Alexei Volkov
Plastic is everywhere, and it's made from oil—but not all plastic is made from oil. Plastic can be synthetic or biobased. Synthetic plastics are derived from crude oil, natural gas, or coal, while biobased plastics are made from renewable products like carbohydrates, starch, vegetable fats and oils, and bacteria. The majority of plastic in use today is synthetic because it's easier to manufacture when processing crude oil. However, the demand for limited oil reserves is driving the need for newer plastics made from renewable resources. In the US, oil is used to make plastic bags, fertilizers, diesel, and gasoline.
| Characteristics | Values |
|---|---|
| Are all plastic products derived from oil? | No, plastic products can be derived from crude oil, natural gas, or coal. |
| What is crude oil? | Crude oil is a complex mixture of thousands of compounds that pools in high-pressure chambers within the Earth's crust and is made up of hydrocarbons, compounds made from combinations of carbon and hydrogen atoms that form chains of varying lengths. |
| How is crude oil processed to make plastic? | Crude oil is drilled, pumped to the surface, and carried through pipelines to oil refineries. The distillation step separates the heavy crude oil into groups of lighter components, called fractions. Each fraction is a mixture of hydrocarbon chains. The cracking process then breaks down the mixture of complex hydrocarbons into simpler molecules. |
| What are the types of cracking processes? | Steam cracking and catalytic cracking. Steam cracking uses high temperature and pressure to break the hydrocarbons long chains without a catalyst, while catalytic cracking adds a catalyst to allow the process to occur at lower temperatures and pressures. |
| What are the products of the cracking process? | Monomers such as ethylene and propylene, which can be formed into long polymer chains through polymerization. |
| What are some examples of plastics derived from oil? | Polyethylene, polypropylene, and PET (polyethylene terephthalate). |
| Are there alternative sources for making plastics? | Yes, there are alternative bio-plastics such as PLA and PHA, which are made from renewable biomass, vegetable matter, or waste products. |
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What You'll Learn
- Crude oil is the principal source of carbon for modern plastic
- Plastic made without oil is marketed as biobased plastic or bioplastics
- Synthetic plastics are derived from natural gas or coal
- The US uses 12 million barrels of oil to produce plastic bags
- Plastic is made by isolating, breaking down, and reconstituting hydrocarbons
Crude oil is the principal source of carbon for modern plastic
Crude oil is indeed the principal source of carbon for modern plastic. However, it is not the only source, and there are alternative bio-plastics made from renewable biomass.
Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used to make plastic. The production of plastics begins with the distillation of crude oil in an oil refinery. This separates the heavy crude oil into groups of lighter components, called fractions. Each fraction is a mixture of hydrocarbon chains (chemical compounds made up of carbon and hydrogen), which differ in terms of the size and structure of their molecules. One of these fractions, naphtha, is the crucial compound for the production of plastics.
The next step in the process is to break down these hydrocarbon chains into smaller units. This can be done through a process called steam cracking, which uses high temperatures and pressures in a zero-oxygen environment to break down the hydrocarbons into shorter molecules called monomers. Monomers such as ethylene and propylene can be derived from naphtha after thermal cracking.
The final step in the process is called polymerisation, in which simple molecules like ethylene and propylene are chemically bonded into long chains called polymers. Plastic is essentially a long chain of polymer molecules. Different blends of materials can be combined, melted, and blended to create different types of plastic.
While crude oil is the most common source of carbon for plastic, it is not the only source. Synthetic plastics can also be derived from natural gas and coal. Additionally, bio-based plastics are made from renewable products such as carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances. However, it is important to note that bio-based plastics may not be a more sustainable alternative in all cases, as they require resources in their production and may not biodegrade in all climates.
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Plastic made without oil is marketed as biobased plastic or bioplastics
Plastic is typically derived from crude oil, natural gas, or coal. However, with growing concerns about the environmental impact of fossil fuels and the finite nature of oil reserves, there is a demand for plastic made without oil. This type of plastic is known as biobased plastic or bioplastics and is made from renewable biomass sources.
Bioplastics are derived from various renewable materials, including carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances. For example, scientists have discovered that some bacteria produce ethylene, a chemical that can be valuable in manufacturing. Another example is the Sorona polymer, a polymer made from glucose using a genetically modified strain of E. coli.
Biobased plastics can also be made from methanol, which can be derived from solid biomass, including waste streams from forests and agriculture, such as trees and plants. Methanol-based plastics have lower emissions than conventional oil and gas-based plastics when the carbon emissions from the methanol plant are captured and stored through carbon capture and storage (CCS) technology.
While biobased plastics offer a promising alternative to fossil fuel-based plastics, it is important to note that they are not automatically a more sustainable option. Bioplastics differ in the ways they break down, and they require resources for their production. For example, bioplastics like PLA are biodegradable but may not degrade in all climates, requiring a separate waste stream for proper disposal.
In summary, plastic made without oil, marketed as biobased plastic or bioplastics, is derived from renewable biomass sources and offers a potential solution to the environmental and resource concerns associated with traditional fossil fuel-based plastics. However, it is essential to consider the specific characteristics and life cycle of these alternative plastics to ensure they provide a truly sustainable alternative.
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Synthetic plastics are derived from natural gas or coal
Plastic is a synthetic substance derived from natural gas, coal, or crude oil. Synthetic plastics are derived from natural gas or coal, while bio-based plastics are derived from renewable sources such as carbohydrates, starch, vegetable fats and oils, and bacteria. The vast majority of plastic in use today is synthetic due to the ease of manufacturing methods involved in processing crude oil. However, the demand for limited oil reserves is driving the need for newer plastics made from renewable resources.
Crude oil, natural gas, and coal are fossil fuels composed primarily of hydrocarbons, carbon, hydrogen, nitrogen, sulphur, oxygen, and other minerals. These fossil fuels are formed from the remains of living organisms, primarily plankton, that existed during the Jurassic era. Over time, these dead organisms decomposed without oxygen and transformed into tiny pockets of oil and gas. Crude oil and natural gas are found in reservoirs at the bottom of oceans, while coal is derived mainly from dead plants.
The process of creating plastic from crude oil involves several steps. Firstly, the extraction of raw materials, primarily crude oil and natural gas, but also coal, yields a complex mixture of compounds. The refining process then transforms the crude oil into different petroleum products, including "monomers," which are the basic building blocks of polymers. One crucial compound in this process is naphtha, which is used to make a large amount of plastic.
Natural gas, composed primarily of methane, has gained prominence over coal as an energy source, reducing carbon emissions. While most natural gas is used for electricity generation, heating, and cooking, a small percentage is converted into chemicals used in plastics, adhesives, and other consumer products. Chemical engineers are working to develop more efficient and cost-effective strategies for converting methane into these commodity chemicals, further reducing carbon emissions.
The process of converting methane into plastics involves using catalysts to trigger chemical reactions. While an initial reaction may only convert 25% of methane into a building block for plastics, such as ethylene, multiple separation and recovery loops can increase the overall methane conversion rate to over 75%. The development of more selective catalysts and improved catalysis techniques will enable a greater percentage of natural gas to be used as feedstock for commodity chemicals.
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The US uses 12 million barrels of oil to produce plastic bags
Plastic products are mostly synthetic, derived from crude oil, natural gas, or coal. In the process of making plastic, petroleum is decomposed into petroleum gas, gasoline, paraffin, naphtha, light oil, and heavy oil, among others. The long-chain hydrocarbons obtained are then converted into simpler hydrocarbons that can be used to prepare a wide range of products, including plastic. This process is called hydrocarbon cracking and can be done through steam cracking or catalytic cracking.
While crude oil is the principal source of carbon for modern plastic, biobased plastics are also manufactured from renewable materials such as biomass, carbohydrates, starch, vegetable fats and oils, and bacteria. However, bioplastics are not always a more sustainable alternative, as they differ in the ways they break down and still require resources for production.
The US uses approximately 12 million barrels of oil annually to produce plastic bags, according to a 2019 statement by then-governor Andrew Cuomo. This amounts to about 8-10% of the country's total oil supply. The average American throws away about 10 plastic bags per week, which is about 520 bags per year. In total, the US discards a staggering 100 billion plastic bags annually.
The US Energy Information Administration (EIA) cannot determine the precise amounts or origins of the feedstocks used in plastic manufacturing. However, they have identified oil-derived feedstocks specifically designated for petrochemical crackers, which produce the building blocks for plastics. The flexibility in the feedstock consumed by the petrochemical industry also makes it challenging to pinpoint the exact amounts and sources of materials used in plastic production.
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Plastic is made by isolating, breaking down, and reconstituting hydrocarbons
Plastic is a synthetic material derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Crude oil, a fossil fuel, is a mixture of thousands of compounds, including hydrocarbons, which are compounds made from combinations of carbon and hydrogen atoms that form chains of varying lengths, giving them different properties. These hydrocarbons are the earliest raw materials of plastic, and they are ready-made by the Earth.
The process of making plastic from these hydrocarbons involves isolating the hydrocarbons, breaking them down, and then reconstituting them into entirely new formations. This is done through a process called cracking, which breaks down the mixture of complex hydrocarbons into simpler low relative molecular mass alkenes/alkanes through the use of high temperature and pressure. There are two types of cracking: steam cracking and catalytic cracking. Steam cracking uses high temperature and pressure to break the hydrocarbons' long chains without a catalyst, while catalytic cracking uses a catalyst to allow the process to occur at lower temperatures and pressures.
The monomers that result from the cracking process are then linked together to form long polymer chains through a process called polymerization. Different elements, types of monomers, and rearrangements of these monomers in different patterns can be used to change the shape of the polymer, its molecular weight, or other chemical/physical properties. This allows plastics to be designed with the right properties for specific applications, such as food packaging, which contains additives to deter the passage of excess oxygen or sunlight to avoid degradation.
While most plastic in use today is synthetic and derived from crude oil, there are also biobased plastics made from renewable products such as carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances. These biobased plastics, also known as bioplastics, are not necessarily a more sustainable alternative, as they differ in the ways in which they break down and still require resources in their production.
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Frequently asked questions
No, not all plastic products come from oil. Plastic can either be synthetic or biobased. Synthetic plastics are derived from crude oil, natural gas, or coal. Biobased plastics, on the other hand, are made from renewable products like carbohydrates, starch, vegetable fats and oils, bacteria, and other biological substances.
Synthetic plastics are made from oil through a process called steam cracking, which breaks down naphtha into smaller components. These components are then bonded into new, long molecular chains called polymers, which are the foundation of plastic products.
While biobased plastics are made from renewable sources, they are not always a more sustainable alternative. For example, bioplastics like PLA are biodegradable in certain environmental conditions but may not break down in all climates. Additionally, they can contaminate the existing plastic recycling stream during the recycling process.
