Alexei Volkov
Plastic is everywhere, from our morning coffee cups to our smartphones. But what are the raw materials behind this ubiquitous product? Plastics are synthetic or semi-synthetic materials composed primarily of polymers, which are long chains of chemical compounds. These polymers are constructed from smaller pieces called monomers, which are derived from a variety of sources. The most common monomer is ethylene, which is typically obtained from natural gas or crude oil. Other monomers include propylene, vinyl chloride, and styrene, each with its own unique applications and characteristics. The manufacturing of plastic is a complex, multi-stage process that requires precision and expertise to produce quality, durable products. While most plastics are produced from fossil fuel-based petrochemicals, a growing minority are made from renewable resources, such as corn or cotton derivatives, reducing our reliance on fossil fuels.
| Characteristics | Values |
|---|---|
| Composition | Synthetic or semisynthetic materials composed primarily of polymers |
| Source | Fossil fuel-based petrochemicals such as natural gas, petroleum, or crude oil |
| Renewable Sources | Corn, cotton, or other plant derivatives, such as cellulose from softwood trees |
| Additives | Pigments, glass fiber, plasticizers, or Masterbatch granules for colour |
| Manufacturing Process | Injection moulding, blow moulding, extrusion, casting, or drawing into filaments |
| Properties | Lightweight, durable, flexible, chemical resistance, low toxicity, low cost |
| Global Production | Asia, particularly China, is the largest producer, accounting for 31% in 2020 |
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Fossil fuels, natural gas and petroleum
Fossil fuels, natural gas, and petroleum are the most common raw materials used to create plastic. Plastic is a synthetic or artificial polymer that resembles natural resins found in trees and other plants. Most plastics contain organic polymers, which are made up of chains of carbon atoms, either pure or with oxygen, nitrogen, or sulfur.
The process of creating plastic from fossil fuels involves extracting and refining crude oil, natural gas, and coal, which are then processed into different petroleum products. One of the crucial compounds obtained from this process is naphtha, which is used to make a large amount of plastic. The refining process converts crude oil into "monomers," which are the basic building blocks of polymers. These monomers are then converted into higher molecular weight hydrocarbons (polymers) through a process called polymerization.
Natural gas and petroleum are also important feedstocks for the petrochemical industry, which uses steam cracking to produce reactant gases such as ethane, propane, or butane, and liquids such as naphtha or gas oil. These feedstocks are derived from natural gas processing and crude oil refining. Ethylene, propylene, and butylene are important monomers obtained from this process, which are used to produce various plastics.
Additionally, coal has remained a valuable resource for producing plastics, particularly through the Advanced Methanol-to-Olefins (MTO) technology. This process uses coal and natural gas to create ethylene and propylene, which are commonly found in many plastics today.
While fossil fuels are the predominant source of raw materials for plastic production, recent manufacturing processes have started to utilize renewable alternatives such as corn or cotton derivatives, as well as cellulose from softwood trees, to reduce the reliance on fossil fuels and promote more environmentally friendly practices.
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Renewable resources
Plastic is a synthetic or artificial polymer resembling natural resins found in trees and other plants. Most modern plastics are derived from fossil fuel-based petrochemicals such as natural gas or petroleum. However, recent manufacturing processes have started using alternatives made from renewable resources such as corn, cotton, or other biomass derivatives. These bioplastics are designed to address environmental concerns associated with conventional plastics, including pollution and reliance on fossil fuels.
Bioplastics are derived from renewable biological sources, such as plants, rather than traditional petroleum-based plastics. They are made from natural materials like corn starch, sugarcane, or cellulose. These materials are used as substitutes for fossil fuel resources to produce bioplastics, making the production process more sustainable. Starch-based bioplastics, for example, are blended with biodegradable polyesters to create compostable products. Other renewable resources used to make bioplastics include wood, sugar, and biomass.
Bioplastics are also called drop-in bioplastics, which are chemically identical to their fossil-fuel counterparts but are made from renewable resources. Examples include bio-PE, bio-PET, bio-propylene, bio-PP, and bio-based nylons. These bioplastics are easy to implement technically, as existing infrastructure can be used.
Bioplastics can be produced using renewable energy, which has been shown to substantially reduce greenhouse gas emissions. For instance, a 2017 study found that switching from traditional plastic to corn-based PLA would cut US greenhouse gas emissions by 25%. Additionally, bioplastics generally require less energy to produce compared to conventional plastics, further reducing their environmental impact.
Bioplastics have a smaller carbon footprint than traditional plastics and decompose faster. They are also less toxic and do not contain bisphenol A (BPA), a hormone disruptor often found in traditional plastics. However, the environmental impact of bioplastics is often debated, as there are various metrics for "greenness," such as water use, energy use, deforestation, and biodegradation. While bioplastics reduce greenhouse gas emissions and non-renewable energy consumption, they can also increase eutrophication, algal blooms, and acidification due to the use of chemical fertilizers in cultivating renewable raw materials.
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Coal
Plastic is typically derived from petroleum, specifically crude oil, but can also be made from coal, natural gas, and salt. Coal, for example, can be used as a raw material in the creation of plastic, and this process can be outlined in several steps.
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Cellulose
Plastic is a versatile element that has become a crucial part of modern life, used in everything from packaging to automotive areas. Plastic raw materials are the chemical compounds that form long chains known as polymers, constructed from smaller pieces called monomers. Most modern plastics come from fossil fuel-based petrochemicals such as natural gas or petroleum. However, the most recent plastic manufacturing processes use alternatives manufactured from renewable materials such as corn or cotton derivatives.
Bioplastics can utilize previously unused waste materials (e.g., straw, woodchips, sawdust, and food waste). Life cycle analysis studies show that some bioplastics can be made with a lower carbon footprint than their fossil counterparts, for example when biomass is used as raw material and also for energy production. However, other bioplastics' processes are less efficient and result in a higher carbon footprint than fossil plastics.
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Crude oil
The first step in converting crude oil into plastic is crude oil oxidation, where the oil is transformed into gases and light petroleum products. Next, these gases are converted into monomer materials, which are the building blocks of polymers. The monomers then undergo polymerization, where they react with each other to form long polymer chains. Finally, the polymers are molded into various plastic products.
In addition to crude oil, natural gas is another fossil fuel feedstock commonly used in plastic production. The choice between using crude oil or natural gas depends on various factors, including regional differences, user demand, and the price of feedstocks. Asia, particularly China, has emerged as a significant producer of plastics, with lower raw material costs contributing to this shift.
While fossil fuels like crude oil and natural gas have dominated plastic production, there is a growing trend towards using renewable resources. These alternatives, such as corn or cotton derivatives, aim to reduce the reliance on fossil fuels and promote more environmentally friendly plastic production.
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Frequently asked questions
Plastic raw materials are the chemical compounds that form long chains known as polymers, constructed from smaller pieces called monomers.
Some examples of plastic raw materials include ethylene, propylene, vinyl chloride, and styrene. These monomers are used to produce common plastics such as polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC).
Polymers are long chains of molecules formed by the polymerization of monomers. They are important because they give plastics their defining characteristic of plasticity, allowing them to be molded, extruded, or pressed into various solid forms.
Plastic raw materials are typically derived from crude oil through processes such as distillation, cracking, and polymerization. Crude oil is extracted from mines and sent to refineries, where it undergoes various refining processes to become plastic raw materials.
