Omar Khalid
Plastic is a versatile material that has become integral to modern life. It is used in everything from packaging to automotive parts. Plastic is derived from fossil fuel-based petrochemicals such as crude oil, natural gas, or coal. However, with the growing demand for oil reserves, newer plastics are being manufactured from renewable materials such as corn, cotton, and other biological substances. The raw materials used to produce plastics are mostly found in the natural world and include cellulose, natural gas, salt, and crude oil. Plastics are organic materials, and they are created by linking chains of molecules called monomers to create a large molecule or polymer.
| Characteristics | Values |
|---|---|
| Plastic type | Synthetic, biobased, cellulosic, bioplastic, petroleum-based |
| Raw ingredients | Polymers, resins, monomers, hydrocarbons, olefins, polyolefins, butadiene, styrene monomer, organic polymers, petrochemicals, natural gas, petroleum, coal, naphtha, carbohydrates, starch, vegetable fats, oils, bacteria, biological substances, corn, cotton derivatives, cellulose, softwood trees, biomass, animal waste |
| Plastic production process | Extraction, refining, polymerization, mixing, distillation, cracking, polymerisation, condensation polymerisation |
| Plastic product | Thermoplastics, elastomers, thermoset polymers, PVC, polyethylene, polypropylene, nylon, polyester, polyurethane, ABS |
| Plastic quality | Purity, performance, durability, strength, clarity |
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What You'll Learn
Fossil fuels
Natural gas and petroleum contain hydrocarbons, which are the building blocks of plastic. The hydrocarbons in natural gas and petroleum are converted into simpler molecules through a process called
One of the most important monomers in plastic production is ethylene, which is a gaseous hydrocarbon. When ethylene is subjected to heat, pressure, and a catalyst, it joins together into long, repeating carbon chains. These carbon chains are called polymers, and they are the main component of plastic. The polymer created from ethylene is called polyethylene, which is a type of plastic that is commonly used in many products.
In addition to natural gas and petroleum, other fossil fuels such as coal can also be used to create plastics. Coal can be converted into ethylene and propylene, which are also monomers used in plastic production. However, the use of coal in plastic manufacturing is less common due to anti-deforestation laws and the low cost of conventional plastics.
Overall, fossil fuels are the main raw ingredients for plastic production, and they undergo various chemical processes to create the final plastic product. The use of fossil fuels in plastic manufacturing has led to an increasing global focus on creating a circular economy for plastics, where plastics are processed, used, reused, collected, and recycled to reduce waste.
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Renewable materials
Plastic is typically derived from synthetic, non-renewable sources such as crude oil, natural gas, or coal. However, the demand for limited oil reserves has led to the development of renewable alternatives, known as bioplastics. These bioplastics are derived from biomass, animal waste, and plant sources such as castor beans, soy, corn starch, sugarcane, cellulose, and wood fibres.
Bioplastics are designed to address environmental concerns associated with conventional plastics, including pollution and the reliance on fossil fuels. They often have a reduced carbon footprint, with lower greenhouse gas emissions during production compared to fossil fuel-based plastics. Additionally, many bioplastics are biodegradable, naturally decomposing under certain conditions and reducing waste in landfills.
One example of a bioplastic is Nylon 11 (PA11), an engineering-grade bio-renewable plastic made from castor beans. It exhibits exceptional chemical resistance, good dimensional stability, and low density. Another example is Cellulose Acetate, a naturally derived plastic from plant cellulose or wood fibre, used in items like toothbrushes due to its cosmetic appearance and chemical resistance.
While bioplastics are generally considered more eco-friendly, a 2010 study from the University of Pittsburgh found that their production resulted in greater amounts of pollutants due to the use of fertilizers and pesticides in agriculture and the chemical processing required to turn organic material into plastic. The study also noted that bioplastics contributed more to ozone depletion and required extensive land use.
Despite these drawbacks, the concept of bioplastics remains significant as it strives to meet modern-day needs while minimizing environmental hazards. With further research and advancements, bioplastics have the potential to become more sustainable and widely adopted.
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Polymers and resins
Plastic is derived from a variety of raw materials, including polymers and resins. Polymers are large molecules formed by linking chains of smaller molecules called monomers. This process is known as polymerization, where small molecules merge to form a chain-like structure. Most plastics contain organic polymers, with chains of carbon atoms, sometimes combined with oxygen, nitrogen, or sulfur.
The monomers commonly used in plastic production include ethylene, propylene, butene, and others. Ethylene, for instance, is a gaseous hydrocarbon that, when subjected to heat, pressure, and a catalyst, forms long chains of carbon atoms, creating polyethylene (PE), a type of plastic resin. Polyethylene is then processed in factories to produce plastic pellets, which can be molded into various products.
Resins are thick, viscous substances generated during the polymerization process. They serve as the base material for creating plastic products. One notable example is polyethylene, which is a plastic resin formed from the polymerization of ethylene monomers.
The raw materials used in plastic production are primarily derived from natural resources or synthetic sources. Natural sources include cellulose, coal, natural gas, salt, and crude oil. Synthetic plastics, on the other hand, are typically derived from fossil fuel-based petrochemicals, such as natural gas, petroleum, or crude oil.
However, there is a growing trend towards using renewable and biodegradable materials in plastic manufacturing. These alternative sources include corn or cotton derivatives, carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances. By employing these sustainable raw materials, manufacturers can create plastics that are more environmentally friendly and contribute to a circular economy.
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Synthetic vs biobased
Plastic is a versatile element that has become a crucial part of modern life, used in everything from packaging to automotive areas. It can be made from synthetic or biobased sources.
Synthetic Plastic
Most modern plastics are synthetic and come from fossil fuel-based petrochemicals such as crude oil, natural gas, or coal. Synthetic plastics are most often made with petroleum, which is used to create synthetic organic polymers. These polymers are derived from oil or natural gas and are used in almost every aspect of modern society, including homes, workplaces, and automobiles. The raw materials used by the petrochemical industry are mainly naphtha and natural gas from oil refining operations.
Biobased Plastic
Biobased plastics, also known as bioplastics, are derived from renewable products such as carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances. Bioplastics are produced from renewable biomass sources, such as corn starch, straw, woodchips, and recycled food waste. They can also be made from softwood trees, where the tree bark is used as an energy source in the production process.
Benefits of Synthetic Plastic
Synthetic plastics are widely used due to the ease of manufacturing methods involved in the processing of crude oil. They are also more readily available and affordable than biobased plastics.
Benefits of Biobased Plastic
Biobased plastics offer a more sustainable solution to conventional plastics and are particularly valuable for food service packaging where compostability is a key requirement. Bioplastics can have a lower carbon footprint than fossil-based plastics and can be compatible with existing recycling streams. They also contribute to a circular economy, where virgin polymers are made from renewable or recycled raw materials, and carbon-neutral energy is used for production.
Limitations of Biobased Plastic
Biobased plastics have some limitations, including negative agricultural impacts, competition with food production, unclear end-of-life management, and higher costs. Additionally, the growth of the bioplastics business is hindered by anti-deforestation laws and the low cost of conventional plastics.
Toxicity
It is important to note that both synthetic and biobased plastics can contain toxic chemicals. While bioplastics are marketed as a sustainable alternative, little is known about the chemicals they contain and the safety of these compounds. Studies have shown that bioplastics can induce baseline toxicity, oxidative stress, and antiandrogenicity. However, further research is needed to fully understand the chemical safety of all types of plastics.
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Cracking hydrocarbons
Plastic is a synthetic or artificial polymer resembling natural resins found in trees and other plants. Most modern plastics are derived from fossil fuels, such as natural gas, petroleum, or crude oil.
The process of converting crude oil into plastic involves several steps, one of which is hydrocarbon cracking. Hydrocarbon cracking is a process in petroleum refining where heavy hydrocarbon molecules are broken down into simpler, lighter molecules through the use of heat and pressure, and sometimes catalysts. This process is essential for the commercial production of gasoline and diesel fuel.
There are two main types of hydrocarbon cracking: steam cracking and catalytic cracking. Steam cracking involves high temperatures and pressures to break the hydrocarbons' long chains without a catalyst. On the other hand, catalytic cracking adds a catalyst, allowing the process to occur at lower temperatures and pressures. This process is more energy-efficient and reduces the yield of undesirable, unstable alkenes.
During hydrocarbon cracking, the feedstock, such as naphtha, liquefied petroleum gas (LPG), ethane, propane, or butane, is heated to very high temperatures of around 800°C to 850°C. This high temperature causes the feedstock to break down into lighter hydrocarbons, such as ethylene, propylene, and butylene. These lighter hydrocarbons are crucial monomers that serve as building blocks for the polymerization process that follows, ultimately leading to the formation of plastic resins.
The choice of cracking method and the specific conditions used, such as temperature and pressure, depend on the desired end product. For example, a higher cracking temperature favors the production of ethylene and benzene, while lower temperatures produce higher amounts of propylene and C4-hydrocarbons.
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Frequently asked questions
Plastic is made from raw materials such as polymers and resins. These are derived from fossil fuels, including natural gas, crude oil, and coal.
Polymers are complex organic compounds produced by polymerisation, where small molecules merge to form large chain-like molecules. Resins are thick, viscous substances produced by the polymerisation process.
Yes, plastics can be categorised as synthetic or biobased. Synthetic plastics are derived from fossil fuels, while biobased plastics come from renewable sources such as carbohydrates, starch, vegetable fats, oils, and bacteria.
