Sofia Martinez
Converting plastic into oil is a process that aims to reduce landfill waste and offer an alternative to fossil fuels. The concept is not new, but past attempts have faced challenges with safety, economics, and industrial accidents. The process involves breaking down long polymer molecules into shorter chains of hydrocarbons through pyrolysis, applying intense heat and pressure. This results in usable oil that can be further refined into gasoline or other fuels. Some companies have emerged as pioneers in this field, such as Agilyx, which has successfully converted plastic waste into crude oil. The success of this technology relies on its ability to work on a large scale, generate value, and benefit the environment, producers, and consumers alike.
| Characteristics | Values |
|---|---|
| Method | Pyrolysis, HiCOP |
| Process | Heat and pressure are used to break down long polymer molecules into shorter chains of hydrocarbons |
| Temperature | 380–450°C |
| Catalysts | Attached to the plastic's surface |
| Output | Crude oil, gasoline, diesel, naphtha |
| Benefits | No harmful pollutants, by-products can be used as fuel, environmentally sensitive |
| Efficiency | 80-90% feedstock converted |
| Commercial Viability | $50-$60 per barrel of converted oil |
| Applications | Transportation fuel, boilers, powering heavy machinery, energy for remote areas |
| Companies | Envion, John Bordynuik Inc. (JBI), Dow Chemical Company, Agilyx, Environment Energy Co. |
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Pyrolysis
The pyrolysis of plastics can be done with different types of plastics, such as polyethylene, polystyrene, and polyvinyl chloride (PVC). It can be carried out with individual types of plastics or a mix of different plastics to produce a diverse range of products. The main products of plastic pyrolysis are light oil, medium oil, heavy oil, and sludge.
The process can be improved by using catalysts, such as ZSM-5, zeolite, Y-zeolite, FCC, and MCM-41. These catalysts help break down the plastic material bonds and convert them into hydrocarbon gases, which are then concentrated into crude oil. The pyrolysis oil produced has properties similar to clean fuel and can be used as an alternative to fresh fossil fuels for power generation, transport, and other applications.
While pyrolysis offers a potential solution to plastic waste management and fossil fuel consumption, it is not without its challenges. Pyrolysis facilities are energy-intensive, and corrosion and fouling are common issues due to the nature of pyrolysis oil. The high costs, limited technology, and feedstock availability also affect the scalability of pyrolysis operations. However, companies like Stellar 3 have developed efficient pyrolysis technologies, and organizations like Alfa Laval are working to improve the process's efficiency, cost-effectiveness, and safety.
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Catalysts
The process of converting plastic to oil involves breaking down long polymer molecules into shorter chains of hydrocarbons. This can be achieved through pyrolysis, a process that involves applying intense heat in reactors.
One commonly used catalyst in the conversion of plastic to oil is the ZSM-5 zeolite catalyst. This catalyst has strong acidic properties and a microporous crystalline structure, which enables increased cracking and isomerization. This leads to a greater breakup of larger molecules into smaller ones, resulting in a higher yield of oil. Studies have shown that this catalyst can produce a maximum oil output of up to 70%.
Other catalysts used in the process include commercial ZSM-5, mordenite, and gamma alumina. These catalysts are tested for their performance in pyrolysis experiments, with the goal of optimizing the yield and quality of the crude oil produced.
Additionally, researchers from Swansea University have developed a method that utilizes a light-absorbing photocatalyst added to the plastic material. This mixture is then placed in an alkaline solution and exposed to sunlight, converting the plastic into hydrogen fuel.
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Mechanical recycling
The process of mechanical recycling begins with the collection of waste plastics, which are then compressed into a moulded state and transported to a recycling plant. At the plant, the plastics are crushed and melted using an extruder, and pressure is applied. The melted plastic is then moulded into new products.
One of the key challenges of mechanical recycling is the cost and feasibility of sorting different types of plastics. It is also a costly process as it involves picking up, sorting, and melting the plastic, which degrades the quality of the plastic with each reuse, limiting its reuse to only once or twice.
Another disadvantage of mechanical recycling is that it cannot handle mixed-material plastics, which are common in food packaging and other applications. As a result, the use of recycled materials in these areas is restricted.
Despite these challenges, mechanical recycling plays a significant role in Japan's plastic waste processing and is expected to continue as a dominant method in the future.
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Chemical recycling
Plastic-to-oil chemical recycling is a method to recycle used plastic by breaking it down into raw material oil that can be reused as feedstock for new plastics. This process can recycle mixed-material plastics, reducing the labour required for sorting. It is also possible to recycle them into high-quality chemicals that meet the same standards as brand-new products.
The Mitsubishi Chemical Group (MCG Group) has established a chemical recycling plant at the Ibaraki Plant in Kashima, in collaboration with ENEOS Corporation, to promote the plastics-to-oil conversion business. REFINVERSE Group, Inc. collects and procures used plastics as the raw materials for the chemical recycling plant. The recycled oil produced through chemical recycling is then used as a raw material in ENEOS’s oil refining facilities and the MCG Group’s naphtha crackers, where it is reprocessed into petroleum products and various chemical products.
The process of converting plastic to oil typically involves pyrolysis, a process of applying intense heat in reactors to break down plastic molecules. However, pyrolysis has received criticism due to its sustainability concerns, high energy requirements, and past industrial accidents.
A more recent method, developed by Environment Energy Co. and known as HiCOP, uses catalysts already employed in petroleum refining to break down plastic molecules into lighter molecules, such as gasoline. This process can handle dirty plastic waste and a mixture of different types of plastics, achieving a quality equivalent to virgin materials. The oil produced through HiCOP has reduced wax content, enhancing its fluidity and making it particularly advantageous during winter.
Another chemical recycling technology is hydrothermal treatment (HTT), which involves using water to heat and dissolve mixed plastics under supercritical conditions. HTT does not produce the same toxic combustion products as pyrolysis and offers higher product yields. However, HTT is a newer technology that requires further parameter tuning before commercialisation.
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Plastic waste liquefaction
A novel method called HiCOP, developed by Environment Energy Co., uses catalysts already employed in petroleum refining to convert waste plastic into oil. This oil can then be used to create 'virgin' plastic. The process involves attaching catalysts to the plastic's surface and applying temperatures of 380–450°C. This breaks the plastic into smaller pieces, eventually converting them into hydrocarbon gases, which are then concentrated into crude oil. The resulting oil is abundant in gasoline and diesel, as well as naphtha, a raw ingredient for plastic.
Direct liquefaction of waste plastics is another method that has been investigated, using various catalysts, temperatures, gases, pressures, times, and solvents. A solid acid catalyst, such as HZSM-5 or Al2O3SiO2, improves oil and total liquid yields. For medium and high-density polyethylene (PE), temperatures of 430°C or higher are required for good yields, while polypropylene (PPE) gives excellent yields at 420°C.
Hydrothermal pretreatment, including a steam-explosion process, can be used to separate mixed waste into organic and inorganic substances. Polystyrene and high-density polyethylene can be converted into oil through liquefaction at 300°–400°C. Increasing the liquefaction temperature to 350°C and the holding time to 60 minutes enhances the conversion of mixed waste to oil.
Overall, plastic waste liquefaction offers a promising technique to eliminate harmful waste and reduce dependence on fossil fuels. It provides an opportunity to increase the amount of plastic recycled and obtain raw materials for new plastics.
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Frequently asked questions
The process of converting plastic to oil involves breaking down long polymer molecules into shorter chains of hydrocarbons with the help of heat and pressure. This can be done through pyrolysis, a process of applying intense heat in reactors to break down plastic molecules.
The benefits of converting plastic to oil include reducing landfill waste and reducing dependence on foreign oil sources. Additionally, the process can produce valuable fuels and solvents such as gasoline, kerosene, diesel, benzene, toluene, and xylene.
The amount of plastic waste required to produce a significant amount of oil varies depending on the technology and process used. However, on average, each ton of waste plastic can produce approximately 3 to 5 barrels of crude oil.
