, catalyst development, and sophisticated emission control systems are enhancing the quality and applicability of pyrolysis oil, making it increasingly competitive and environmentally sound. The robust growth projections for the pyrolysis oil market, coupled with increasing investments and supportive regulatory frameworks, underscore a clear trajectory towards widespread adoption. Pyrolysis oil is not merely a substitute; it is a transformative resource poised to play a pivotal role in shaping a more sustainable, resource-efficient, and circular future for industries worldwide.
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