Maya Ellison
Plastic is everywhere, but where does it come from? Plastic can be synthetic or biobased. Synthetic plastics, which make up the majority of plastic in use today, are derived from fossil fuels such as crude oil, natural gas, and coal. Crude oil is a complex mixture of thousands of compounds that need to be processed before they can be used to create plastic. This processing involves the distillation of crude oil into lighter components called fractions, one of which, naphtha, is crucial for plastic production. These fractions are then linked together into long molecular chains called polymers, which are the basic building blocks of plastic.
| Characteristics | Values |
|---|---|
| What plastic is made from | Synthetic plastics are derived from crude oil, natural gas, or coal. Biobased plastics come from renewable products such as carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances. |
| How plastic is made | Crude oil is distilled in an oil refinery, separating it into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production. The two main processes for producing plastics are polymerization and polycondensation. |
| Why plastic doesn't biodegrade | Plastic comes from oil and gas, which originate from plants and other living organisms. However, it doesn't biodegrade because it takes thousands of years to break down completely. |
| Environmental impact | The production and use of plastic contribute to climate change and create waste that pollutes the environment. |
| Alternatives | Bioplastics are being developed from materials such as bacteria, natural rubber, and coffee ground oil. |
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What You'll Learn
Crude oil is a fossil fuel
Crude oil is a non-renewable resource and is a major source of raw material for various industries, including plastic production. The process of extracting and refining crude oil can have detrimental environmental impacts, contributing to climate change and pollution. The demand for oil and gas reserves for plastic production drives the exploration and extraction of these finite resources.
In the context of plastic production, crude oil undergoes distillation in an oil refinery, separating it into lighter components called fractions. One of the crucial fractions is naphtha, a mixture of volatile hydrocarbons. Naphtha is further processed at high temperatures in a steam cracker, breaking down into smaller hydrocarbons called olefins (such as ethylene and propylene) and aromatics (such as benzene, toluene, and xylene). These small molecules are then linked together to form long molecular chains called polymers, which serve as the foundation for plastic manufacturing.
The production of plastics from crude oil involves two main processes: polymerisation and polycondensation. These processes require specific catalysts and result in the creation of synthetic plastics. Synthetic plastics are the most commonly used type due to the ease of manufacturing methods associated with processing crude oil. However, the environmental implications of using crude oil, a fossil fuel, for plastic production have spurred the development of alternative approaches, such as bioplastics derived from renewable sources.
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Plastic is made from hydrocarbons
The process of extracting crude oil involves drilling holes through rocks and pumping the oil to the surface, where it is transported to refineries via pipelines or tankers. Oil drilling can also take place under the ocean using platforms for support. The refining process involves separating crude oil into groups of lighter components called fractions, each containing hydrocarbon chains of varying molecular sizes and structures. One of these fractions, naphtha, is a crucial compound for plastic production.
Naphtha is a volatile mixture of liquid hydrocarbons obtained by distilling crude oil. When heated to high temperatures of around 800°C in a steam cracker, naphtha decomposes into light hydrocarbons called olefins (such as ethylene and propylene) and aromatics (such as benzene, toluene, and xylene). These small molecules are then linked together to form long molecular chains called polymers, which are the basis for plastic.
The polymerisation process involves converting light olefin gases (monomers) into higher molecular weight hydrocarbons (polymers) through chemical bonding. This can occur through addition polymerisation, where monomers are added one by one with the help of a catalyst, or condensation polymerisation, where two or more monomers are joined by removing small molecules like water. The resulting polymers possess "plasticity," the property that allows them to deform irreversibly without breaking, making them ideal for various applications.
While most plastic today is synthetic, derived from crude oil, natural gas, or coal, there is a growing demand for biobased plastics made from renewable sources like carbohydrates, starch, vegetable fats, oils, and bacteria. Synthetic plastics have dominated the market due to the ease of manufacturing methods associated with processing crude oil. However, the limited oil reserves and environmental concerns are driving the need for newer, renewable sources for plastic production.
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Crude oil is distilled to make plastic
Crude oil is a fossil fuel, formed from the remains of living organisms like algae, bacteria, and plants. These organisms were buried deep underground for millions of years, where they were subjected to immense heat and pressure, transforming them into oil and gas. Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used.
The first step in the transformation of crude oil into plastic is distillation. Crude oil is distilled in an oil refinery, where it is heated at extremely high temperatures of around 800°C. This process separates the heavy crude oil into lighter components called fractions. Each fraction is a mixture of hydrocarbon chains, which are chemical compounds made up of carbon and hydrogen. These chains differ in terms of the size and structure of their molecules.
One of the crucial fractions obtained from the distillation of crude oil is naphtha, a mixture of volatile hydrocarbons. Naphtha is further decomposed at high temperatures in the presence of water vapour, splitting into light hydrocarbons called olefins (such as ethylene and propylene) and aromatics (such as benzene, toluene, and xylene). These small molecules are then linked together to form long molecular chains called polymers. Polymers are the fundamental building blocks of plastics.
However, it is important to note that crude oil is not the primary source of feedstock for plastic production in the United States. Instead, natural gas and feedstocks derived from natural gas processing and crude oil refining are more commonly used. The specific amounts and origins of these feedstocks used in plastic manufacturing are challenging to determine due to the flexibility of the petrochemical industry.
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Natural gas and coal are also used
Plastic is derived from crude oil, natural gas, and coal, which are all fossil fuels. Natural gas and coal are also used to make plastic products. Natural gas, in particular, is a significant feedstock for plastic production in the United States, where the U.S. Energy Information Administration (EIA) reported that in 2010, about 412 billion cubic feet of natural gas were used to make plastic products.
Natural gas is a fossil fuel composed primarily of methane, which is a simple hydrocarbon with the chemical formula CH4. It also contains other hydrocarbons such as ethane, which has the chemical formula C2H6. Natural gas is formed from the remains of living organisms, primarily tiny plants and animals called plankton, that existed during the Jurassic era. Over millions of years, these organic materials were subjected to intense heat and pressure, transforming them into the natural gas we extract today.
To turn natural gas into plastic, it undergoes a process known as "cracking." One of the key steps in this process involves heating ethane, a component of natural gas, to around 1,500 degrees Fahrenheit. This high temperature breaks the carbon-carbon bonds in ethane, resulting in the formation of ethylene. Ethylene, with its double bond, is highly reactive and can easily combine with other chemicals to form long molecular chains. These chains of ethylene molecules create polyethylene, a common type of plastic found in various everyday products, from milk containers to medical devices.
Coal, another fossil fuel, also originates from ancient plants that underwent similar geological processes as crude oil and natural gas. However, coal is not commonly used as a feedstock for plastic production. The process of converting coal into plastic-making feedstocks is more complex and less economically viable than using crude oil or natural gas. Nevertheless, coal can be a potential source of feedstocks for plastic production, especially with advancements in coal-to-liquids technology.
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Crude oil is a non-renewable resource
The process of forming crude oil begins with the burial of organic material, such as plankton, tiny plants, and animals, under heavy layers of sediment and Earth's mantle. The combination of immense heat and pressure from compression causes the organic matter to decompose without oxygen, transforming into small pockets of oil and gas. This crude oil and natural gas then penetrate rocks and accumulate in reservoirs, often found at the bottom of oceans and beneath the Earth's surface.
Crude oil is a significant non-renewable resource as it is used to create a variety of products essential for modern life. After being pumped out and refined, crude oil is utilized to produce gasoline and diesel for motor vehicles, plastics, heating oil, propane, jet fuel, and even artificial food flavors. However, the consumption of crude oil contributes to environmental concerns. The extraction process often results in oil spills and the release of hazardous materials, polluting the environment. Additionally, burning fossil fuels releases carbon dioxide into the atmosphere, contributing to global warming and climate change.
As a non-renewable resource, the availability of crude oil is limited. Scientists predict that current oil reserves may not last beyond the middle of the 21st century due to the rapid rate of consumption. This realization has led to a growing demand for newer plastics derived from renewable resources, such as waste biomass or animal-waste products. While most plastic today is still synthetic and derived from crude oil, the search for alternative sources is becoming increasingly urgent.
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Frequently asked questions
Yes, plastic is derived from crude oil, natural gas, and coal.
Plastic is made from hydrocarbons, which are molecules of hydrogen and carbon.
Hydrocarbons are fossil fuels derived from the remains of living organisms such as algae, bacteria, tiny plants, and animals.
Biobased plastics are made from renewable products such as carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances.
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